Cryo-SEM is a technique used to view cryogenically fixed (frozen) samples in a cryogenic chamber attