Contents - University of New South Wales
Contents
1. 000000 adidas 10 4 7 OXIDISING SUBSTANC O lt a A A eh eee ite 11 4 8 GOMPRESSED GASES ee a Hee Aerts AER e Ee 11 4 9 EIQUIBDINEEROGEN cuartos neta ta i ee a et i eed me oe Raita ed mas hg ieee 11 4 10 TOXIG GHEMIGALS a aise eel ated HONG it ie dk ee ack eee 12 4 11 SPILLAGE hf eset ae ar ate Ane tat ohana EE EE 14 4 12 WASTE DISP SA leit 8 srt ctiedes nt dm ted Weel ve BO BA als PAR AO A bh nel a 15 4 13 SHAR PS ee hae dt ice a Rea AS oh tore Ute aad A AR IM ta Blk tS oo aM ht AD ta de 15 5 OVERVIEW OF SPECIMEN PREPARATION FOR ELECTRON MICROSCOPY 16 6 7 5 1 SCANNING ELECTRON MICROSCOPY incccccccccconcnononcnannccnncnono manana cnnnn nn cnn rca nn carr r anna nnnn ra nannccns 16 5 2 TRANSMISSION ELECTRON MICROSCOPY cniccccccccccconcnononanonnnnnnnnccnnnnnnnn narran 18 SPECIMEN PREPARATION EQUIPMENT ooocccccccccccnononnnnnnnnnncccnnnnnnnnnnnncnnnnncnnnnnnnns 21 6 1 INORGANIC SPECIMENS ccccccccceceeeeeceeeeecaeeeeaaeeeeeeeeceaeeeeaaeseeeeesaeeesaaeseeaaeseeeeeseaeeesaaeseeeeesaas 21 6 2 BIOLOGICAL POLYMER SPECIMENS ccccceceeeeeeeeeeeeeeeeeeeeeaaeeeceeeeseaeeesaaeseeeeeseeeesaeeeeeeeeaes 22 6 3 VARIOUS COATERS deg gege dee deefe E ege e 23 MICROSCOPES EE 24 7 1 TRANSMISSION SCANNING TRANSMISSION ELECTRON MICROSCOPES seen 24 7 1 1 Hitachi H 7000 TEM STEM OOg98 cee eeeeaeeeeaeeeseaeeesaaeeseaaeseeeeseaeeesaeeeeaeeseaes 24 7 1 2 Philips CM200 Field Emission TEM STEM 900 24 7 1 3 VG HB601UX Fiel2. burners are extinguished and hotplates and lamps are turned off 3 4 EQUIPMENT FAILURE Even the best equipment will give trouble from time to time and often it will not be your fault Minimise trouble and delay by IMMEDIATELY SEEKING HELP when anything seems to be broken faulty or not working as you expected UNSW Electron Microscope Unit Laboratory Handbook March 2005 EMU STAFF MUST BE ADVISED OF ANY PROBLEMS IMMEDIATELY DO NOT TRY TO FIX OR FORCE ANYTHING These rules not only protect the EMU equipment from damage done by unskilled attempts at repairs they also protect YOU from hazards associated with the equipment 3 5 SPECIMEN STORAGE There is limited space for storing specimens in the laboratories Take your specimens with you Any specimens or materials permitted to be left in the laboratory must be labelled with your name the date and a specimen identification Any unlabelled material left in the Unit will be thrown out immediately 3 6 PHOTOGRAPHIC NEGATIVES After processing negatives are stored in B007 If you do not collect them within a week they will be thrown out unless you advise us of any likely absence We recommend you to scan your negatives into the EMU computer system 3 7 DIGITAL IMAGES All the EMU microscopes are fitted with digitisers or CCD cameras that convert an image to a computer file The digitising is one function of the personal computer beside each microscope All the computers are networ
3. DS is to be performed on the specimen a carbon coating is preferable In general the carbon coating does not interfere with chemical analysis For metallic coatings gold is most commonly used and gives high quality images However for high resolution imaging greater than 50 000x the structure of the gold coating will start to become visible For specimens to be prepared for high resolution imaging chromium coating using a specialised high resolution coater is required Coatings can be applied by two processes sputtering and evaporation Overall for most applications the choice of process is not critical Either carbon or metal can be applied by either method Evaporation of gold for example involves the rapid heating of a short strip of gold wire in a chamber under vacuum The heating melts the gold which because of its rapid heating and the vacuum chamber disperses as a spray of droplets in all directions This results in a fine coating of gold over both the specimen and the inside of the vacuum chamber Sputtering involves the interaction of a high energy beam usually of an inert gas such as argon or xenon onto a target again under vacuum The atoms sputtered from the target then coating both the 16 UNSW Electron Microscope Unit Laboratory Handbook March 2005 specimen and the inside of the vacuum chamber For most coaters argon is used high resolution Coaters use xenon e g Xenosput Many metallurgical type speci
4. X ray elemental analyzer multi element mapping IXRF http www ixrfsystems com new html e accessories include a LN cold stage operating down to 77K and a tensile stage operating to 45 5Kg calibrated readout e live image can be recorded on videotape 24 UNSW Electron Microscope Unit Laboratory Handbook March 2005 7 2 2 JEOL 840 SEM 1986 The JEO L 840 is used for routine microstructural and microanalytical analysis of materials e Link AN 10000 X ray elemental analyzer e HKL Electron Backscattered Diffraction system Detailed procedures for use of its ancillary equipment Link EDS and HKL EBSD are found in their respective manuals Copies of these manuals are available from PRM 7 2 3 Hitachi S 900 Field Emission SEM 1991 The S 900 is the highest resolution SEM in the EMU e low voltage in lens field emission scanning electron microscope with hot and cold stages e capable of imaging at very high resolution 0 7 nanometres e in lens configuration limits specimen size to 5 x 10 x 2 5mm 7 2 4 Hitachi S 450011 Field Emission SEM 1996 The S 4500 is used for high resolution imaging and analysis e high resolution 1 5 nanometres below lens field emission scanning electron microscope with tilting stage e below lens configuration means that the specimen size limitation is not as stringent as for Hitachi S 900 SEM e Robinson Back Scatter Electron Detector e Link ISIS 200 Energy Dispersive X ray Microanalysis Sy
5. a fume hood SMOKING EATING AND DRINKING WHEN USING RESINS IS PARTICULARLY HAZARDOUS Tie long hair back so it cannot contact the resin and become contaminated A container for waste resin is provided in the fume cupboard Paper towels are available for cleaning Only disposable containers are to be used for resin Resin discards and resin contaminated disposables MU ST be polymerised prior to disposal Dispose all contaminated containers gloves and paper towels in the toxic waste garbage bin Persons handling waste should be informed that incineration might lead to the production of nitric acid hydrochloric acid cyanide and CO In the event of a spill on your skin WASH WELL WITH SOAP AND COLD WATER Wash hands well on removal of gloves Laboratory contamination Avoid leaving resin on handles of doors refrigerators balances forceps telephones etc Clean off any resin you accidentally transfer while working NEVER DISPOSE OF RESIN IN A SINK Waste must be disposed of in the jar in the fume cupboard Before consigning to the trash resin in beakers or pipettes must be polymerised for several days at 60 C 4 11 SPILLAGE In fume cupboard absorb with paper towelling remove final traces with acetone place contaminated towelling etc in a polythene bag for disposal For spills occurring In open laboratory bench floor etc 1 Inform a senior member of staff 2 Using respirator cover spillage with vermiculite allow time for a
6. below together with safety precautions required when using them The essential rules are e to avoid o ingestion o skin contact and o inhalation e Wear a laboratory coat gloves and goggles e Handle toxic and hazardous materials in the fume cupboard with the sash low GLUTARALDEHYDE AND FORMALDEHYDE These are toxic through contact and inhalation Skin contact can cause allergic dermatitis These are respiratory irritants and should ALWAYS be handled in a fume cupboard Wear LAB COAT LATEX GLOVES AND GOGGLES when handling the solutions Used fixative containing aldehydes should be discarded in a special discard container in the fume cupboard and NEVER down a sink Only Staff are to work with concentrated solutions to dilute them to working strength Undergraduates must not transport glutaraldehyde solutions outside the laboratory SODIUM CACODYLATE This is a very toxic salt containing arsenic a potent cumulative poison Prolonged exposure to dust and concentrated solutions is harmful Wipe up all spills Use concentrated solutions in a fume cupboard clean up all spills and WEAR GLOVES AT ALL TIMES Solutions containing cacodylate should be discarded in the Aldehyde special discard container OSMIUM TETROXIDE Solid osmium tetroxide its solutions AND ITS VAPOUR are extremely toxic They damage mucous membranes and cause irreversible damage to the cornea of the eyes Liver damage is caused if the osmium is ingested Only EMU
7. form with their name telephone numbers and University account number and give it to the EMU systems administrator Dong Ming Zheng He will also take a digital photo of you for the EMU database You will also need to provide a login name and password so you can use the Unit s computerised network booking and image management system accessible through any web browser A folder will be created on the EMU server for you to store your images etc Your login name will also be your folder name 2 3 RESTRICTED ACCESS Your access to the laboratory implies permission to use EMU facilities and operate equipment for which you have been trained and which are specific to your work You must NOT use any other facilities until you have received instruction in their use from a member of staff Only E M Unit staff may access certain parts of the laboratory e Any space behind any of the microscopes e The service corridor alongside the microscope rooms B003 e The liquid nitrogen store B023 e The stationery store B002 e Storage for toxic chemicals e The toxic chemical refrigerator User access to these areas is prohibited If you believe you need access or get anything from one of these places ask a staff member 2 4 INSTRUMENT BOOKINGS The Electron Microscope Bookings system is available on any personal computer in the Unit on the Campus W ide Network CWN and through the World Wide Web WWW Telephone bookings are not accepted The Uni
8. scrape body parts and includes hypodermic needles syringes lancets scalpel blades glass Pasteur pipettes microtome blades razor blades and other sharp contaminated sharp metal and glass laboratory waste materials All such items MUST be disposed of in the yellow plastic SHARPS BIN Needles and razor blade waste for disposal must not be placed into office garbage bags waste paper bins or any other type of plastic bags 15 UNSW Electron Microscope Unit Laboratory Handbook March 2005 5 OVERVIEW OF SPECIMEN PREPARATION FOR ELECTRON MICRO SCO PY No two materials or specimens are alike and so the methods used to prepare specimens for examination in the electron microscope will depend not only on the type of specimen that is to be examined but also the microscope to be used Every person has different specimens and it is strongly suggested that individual users develop their own methods and protocols for specimen preparation depending on their own specimens and the experiments they wish to perform In this section the principal methods of specimen preparation are outlined in rather broad terms However this should allow users to understand the decisions they will need to make in specimen preparation 5 1 SCANNING ELECTRON MICROSCO PY Specimens for SEM analysis are often described as bulk specimens They are typically 1 3cm in diameter and often require little or no pre preparation Different SEMs have different stage sizes t
9. staff are permitted to work with osmium tetroxide solid Osmium tetroxide in any form must be handled in a fume cupboard with the sash low Laboratory coat safety glasses and latex gloves MU ST be worn when handling osmium tetroxide in any form IMMEDIATELY REPORT ANY SPILLS TO A MEMBER OF STAFF Dispose of used solutions in the special osmium discard bottle in the fume cupboard LEAD AND URANIUM STAINS These are heavy metal poisons which are cumulatively toxic Clean up all spills and wash hands after use with soap and warm water The uranyl acetate we use is depleted and is only slightly radioactive The greatest risk is through inhalation of the powdered solid Wear gloves when handling the solid Avoid raising chemical dust Clean up all spills Avoid aerosols of the solution Store all the uranyl salts in the secure cabinet until wanted for use EPOXY RESINS 13 UNSW Electron Microscope Unit Laboratory Handbook March 2005 There are five major hazards associated with resins Carcinogenesis possibly ERL 4206 Primary irritancy Skin contact dermatitis which can be severe Systemic toxicity Environmental pollution Fire hazard most resins are flammable Ent The most commonly used epoxy resin used in the laboratory is the low viscosity resin devised by Spurr These reactive chemicals may seriously damage your health You must wear a laboratory coat goggles and gloves while handling them and you must work with them in
10. 5 2nd Edition Ellis Horwood New York Electron Micro Probe Analysis and Scanning Electron Microscopy in Geology SJB Reed 1996 2nd Edition ISBN 0 521 41956 5 Cambridge Univ Press Cambridge U K Electron Probe Q uantitation Heinrich K F J amp Newbury D E 1995 ISBN 0 306 43824 0 Plenum Press New York amp London Scanning and Transmission Electron Microscopy An Introduction Stanley L Flegler John W Heckman Jr Karen L Klomparens Oxford University Press 1993 Scanning Probe Microscopy Theory Techniques and Application ed D A Bonnell John Wiley amp Sons New York 2000 Scanning Tunneling Microscopy Theory Techniques and Application ed D A Bonnell VCH Publications N ew York 1993 Selected papers on scanning probe microscopes design and applications Yves Martin editor ISBN 0819418048 Bellingham Wash SPIE Optical Engineering Press 1995 Atomic force microscopy for biologists V J Morris A R Kirby A P Gunning London Imperial College Press 1999 ISBN 1860941990 Cathodoluminescence microscopy of inorganic solids B G Jacobi D B Holt 1990 ISBN 0306433141 New York Plenum Scanning Electron Microscopy Physics of Image Formation and Microanalysis 2nd Ed by Ludwig Reimer T Tamir Editor Springer Series in O ptical Sciences Vol 45 ISBN 3540639764 2nd edition 1998 AL Schawlow Editor Springer Verlag Transmission Electron Microscopy Physics o
11. 8 3 BOOKIREFERENCGE Ss E EA TE A aller li AE 28 8 4 MICROSCOPY JOURNALS r daaim entrene aa aa e erand did rat 31 UNSW EM Unit Laboratory Handbook revised March 2005 Next revision due in March 2006 unless otherwise required UNSW E M Unit Laboratory Handbook Revised March 2005 1 STAFFAND EQUIPMENT DIRECTO RY Margaret Budanovic 56392 m budanovic unsw edu au Delphine Chassaing 55581 d chassaing unsw edu au A E 56390 k levick unsw edu au Mr Post doctoral Damien McGrouther 55581 d mcgrouther unsw edu au Research Ass ie pee MS REN E r Barry Searle 56384 b searle unsw edu au PO gt Mr BarrySearle 56384 p searle unsw edu au i kalceff unsw edu au Po Mr Bong Ming Zheng 56680 dm zheng unsweduau Saison SSC First Aid O fficer 56390 k levick unsw edu au Safety O fficer Barry Searle 56384 b searle unsw edu au Floor Fire Emergency Warden Viera Piegerova 56389 viera unsw edu au Floor Fire Emergency W arden Jenny Norman 56391 j norman unsw edu au Enquiries emu enquiries unsw edu au UNSW Electron Microscope Unit Laboratory Handbook March 2005 2 USER INSTRUCTIONS AND ACCESS PRO CED URES 2 1 INTRODUCTION The Electron Microscope U nit at The University of New South Wales is well equipped with a versatile range of some of the finest microscopes in Australia The total value of the EMU equipment exceeds 10 million dollars The EMU policy is to e
12. M produces secondary electron images transmitted electron images e Electron beam accelerating voltages from 40 125 kV e Capable of 0 5nm Resolution e tilting stage cryo stage LN e Moran Kevex energy dispersive x ray analyser MegaView CCD Camera 7 1 2 Philips CM200 Field Emission TEM STEM 1999 The CM 200 is used for high resolution imaging and microanalysis e 200 keV maximum electron beam accelerating voltage e capable of 0 24 nm resolution e EDAX EDS detector chemical analysis from regions as small as 10 nm in diameter e Soft Imaging System CCD camera for direct recording of digital images Detailed procedures for use of its ancillary equipment EDAX EDS SIS CCD camera are found in their respective manuals Copies of these manuals are available from Paul Munroe 7 1 3 VG HB601UX Field Emission TEM STEM Installed at the University of Sydney The VG STEM is used for high resolution imaging and microanalysis e 100kV maximum electron beam accelerating voltage e bright field imaging capable of 0 22nm resolution e high resolution EDS profiles and mapping e Parallel Electron Energy Loss Spectroscopy PEELS See Paul Munroe for information about access and training 7 2 SCANNING ELECTRON MICROSCOPES 7 2 1 Cambridge S 360 SEM 1988 The S 360 is used for routine scanning electron microscopy and microanalysis e secondary electron backscattered electron Robinson specimen current and EBIC imaging modes are available e
13. P Please note that suitable protection lab coat latex gloves and eye protection etc is required when using this equipment 6 1 2 Buehler Diamond Saw for preliminary sectioning of metals and ceramics most usually for transmission electron microscope examination 6 1 3 Struers Setacom Precision Saw for sectioning materials as a preliminary step in specimen preparation 6 1 4 Gatan Ultrasonic Disc Grinder for production of 3mm discs prior to thinning 6 1 5 Precision Dimple Grinder for the pre thinning of 3mm discs prior to final thinning 6 1 6 Concept Electro Discharge Edm Machine for the preparation of 3mm discs from metallic samples prior to final thinning 6 1 7 Struers Tenupol 3 Electropolisher for the final thinning of TEM samples 6 1 8 Nitric Acid Methanol Electropolishing Solutions 21 UNSW Electron Microscope Unit Laboratory Handbook March 2005 One of the most commonly used electropolishing solutions is a mixture of nitric acid and methanol Typical solutions are either 20 nitric acid 80 methanol or 30 nitric acid 70 methanol Solutions are only to be prepared by Prof Paul Munroe or Ms Viera Piegerova Extreme care is required as the reaction between these liquids is strongly exothermic Once the solution has been prepared it should be stored in the appropriate storage cabinet when not in use Label the storage bottle properly Include your name and the date See the Unit s Safety Officer Barry Sear
14. Publishing 1992 ISBN 0 306 44175 6 The following list describes facilities provided in the E M Unit Prospective users must first be instructed by the appropriate staff Sigrid Fraser M argaret Budanovic Please note that suitable protection lab coat latex gloves and eye protection etc is required when using this equipment 6 2 2 Reichert Ultracut E Ultramicrotome for cutting thin sections of biological or polymer specimens 6 2 3 Reichert Ultracut E Cryo U Itramicrotome for cutting thin frozen sections of soft biological or polymer specimens 6 2 4 Bromma LKB 7800 Knifemaker 22 UNSW Electron Microscope Unit Laboratory Handbook March 2005 for making glass knives for microtomy Diamond knives are also available for special applications Diamond knives may only be used by staff See Margaret Budanovic or Sigrid Fraser 6 2 5 LKB Ultramicrotomy System Pyromitome 11800 6 2 6 Lynx Tissue Processor for Epoxy Embedding for preparing a number of specimens simultaneously 6 2 7 Baltech Critical Point Drier CPD 030 The most common technique used to dry delicate hydrated specimens for SEM investigation 6 2 8 Sorvall Biofuge primo R microfuge for the processing concentration of cellular material for TEM investigation 6 3 VARIOUS CO ATERS The coaters are used to coat the surface of specimens with a thin layer of selected conductive materials e g Cr Pt Au C etc prior to microscopy analysis O peration manuals are found wi
15. UNSW E M Unit Laboratory Handbook Revised March 2005 Contents 1 STAFF AND EQUIPMENT DIDRECTORN cnn nn nano nnnnnnnnnns 3 2 USER INSTRUCTIONS AND ACCESS PROCEDURES ccccccccccecececececceceuauaues A 2 1 INTRODUCTION EECH 4 2 2 SECURIFY EE 4 2 3 RESTRIGTED AGGESS ENER 5 2 4 INSTRUMENT BOOKINGS 00 000 data 5 25 GANGELLATION S SEENEN ANNER EE SEENEN Seat 5 2 6 OTHER WEBSITE FUNCTIONS nico covic vad ceuccatedeeussedecdeiuaedecdeastadecseuedeses 6 3 EMU LABORATORY PROCEDURES cccccccccccccccccccccccccccccccccccucccccucucucucauauavauauauauas 7 3 1 NT RODU eg H el WEE 7 3 2 LABORATORY EQUIPMENT c cccccccecccscceccceccececsccaccccaeccucecsececcaeecueeasecaecaeecsecsseeesaeceeeasecaees 7 3 3 CLEANUINESGSGINTHELARBORATObN hura ddurad rhinn ana adakan indek daa danari 7 3 4 EQUIPMENT EAILURE 000001 ee eo do Lo 7 3 5 SPEGIMEN STORAGE Sc se So ec eR EA ee 8 3 6 PHOTOGRAPHIC NEGATIVES 0 ceccccccccccsccosccsccesccascccccecesccsedccscousoschasccescesecescasscescevedcesesseancedveucdecses 8 3 7 DIGITAL IMAGES coa bance bee a Oe ae a ene beni 8 3 8 GOMPUTERS 2 riaeere Re cave Ae SES Lan Oe o e AANA ELAN EE Ade 8 4 SAFETY IN THE LABORATORY ccccececececececccccacecacecavacauauauauauauauauvavauaugueveueueveueuuanns 9 4 1 INFRODUGTION 0 tanta EE EES 9 4 2 PERSONALE SAFE TV cuida A eden ita hes bid ee dica 9 4 3 ele ee 10 4 4 FIRE IN THE LABORA TOR a 10 45 FLAMMABLE SOLVENTS units ad AEN 10 4 6 HAZARDOUS CHEMICALS
16. at bench level for use at the bench All solvents must be disposed of in the SOLVENT DISCARD CONTAINER kept in the waste storage area Small amounts of solvent can be used on the bench If you are handling large volumes you must use a fume cupboard 4 6 HAZARDOUS CHEMICALS There are 9 classes of chemical hazard We have no explosives Class 1 but we have all the other classes of hazard Class 2 2 N on flammable non toxic gas argon Class 2 3 Toxic gas chlorine Class 3 PGI Highly flammable liquids boiling point lt 35 diethyl ether 10 UNSW Electron Microscope Unit Laboratory Handbook March 2005 Class 3 PGII Highly flammable liquids boiling point gt 35 acetone petrol Class 3 PGIII Flammable liquids flash point gt 23 lt 60 Class 4 Flammable solids cellulose nitrate Class 5 1 Oxidising substances hydrogen peroxide perchloric acid Class 5 2 Organic peroxides methyl ethyl ketone peroxide benzoyl peroxide Class 6 1 Toxic substances osmium tetroxide glutaraldehyde Class 6 2 Infectious substances bacterial cultures viruses Class 7 Radioactive material our uranium salts are weak emitters Class 8 Corrosive substances hydrochloric acid sodium hydroxide We have collections of Material Safety Data Sheets MSDS for all the materials used in the laboratory They are also are available through websites such as http www proscitech com au msds htm You must read the Material Safety Data Sheets f
17. bout matters relating to occupational health safety and environment http www riskman unsw edu au You should be familiar with relevant sections of this web site Further sources of safety information are available at http www civeng unsw edu au safety start htm links fact sheets and http www proscitech com au msds htm Material Safety Data Sheets see below 4 2 PERSO NAL SAFETY You must wear protective clothing Personal Protective Equipment PPE whenever you are handling chemicals or other hazardous materials The type of protection required is specified by signage associated with a specific instrument or chemical You should also be aware of the required PPE for chemicals as specified in the Material Safety D ata Sheets MSDS for the material You must wear proper shoes with enclosed toes in the laboratory If you wear open toed sandals thongs or bare feet you will be required to leave You must wear a laboratory overall coat whenever you are working with chemicals in the preparation areas You must wear eye protection goggles or full face mask when handling corrosive or toxic chemicals or liquid gases These are provided in the laboratory You must wear gloves when handling corrosive toxic or sensitising chemicals or liquid gases Latex gloves are provided for ordinary work and heavy leather gloves are provided for work with liquid gases and other extremely cold or hot materials You must not eat or drink i
18. bsorption remove final traces with acetone moistened paper towelling and remove all resin contaminated materials in a sealed polythene bag On clothing 1 Remove at once You should be wearing a laboratory coat On skin 14 UNSW Electron Microscope Unit Laboratory Handbook March 2005 1 Wash with cold water and soap 2 DO NOT USE ACETONE WHICH ASSISTS CHEMICALS TO RAPIDLY PENETRATE THE SKIN 4 12 WASTE DISPOSAL W aste materials MUST be handled in specific ways as designated by UNSW Risk Management Unit http infonet unsw edu au poldoc admax waste htm W aste materials must be disposed of promptly in an appropriately labelled waste container You must dispose of chemicals and other materials as instructed No chemical is to be disposed of down the laboratory sinks Generally 1 Resin residues in beakers or pipettes must be polymerised for at least 24 hours at 60 C prior to disposal Used gloves and plastic pipettes are to be placed in the yellow waste bin W aste paper is to be placed in the blue recycle bin provided 4 Broken laboratory glass must be placed in the labelled Broken Glass white waste plastic bin 5 All chemical waste must be placed in the appropriate waste container provided All waste Containers for removal from the EM Unit are identified using the UNSW Waste Labels a 4 13 SHARPS Sharps is a waste classification term associated with those instruments used to puncture cut or
19. d Emission TEM STEM Installed at the University of Sydney 24 7 2 SCANNING ELECTRON MICROGCOPDER cent eeeaeeeeeee scenes eeaaeseeaaeseeeeesaeeesaeeneneeee 24 7 2 1 Cambridge S 360 SEM 1988 iaioe oina a nn nn cnc cnn 24 E22 JEOL 840 SEM 1980 0000 a a ege Ee 25 UNSW E M Unit Laboratory Handbook Revised March 2005 7 2 3 Hitachi S 900 Field Emission SEM goo1 nn 25 7 2 4 Hitachi S 4500II Field Emission SEM oop cnn 25 7 2 5 FEI Quanta 200 Environmental GEM 25 7 3 ELECTRON PROBE MICRO ANAL VER 25 7 3 1 Cameca SX50 Microprobe 1992 0cooncccinnicinnnnnnnncccoccccconnnnncnnnnno cc cnn cnn nn rana 25 7 4 FOCUSED ION BEAM MILLERS ccccceccceeeceeeceeeeeeeeeeeeeeeeeceeseeeeseeeseeeeeaeesaeesaaesaaesaeseaeeeeeeaees 26 7 4 1 Philips FEI FIB XP200 FIB oo 26 7 4 2 FEI Nova 200 Nanolab En tEnt EnEn En sEAEnSEnntEnr Ennn nnn nE nnen nE nnne 26 7 5 SCANNING PROBE MICROSCOPES oocccococccoccconoconoconoco nono non non 26 7 5 1 Veeco Digital Instruments Extended Dimension 3000 SPM 1997 aseeseen 26 7 5 2 Veeco Digital Instruments Extended Multimode SPM GOo01 27 7 6 LIGHT MICROSCOPES ites fave a e da ed it EEN 27 7 7 X RAY Allee ell 27 8 MICROSCOPY RESOURCES cccccccseseesesessseesesesseeeseseeeeeeeeeeeeseeeseeesseseseeeens 28 8 1 See http srv emunit unsw edu au and http srv emunit unsw edu au PDF_files books pdf 28 8 2 SUPPLIERS criticas stage Sieste lts da tr diese 28
20. e you were to lose consciousness due to low oxygen you would collapse into a layer of cold nitrogen gas on the floor and death by suffocation would occur For this reason you must not work alone in the laboratory nights or weekends when you are using large volumes of liquid nitrogen The nitrogen store is locked after hours to restrict use to staff Normal practice is for staff to fill the 10L and 20L dewars from the EMU bulk supply You may decant liquid nitrogen from the 10 and 20L dewars into 2L dewars as needed NEVER TIGHTLY STOPPER A CONTAINER OF LIQUID NITROGEN Pressure inside the container will quickly rise and a blow out or explosion will result 4 10 TOXIC CHEMICALS Many of the chemicals used in electron microscopy are extremely toxic Their labels advise of specific hazards and action to take in an emergency Laboratory reagents are only to be used by responsible people with a professional concern for proper procedures The advisory labels are small It is your responsibility to properly inform yourself of possible hazards by reading the MSDS for reagents you propose to use If you are in any doubt ask the EMU staff TOXIC MATERIALS SPILLS MU ST BE CLEANED UP AT ONCE BY E M UNIT STAFF DO NOT ATTEMPT TO CLEAN UP TOXIC MATERIAL SPILLS YOURSELF Seek help or advice if you find yourself in trouble Some of the more commonly used hazardous 12 UNSW Electron Microscope Unit Laboratory Handbook March 2005 chemicals are listed
21. f Image Formation and Microanalysis 4th Ed by Ludwig Reimer 1998 ISBN 3540625682 Springer Verlag Telos Transmission electron microscopy a textbook for materials science By David B Williams and C Barry Carter 1996 ISBN 0 306 45247 2 hardbound ISBN 0 306 45324 X pbk Plenum Press New York and London Working with a Scanning Electron Microscope By S K Chapman ISBN 0 850770 93 9 LO DG EM ARK PRESS LTD Bank House Summerhill Chislehurst Kent BR7 5RD England Handbook of biological confocal microscopy edited by James B Pawley 2nd ed 1995 ISBN 0306448262 29 UNSW Electron Microscope Unit Laboratory Handbook March 2005 Plenum Press New York Confocal microscopy edited by P Michaal Conn 1999 ISBN 0121822087 Academic San Diego London PRACTICAL METHODS IN ELECTRON MICROSCOPY Series edited by AUDREY M GLAU ERT Volume 1 Part Specimen Preparation in Materials Science by P J GOODHEW 1973 2nd printing 1974 viii 180 pages out of print Part Il Electron Diffraction and O ptical Diffraction Techniques by B E P BEESTON Robert W HORNE and Roy MARKHAM 1973 4th printing 1990 xiv 250 pages Volume 2 Principles and Practice of Electron Microscope O peration by Alan W AGAR Ronald H ALDERSON and Dawn CHESCOE 1974 7th printing 1990 xiv 346 pages Volume 3 Part Fixation Dehydration and Embedding of Biological Specimens by Audrey M GLAUERT 1975 7th printing 1987 xi
22. ges Volume 13 Sectioning and Cryosectioning for Electron Microscopy by Norma Reid and Julian E Beesley Published by Elsevier Amsterdam New York amp London 1991 ISBN 0444 81190 7 Volume 14 Cytochemical Staining Methods for Electron Microscopy by P R Lewis and D P Knight 1992 321 pages Volume 15 Vacuum Methods in Electron Microscopy by Wilbur C Bigelow 1994 Volume 16 X ray Microanalysis for Biologists by Alice Warley 1997 Volume 17 Biological Specimen Preparation for Transmission Electron Microscopy by Audrey M Glauert and Peter R Lewis 1999 Volume 18 Negative Staining Methods for Electron Microscopy by R W Horne and E A Munn 8 4 MICROSCOPY JOURNALS The following journals are classified as specialist microscopy journals ISI Journal Citation Reports and provide useful material particularly relating to techniques The majority of microscopy related research is published in the other science medical engineering etc journals HISTOCHEMISTRY AND CELL BIOLOGY JOURNAL OF ELECTRON MICROSCOPY JOURNAL OF MICROSCOPY OXFORD MICRON MICROSCOPY AND MICROANALYSIS MICROSCOPY RESEARCH AND TECHNIQUE SCANNING ULTRAMICROSCOPY ULTRASTRUCTAL PATHOLOGY 31
23. hat limit the maximum size of the specimen Typically specimens are mounted on stubs that are 1 inch 2 5cm in diameter The description below is generic to specimens of this size If specimens are less than 1 inch 2 5cm in diameter then they can be mounted directly on the stub This is normally done with double side carbon tape The specimen should be strongly adhered to the stub to prevent it from becoming detached during examination Materials in powdered form can simply be sprinkled on to carbon tape Different microscopes use different stubs so it is important to ensure that the correct stub is used All specimens must be normally a dry and b electrically conductive For metallic specimens this is not normally a problem however most other specimens are not electrically conductive Specimens are made electrically conductive by the application of a thin coat of electrically conductive material usually a metal Au Pt Cr or carbon These coatings are usually only a few nanometres thick and do not interfere with the structure of the specimen The choice of coating material used depends upon the experiments to be performed A metallic coating is best when only visual examination of the specimen is required Heavy metal coatings such as gold ensure a strong electron signal from the specimen and high signal to noise images However coatings from gold or other metallic elements will interfere with chemical analysis procedures Therefore if ED S W
24. i 208 pages Part Il Ultramicrotomy by Norma REID 1975 7th printing 1989 x 138 pages out of print Volume 4 Design of the Electron Microscope Laboratory by Ronald H ALDERSON 1975 2nd printing 1985 xii 130 pages Volume 5 Partl Staining Methods for Sectioned Material by P R LEWIS and D P KNIGHT 1977 6th printing 1990 xvi 312 pages Part Il X ray Microanalysis in the Electron Microscope by John A CHANDLER 1977 4th printing 1987 xvi 222 pages Volume 6 Part I Autoradiography and Immunocytochemistry by M A WILLIAMS 1977 6th printing 1990 xx 218 pages Part II Quantitative Methods in Biology by M A WILLIAMS 1977 3rd printing 1985 xx 234 pages Volume 7 Image Analysis Enhancement and Interpretation by D L MISELL 1978 2nd printing 1990 xvi 306 pages Volume 8 Replica Shadowing and Freeze Etching Techniques by J H Martin WILLISON and Arthur J ROWE 1980 xvi 302 pages Volume 9 Dynamic Experiments in the Electron Microscope by E P BUTLER and KF HALE 1981 xvi 458 pages Volume 10 Low Temperature Methods in Biological Electron Microscopy by A W ROBARDS and U B SLEYTR 1985 xx 552 pages 30 UNSW Electron Microscope Unit Laboratory Handbook March 2005 Volume 11 Thin Foil Preparation for Electron Microscopy by P J GOODHEW 1985 xiv 206 pages Volume 12 Electron Diffraction An Introduction for Biologists by D L MISELL and E B BROWN 1987 xvi 288 pa
25. ick Echlin David C Joy amp Eric Liffshin ISBN 0 306 44175 6 Second Edition 1992 Plenum Press New York and London Advanced Scanning Electron Microscopy and X Ray Microanalysis D E Newbury D C Joy P Echlin C E Fiori and J Goldstein Plenum Press New York 1986 Maintaining and monitoring the transmission electron microscope Microscopy handbooks 08 By S K Chapman ISBN 0 19 856407 4 Polymer Microscopy Second edition 1996 By Linda C Sawyer amp David T Grubb ISBN 0412 60490 6 Chapman amp Hall London Glasgow Weinheim New York Tokyo Melbourne M adras Positive Staining for Electron Microscopy M A Hayat 1975 Van Nostrand Reinhold Company New York Cincinnati Toronto London Melbourne ISBN 0442 25684 1 Stains and cytochemical methods Hayat M A 1993 ISBN 0 306 44294 9 Plenum Press New York and London Principles and Techniques of Electron Microscopy Biological Applications M A Hayat ISBN 0521632870 4th edition 2000 Cambridge University Press Microscopy Immunohistochemistry and Antigen Retrieval Methods For Light and Electron Microscopy by M A Hayat ISBN 0306467704 Plenum Pub Corp Quantitative Electron Probe Microanalysis Scott V D amp Love G Reed S J B 1995 2nd edition ISBN 0 13 104050 2 Ellis Horwood Ltd Quantitative Electron Probe Microanalysis Scott Love amp Reed 28 UNSW Electron Microscope Unit Laboratory Handbook March 2005 199
26. imen becomes the anode in this cell and material is removed Once a hole is formed a light or laser detects it and stops the polishing process Electropolishing is most definitely a black art and also requires that significant attention be given to safety However the process is rapid and takes only a few minutes to make a specimen For ceramic materials ion milling is commonly used An argon ion beam incident on the specimen at some shallow angle sputters away atoms from the surface of the material until a hole is formed Again once a hole is formed a light or laser detects it and stops the milling This process is very slow and tedious and it can take many hours to thin a specimen Increasingly difficult materials such as ceramics and semiconductors are thinned using focused ion beam FIB milling This is not dissimilar to the argon ion milling described above but uses gallium ions in a SEM type environment This is significantly more precise and faster than through argon ion milling 5 2 3 Polymers and Biological Materials Biological or polymeric materials are normally prepared for TEM examination through a number of steps which involve firstly fixing the specimen dehydrating the specimen to remove moisture staining to achieve phase contrast embedding in a polymer resin and finally sectioning of submicron thick sections to produce material thin enough to be electron transparent For these materials it is not only necessary t
27. ith an electro discharge machine which uses a copper tube with a 3mm internal diameter to cut discs A large current is passed down the tube which is held just above the specimen all immersed in an oil bath Sparks arcing from the tube to the specimen under a current of several amps cut out a 3mm diameter disc Ceramic materials can be cut using an ultrasonic cutter This uses a steel tube of 3mm internal diameter to cut discs A slurry containing SiC powder is placed between the specimen and the tube and the tube is vibrated over the surface The SiC particles embed themselves in the wall of the steel tube and cut into the ceramic These 3mm discs are then profile thinned so that the centre of the disc is so thin that it is electron transparent a few 100 nms but the outside of the disc is not thinned and remains 200 microns in thickness it is therefore easy to pick up with tweezers Thinning occurs until a hole forms in the centre of the disc If thinning is stopped immediately the hole forms the thin wedge shaped region adjacent to the hole will be suitably thin Again different methods are used depending on the 18 UNSW Electron Microscope Unit Laboratory Handbook March 2005 material For metals electropolishing is used This uses a solution usually a mixture of an acid and an organic solvent e g 20 nitric acid in methanol which is sprayed on to the specimen under the action of an electrical current The spec
28. ities may result in a review of your access privileges UNSW Electron Microscope Unit Laboratory Handbook March 2005 4 SAFETY IN THE LABO RATO RY 4 1 INTRODUCTION The EMU laboratory is not equipped to handle blood tissue containing blood live viruses and bacteria None of these types of agents are permitted to be brought into the laboratory The laboratory contains various instruments chemicals and facilities that are hazards if not properly managed We are committed to having a safe working environment EMU users breaching the safety rules set out in this Handbook and the UN SW Risk Management U nit will have their access privileges withdrawn You must know the EMU safety rules You are required to read these rules and to sign a form to stating that you have read and understood them Tasks which require high levels of risk for example handling liquid nitrogen require specific training We are required to keep a record of that training You must check the safety notice board at the east end of the laboratory for current advisory notices If you notice any hazard or have an accident in the Laboratory you must tell the Safety Officer Barry Searle x6384 or any other staff member You must comply with any safety instruction given to you http srv emunit unsw edu au EM U Safety2000 htm All injuries must be reported to the EMU First Aid Officer Ms Katie Levick x56390 UNSW Risk Management Unit also provides information a
29. ked and each digital image is saved in duplicate on the EMU laboratory network server box from which they can be accessed through the Internet using a web browser Several times a month the EMU systems administrator archives all the images All the images are accessible from any of the computers in the EMU computer room where you can use software to improve contrast crop images label them make up pages and finally print them out in draft or photo quality form If you have lots of your own images a CD ROM of your own images up to 600 standard images fit on one CD ROM can be burned for you to take away to use on your own computer You will first have to assemble your images in the directory structure you prefer 3 8 COMPUTERS The EMU Electron and Scanning Probe Microscopes and peripherals are operated by specialised computers Computers with image and word processing software and printers are available for registered users in the computer room located on Level 10 of the Applied Science Building If you require access to the computer room in the Applied Science Building please ask an EM Unit staff member for a key If you require long term access to this facility EM staff can provide you with a key for a small deposit The downloading of unauthorised or inappropriate material and or the installation of unlicensed illegal unauthorised software including encryption software on any EMU computer is forbidden Improper use of EMU computer facil
30. l Once the specimens are fixed and the moisture removed they are stained Staining is used to increase the contrast of an organic biomedical specimen O ften materials which are entirely organic in nature will exhibit very small differences in contrast from one phase to another which makes discrimination of these phases difficult Staining involves relatively heavy salts as described above which differentially attaches to different parts of the structure Different sections are therefore electron transparent to different degrees and provide some form of image contrast 19 UNSW Electron Microscope Unit Laboratory Handbook March 2005 Stained specimens are then embedded in some form or resin prior to microtoming Specimens are usually embedded in resins which cure to a high level of hardness rather than paraffin wax used in optical microscopy Common polymers are methyl methacrylates and epoxy resins These often require curing in an oven to fully set harden Thin electron transparent sections are prepared by a process called microtoming A knife made of either glass or diamond is mounted in effect on a micrometer The entire assembly is viewed through an optical microscope The knife is then used to shave thin slices from the embedded section The knife is kept stationary and the specimen is moved over the knife Glass knives are most commonly used as they are inexpensive and easy to use Diamond knives are often used for harder specimen
31. layer of insulation Containers to be used for liquid nitrogen must withstand the rapid changes in temperature and low temperature that will be achieved In the laboratory we prefer the use of stainless steel Dewars but steel encased glass Dewars are acceptable Styrofoam boxes and cups are acceptable as containers for working under liquid nitrogen but they should not be used for transportation Avoid skin contact with the liquid Cooled objects should be handled with forceps fast work is advised as forceps will rapidly cool and stick to your skin W hen transferring liquid nitrogen you must wear insulating gloves and protective face shield Pour 1 200 ml into your container and let most of it boil away to cool your container down before transferring the bulk of the volume Small splashes on the skin cause little harm The greatest hazard is having a significant volume pour into a pocket or shoe where it will be held in close contact with the skin and will be unable to leak away Ideally high boots and clothing without pockets should be worn Thick gloves will protect against casual splashes and will enable hoses to be handled in comfort In the event of a serious spill on the skin the area should be immediately flooded with copious cold water b Evolution of gas ALWAYS TRANSFER LIQUID NITROGEN IN A WELL VENTILATED AREA One ml of liquid nitrogen produces 637 ml of nitrogen gas If whilst transferring liquid nitrogen in an enclosed spac
32. le for appropriate warning labels The solution can usually be used several times When the solution becomes discoloured it must be disposed of safely see EMU Safety Officer and request that Prof Paul Munroe prepare a fresh solution 6 1 9 South Bay Technology Pc2000 Plasma Cleaner used for cleaning TEM specimens 6 2 BIOLOGICAL POLYMER SPECIMENS 6 2 1 Introduction Specimens for electron microscopy must be dry conductive or coated with a thin layer of grounded conductive material prepared with minimal effect on specimen structure Hard dry specimens most inorganic material specimens or those that are naturally self supporting need no special treatment They can be air dried or dried in the vacuum of the coating unit Insects for instance usually can be air dried without structural collapse However soft specimens especially those that have a considerable content of water need special preparation They may be dried in a variety of ways air drying freeze drying and critical point drying Detailed instructions for specimen fixing staining drying mounting cryo ultramicrotomy are available separately Users are also directed to the references Polymer Microscopy Second edition by Linda C Sawyer amp David T Grubb Chapman amp Hall London 1996 ISBN 0412 60490 6 Scanning Electron Microscopy and X Ray Microanalysis by LL Goldstein Dale Newbury P Echlin D C Joy A D Romig Jr C E Lyman C Fiori amp E Lifshin Plenum
33. mens are mounted in resin or Bakelite and polished to a high level of smoothness to prepare sections for structural analysis Even though the specimen may be metallic and conductive the resins used are insulators so the specimen requires coating A conductive silver containing paint often called silver dag is frequently used to adhere specimens to stubs and provide a conductive path from the conducting region of a specimen to for example the aluminium stub Specimens for microchemical analysis specifically done by microprobe analysis must be optically flat This must normally be polished to a significantly high standard Metallurgical type specimens are normally mounted in Bakelite or resin for polishing Geological specimens are usually mounted in glass microscope type slides Since GEN e operate under vacuum specimens must also be dry for SEM analysis There is a type of SEM variously Known as a variable pressure controlled pressure or Environmental SEM which operates at low vacuum which allows imaging of hydrated wet and or uncoated specimens Most inorganic specimens are already suitably dry and need no specific treatment Hard dry specimens most inorganic material specimens or those that are naturally self supporting need no special treatment They can be air dried or dried in the vacuum of the coating unit Insects for instance usually can be air dried without structural collapse However soft specimens especially
34. n the laboratory You may eat in the Tea making room or in one of the 9 UNSW Electron Microscope Unit Laboratory Handbook March 2005 offices Food and drinks can be kept in the bar fridge in the Tea making room Food and drinks must not be stored in any other refrigerator Drinks are prohibited near any computer or microscope 4 3 SMOKING Smoking in University buildings is forbidden Smoking in the laboratory is forbidden 4 4 FIREIN THE LABORATORY If you find a fire Call emergency 56666 and report 1 Whatis burning 2 That the fire is in the Electron Microscope Unit Basement Red Centre Building 3 Your name and telephone extension number Alert others to the danger Assist anyone who is disabled Extinguish the fire if you know how to use the nearest extinguisher If the fire alarm rings please leave the building immediately Please exit via the stairs and assemble at the front of the Red Centre EM Unit fire wardens Viera Piegerova and Jenny Norman will advise you how to exit if required 4 5 FLAMMABLE SOLVENTS Solvents such as acetone ether and propylene oxide are explosive fire hazards Naked flames matches burners spirit lamps must be 3 metres distant from any area where solvents are stored or in use as vapour can catch fire and ignite the liquid Stock volumes of flammable solvents are stored in a special flammables storage cabinet They must not be stored in a refrigerator Small volumes are stored
35. ncourage use of the equipment for research and teaching activities and we will work with you to ensure you get the best possible results All users are to observe safe and responsible working practices 2 2 SECURITY Admission to the laboratory is through validation of your University of New South Wales Staff or Student card You will be issued with a request to Security to validate your card for entry to the laboratory for the hours 8 00 am to 6 00 pm Monday Friday Initially new users will be closely supervised by one of the EMU staff members who will provide instruction in the operation of the laboratory facilities and safety procedures When you have demonstrated you are competent to operate equipment unsupervised you may be granted 24 hour seven day access Access is a privilege granted to you individually once you are trained and judged to be competent and responsible The following activities must only be performed from 8AM to 6PM Monday to Friday and must not occur outside the normal business hours Electropolishing of specimens Electro discharge machining of specimens Biological specimen preparation including cryo ultromicrotomy Cryo SEM sputter coating Sputter coating Use of precision cutting saws DE O IES Users who are using the electron microscopes outside of normal business hours must be aware that out of hours contact numbers for the Unit s Director or Deputy Director are displayed in each microscope room and througho
36. o produce thin sections but ones which are dry Not all the steps described below are required for polymeric materials Normally the specimen is stabilised by fixing and dehydration This is done in a series of steps Firstly the specimen must be fixed Fixatives may be aldehydes or oxidizers Aldehydes e g glutaraldehyde often used in a mix called Karnovsky s fixative These work by a process in which certain proteins are cross linked so forming a gel from the cytoplasmic sol They have little effect on nucleic acids and lipids but proteinaceous parts of the cell are well preserved Other fixatives are oxidizers e g osmium tetroxide Osmium reacts at the double bonds in unsaturated lipids stabilizing them Osmium deposits are precipitated at the site of reaction and so it also has a staining function It does not have a significant effect on proteins or nucleic acids As itis a relatively heavy metal deposits show up well on the TEM It is important that excess osmium be washed out e g with sodium acetate or it will oxidize other substrates used in processing forming precipitates Uranium salts such as uranyl acetate are commonly used after osmium fixation They both fix and stain the specimens Dehydration is the next stage in the processing A series of increasingly concentrated mixtures of some solvent in water is used For example 25 ethanol in water 50 ethanol in water 75 ethanol in water 95 ethanol in water 100 ethano
37. oaches for different specimen types These notes will only deal in general terms with different approaches 5 2 1 Powders Powdered specimens catalyst and other powders which are sub micron in diameter are trivial to prepare The powder is usually added to ethanol and ultrasonically stirred to create a suspension A droplet of the suspension is then removed with a pipette and dropped onto a 3mm diameter Cu grid coated with a thin film of carbon The carbon film is so thin that it is effectively transparent to electrons The powder particles become suspended on the film and the ethanol evaporates Some ceramic materials which are very brittle can also be ground up and dispersed as described above Brittle materials cleave easily during mechanical deformation through a pestle and mortar and often flat electron transparent sections can be generated 5 2 2 Metals and Ceramics Inorganic materials which are solid in form for example a piece of aluminium require much more detailed treatment for TEM preparation Typically this would involve firstly sectioning a thin 300 500 micron slice from the bulk aluminium This requires a slow speed diamond saw which cuts the material slowly to avoid unwanted heating The blade is immersed in an oil bath The saw allows thin sections to be cut with a high degree of precision Discs 3mm in diameter are then punched from the cut sheet There are different methods depending on the material Metals are cut w
38. objects within the range 2mm to 15mm See also http www skyscan be for further information NOTE The Microscopy and Imaging Unit in the School of Medical Sciences Faculty of Medicine has an excellent range of microscopy facilities This Unit provides access to equipment and services in histology light microscopy brightfield darkfield DIC phase contrast polarisation and fluorescence illumination techniques laser capture microdissection laser scanning confocal microscopy image processing and image analysis The Unit found on the first floor of the Wallace Wurth Building operates on a cost recovery basis Please contact Maria Sarris on x52469 or m sarris unsw edu au with any enquiries 27 UNSW Electron Microscope Unit Laboratory Handbook March 2005 8 MICROSCO PY RESO URCES 8 1 See http srv emunit unsw edu au and http srv emunit unsw edu au PD F_files books pdf for reference materials and links 8 2 SU PPLIERS Please ask EMU staff for advice and or consult http srv emunit unsw edu au for links 8 3 BO O K REFEREN CES This is not a complete list Please also consult http srv emunit unsw edu au and http srv emunit unsw edu au PDF files books pdf for other reference material and links Scanning Electron Microscopy and X Ray Microanalysis A Text for Biologists Materials Scientists and Geologists Joseph L Goldstein A D Romig Jr Dale E Newbury Charles E Lyman Charles Fiori Patr
39. or all the materials YOU are working with You must comply with the handling requirements stated in the sheets You must dispose of the materials as instructed The following rules are for your guidance and they are not a substitute for the MSDS information 4 7 OXIDISING SUBSTANCES You must wear comprehensive protective clothing lab coat goggles gloves when handling these materials You must use the fume cupboard with the sash low to protect your upper body 4 8 COMPRESSED GASES Only staff members are permitted to move the cylinders and replace empty ones Ensure that a suitable pressure regulator is fitted to the nitrogen and argon cylinders The CO cylinder does not require a pressure regulator When about to use a gas turn on the main valve and check that the reading on the regulator indicates gas in the cylinder If the gas flow seems inadequate ask staff to adjust the regulator Do not attempt to adjust it yourself After you have finished close the main valve 4 9 LIQUID NITROGEN Liquid nitrogen is associated with two main hazards 1 Cold burn 2 Evolution of large volumes of suffocating gas a Cold burn 11 UNSW Electron Microscope Unit Laboratory Handbook March 2005 Materials cooled by liquid nitrogen will stick to the skin and will tear the flesh if removal is attempted Some materials also become very brittle at liquid nitrogen temperature Pipes and vessels containing liquid nitrogen require a protective
40. ory material on the website prior to beginning work in the laboratory Persons who are either not registered in the EMU database or who have not completed the appropriate EMU risk assessment forms or who have not had any prior consultation and training with EMU staff are not permitted to use these facilities under any circumstances UNSW Electron Microscope Unit Laboratory Handbook March 2005 3 EMU LABORATO RY PRO CEDURES 3 1 INTRODUCTION Initially you must learn the rules of the laboratory methods for handling specimens and operation of the equipment We have a range of in house operating instructions see the EMU website so you will be well informed about operating EMU equipment You should be familiar with these manuals as part of your instruction Your probationary period will be shorter if you read the operating instructions and other related material in advance M anufacturer s manuals for each piece of equipment are also available for use in the laboratory if required They may not be removed from the laboratory Photocopies can be made if required see EMU Staff 3 2 LABORATORY EQUIPMENT Initially a staff member will introduce you to an instrument Once you are judged to be able to work safely you will be encouraged to perform the basic operations on your own When you have mastered the basic operations you will be introduced to the more advanced operations of the equipment You must not try advanced or comple
41. s some polymers for example and are more durable than glass knives They are however relatively expensive Cut sections are typically about 1 mm The colour of the cut sections is often used to indicate the section thickness These sections are then attached to copper support grids 3mm in diameter for examination in the TEM In summary the above section briefly describes some of the issues important in specimen preparation for electron microscopy However as stated above every specimen requires a slightly different approach 20 UNSW Electron Microscope Unit Laboratory Handbook March 2005 6 SPECIMEN PREPARATION EQUIPMENT Instruction manuals will be provided prior to training 6 1 INORGANIC SPECIMENS 6 1 1 Introduction Materials science inorganic specimens are typically metals or minerals or ceramics that require coating grinding or thinning to prepare them for the electron microscope Users are also directed to the references Transmission Electron Microscopy A Textbook for Materials Science by David B Williams and C Barry Carter Plenum Publishing 1996 ISBN 0 306 45324 X Scanning Electron Microscopy and X Ray Microanalysis by LL Goldstein Dale Newbury P Echlin D C Joy A D Romig Jr C E Lyman C Fiori amp E Lifshin Plenum Publishing 1992 ISBN 0 306 44175 6 The following list describe equipment provided in the E M Unit Prospective users must first be instructed by the appropriate staff PM V
42. s may also be found at the Cameca SX50 web site http cameca fr 7 4 FOCUSED ION BEAM MILLERS 7 4 1 Philips FEI FIB XP200 FIB 1998 The FIB is used for precisely controlled milling of materials in preparation for SEM and TEM examination e A fine energetic beam of gallium ions is scanned over the surface of a specimen e high beam currents sputter the specimen surface that allows subsurface cross sections to be prepared e At low beam currents the secondary electrons or secondary ions emitted from the specimen surface can be detected and used to form high resolution images It can also be used for e electron and ion imaging e surface modification o patterned deposition of conductive or dielectric materials on specimens o micro machining patterns in any material Detailed procedures for ts use are found in the FIB 200 manual Copies of the manual are available from Paul Munroe 7 4 2 FEI Nova 200 Nanolab The FEI is a dual beam focused ion instrument It comprises a high resolution ion column with a field emission source electron column The ion column is conventionally used to prepare cross sections into specimens and the electron column is used to image them The Nova is equipped with an EDAX Energy dispersive spectroscopy EPS system for elemental analysis and a TSL Electron Backscattered electron diffraction system for crystallographic analysis The Nova also includes sophisticated software packages which allow 3 dimensional recon
43. stem Detailed procedures for use of its ancillary equipment O xford Isis EDS Robinson BSD are found in their respective manuals Copies of these manuals are available from Paul Munroe 7 2 5 FEI Quanta 200 Environmental SEM The Quanta 200 is an environmental scanning electron microscope which operates under a low vacuum so that specimens may be examined in a hydrated or uncoated state This overcomes many of the limitations of conventional specimen preparation It is equipped with an EDAX Energy dispersive spectrometer for elemental chemical analysis and a Renishaw Structural Chemical Analyser SCA for identification of chemical compounds 7 3 ELECTRON PROBE MICRO ANALYSER 7 3 1 Cameca SX50 Microprobe 1992 The SX50 is used for fully automated quantitative microanalysis using wavelength dispersive spectrometers to analyse the X ray spectra emitted by electron irradiated specimens e secondary or backscattered electron imaging modes e high resolution and high quality x ray maps e detection and non destructive analysis of almost all elements from Boron 4 and heavier in the periodic table e Oxford EDS with Moran Scientific software e analysing crystals Lif TAP PET PCO PC1 PC2 PC3 e Instrumental calibration is carried out using certified standard reference materials and suitable data reduction matrix correction procedure SAM x PC Based software 25 UNSW Electron Microscope Unit Laboratory Handbook March 2005 Procedure
44. structions of specimens and automated TEM preparation 7 5 SCANNING PROBE MICROSCOPES 7 5 1 Veeco Digital Instruments Extended Dimension 3000 SPM 1997 Scanning Probe Microscopy Atomic Force Microscopy Scanning Tunnelling Microscopy provides non destructive three dimensional high spatial resolution real space images of surfaces Images are formed by detecting the local interactions inter atomic forces tunnelling current respectively between the specimen surface and a sharp probe STM is possible for conductive specimens only The D3000 provides e high resolution AFM and STM Nanoscope III controller e scanning probe fixed specimen configuration Specimen size is fairly unrestricted e extended options include phase electrical and magnetic imaging also imaging in a fluid environment is possible e Standard probes supplied OTESPA NSC15 OTR8 DNP DNP S See staff Detailed procedures for use options are found in the Dimension 3000 manual See also http www veeco com html product_bymarket_proddetail asp ProductID 178 for applications notes links etc 26 UNSW Electron Microscope Unit Laboratory Handbook March 2005 7 5 2 Veeco Digital Instruments Extended Multimode SPM 2001 Scanning Probe Microscopy SPM enables non destructive three dimensional high spatial resolution real space images of surfaces via detection of local interactions between the specimen surface and a sharp probe The Multimode provides e
45. t Web page is at http srv emunit unsw edu au Select bookings enter your login name and password and make a booking If any problems are experienced please advise the systems administrator Dong Ming Zheng x56680 The rules for booking instruments endeavour to give the greatest possible access to instruments at times suitable to individual researchers Bookings may be made four weeks in advance We generally prefer you to book for 2 4 hour sessions to give everyone a chance in the day EMU staff must approve longer sessions in normal working hours External users who have to travel to the University and those using special techniques e g cryomicroscopy may be entitled to longer sessions 2 5 CANCELLATIONS If you cannot attend a session you have booked please log on to the booking system cancel your booking and advise the staff as soon as possible in order to make the equipment available to other 5 UNSW Electron Microscope Unit Laboratory Handbook March 2005 users Users will be charged for microscope session they fail to turn up for and users who consistently fail to turn up for booked time will be excluded from the facility 2 6 OTHER WEBSITE FUNCTIONS The EMU website is the gateway for all transactions with the Unit Newsletters information about working in the Unit the equipment the computer system staff directory digital data retrieval and the booking system may be accessed on the website Read the introduct
46. th the instruments some are also available from http srv emunit unsw edu au Sputter and evaporative coating options are available JEO L vacuum evaporation coaters JEE 400 and JEE 4B The JEO L coaters are operated by staff only Give your samples to Viera Piegerova or Barry Searle for coating at least one day before your SEM session Gold carbon aluminium chromium e Polaron E5000 sputter coater Gold pre dates magnetron sputtering head and therefore may heat samples during coating e Balzers carbon fibre carbon coater Carbon e Xenosput high resolution sputter coater Chromium e Emitech K575 dual head turbo chromium sputter coater Chromium gold e Polaron E6000 sputter coater Gold e EMITECH K 575 sputter coater Gold Itis preferable to examine your specimens immediately If this is not possible store them on their stubs in evacuated vacuum desiccators The coating does not prevent rehydration Shrinking and swelling due to hydration changes will produce discontinuities in the conductive film 23 UNSW Electron Microscope Unit Laboratory Handbook March 2005 7 MICROSCOPES O peration details are found in the user s manual with the instrument and are also available from http srv emunit unsw edu au 7 1 TRANSMISSION SCANNING TRANSMISSION ELECTRON MICROSCOPES 7 1 1 Hitachi H 7000 TEM STEM 1988 The H 7000 is mainly used for analysis of thin sections of both biological materials and polymers STE
47. those that have a considerable content of water need special preparation They may be dried in a variety of ways that can minimise damage There are three methods of reducing or bypassing the effect of surface tension when drying specimens 1 To substitute for the water in the specimen a solvent with lower surface tension such as acetone or ether and then evaporate the substituted solvent in air 2 To freeze the water in the specimen and sublime the ice under vacuum freeze drying After solvent substitution it can be useful to freeze dry to remove the solvent 3 To substitute for the water in the specimen a fluid with a suitable critical point and pass the specimens through the critical point In air drying the damage is caused by surface tension forces which collapse delicate structures as a liquid gas interface passes through the specimen Low viscosity solvents e g ether have lower surface tensions hence reduce damage somewhat In freeze drying a solid gas interface passes through the specimen In a process called critical point drying there is a phase change from liquid to gas without the formation of a phase interface Critical point drying is the most commonly used technique to dry delicate hydrated specimens If a liquid and its vapour are sealed into a pressure vessel and heated the vapour pressure and vapour density will increase as molecules join the vapour phase and the liquid density will decrease Ata particular tempera
48. ture and pressure the critical point the density of the vapour equals the density of the liquid and the boundary between the two phases disappears At temperatures and pressures above or below the critical point only one phase exists and the surface tension is zero A specimen immersed in a liquid passed through its critical point will find itself in the gas phase i e dry without having passed through a gas liquid interface Although collapse of the specimen is 17 UNSW Electron Microscope Unit Laboratory Handbook March 2005 avoided shrinkage of 20 40 can occur The critical point of water is 374C and 3270 psi conditions which will destroy biological tissue Tissue water must therefore be substituted with a solvent having a less extreme critical point Carbon dioxide has a suitable critical point of 31C and 1100 psi and is also cheap non polluting note it is a suffocating gas Critical point drying is performed in a pressure chamber 5 2 TRANSMISSION ELECTRON MICROSCOPY Transmission electron microscopy requires specimens that are electron transparent The typical thickness of a TEM specimen is 200nm For some applications much thinner specimens are required TEM specimens are also routinely discs 3mm in diameter Therefore the specimen must be reduced from the bulk as received dimensions and in doing so must exhibit a structure which is artefact free and representative of the bulk material There are a range of appr
49. ut the Unit They must also be aware of the University s emergency procedures and that emergency services can be contacted through UNSW Security on 56666 You must not lend your card to anyone else You must not give access to any person who does not have valid card In doing so you become personally responsible for any loss damage they cause and or any harm they may come to in the laboratory If you wish to bring an unregistered co worker into the unit with you to observe during your session you must first obtain permission from EMU staff This person must remain with you at all times while they are in the Unit It is essential that EMU staff know who is in the Unit for safety reasons Similarly you must not wedge open the security entry door or tamper with the lock The swipe card system protects EM U s multi million dollar assets against unauthorised access and misuse The swipe card system records the identity of the cardholder and the time of its use in any of the EMU doors So we Can readily check who has entered the laboratory in case of any theft or damage Your ID card may also be used to log on to the microscopes This records usage and allows EMU staff to check 4 UNSW Electron Microscope Unit Laboratory Handbook March 2005 who was using a particular instrument at any particular time All users working in the laboratory must be registered and recorded in the EMU database Prior to training new users are required to fill out a
50. very high resolution AFM and STM Nanoscope III controller e fixed probe configuration specimen is mounted on piezo scanning tube hence specimen size is restricted e extended options possible include phase electrical and magnetic imaging also electrochemical and imaging in a fluid environment e Optional anti vibration configuration bungee available for high resolution work e Standard probes supplied O TESPA NSC15 OTR8 DNP DNP S See staff Detailed procedures for use options are found in the Multimode manual See also http www veeco com html product bymarket proddetail asp ProductlD 177 for applications notes links etc 7 6 LIGHT MICROSCOPES Various light microscopes are available in the EMU For example e Zeiss W Microscope with phase contrast optics and digital camera attachments e Olympus BH 2 Microscope with Universal Illumination system for the examination of specimens using incident reflected light polarised light and dispersion staining The microscope is equipped with a filar micrometer for measurement of particle and fibre size and a DP12 Digital Camera System 1 7 X RAY MICRO SCO PE The Skyscan Micro CT enables 3 dimensional reconstruction and analysis of an object to be generated from 2 dimensional x ray shadow projections e X ray source accelerating voltages from 20 80kV e Non destructive imaging technique requiring no specimen preparation e Capable of spatial resolutions of 3 5um e Best suited to
51. x procedures with the equipment unless you have been given approval and you have been trained appropriately Do not press buttons or initiate operations where you do not know the outcome of such steps The Unit provides many small items like pipettes glassware forceps glues etc for your use Laboratory supplies must never be borrowed or removed from the laboratory 3 3 CLEANLINESS IN THE LABORATORY Good working practices are essential to ensure optimum results It is important to have moderately clean and dust free working areas and to keep the region in the immediate vicinity of grids in preparation scrupulously clean Use disposable work surfaces like filter paper circles or Parafilm squares that can be taken fresh when you begin work and discarded once you have finished Your co operation is important in helping us to keep the laboratory clean and tidy Untidy workbenches are a hazard You must clean up workbenches after you have finished When you have finished your work e Thoroughly clean any instruments or apparatus you have used and replace them in their drawer or cupboard e Replace protective covers where they are supplied e Clean up all mess and any spills with paper towelling or appropriate clean up kit e Leave the work area clean and tidy for the next person e After using electron microscopes remember to log out e Rinse all glassware thoroughly before putting it out to be washed e Ensure all flames spirit lamps
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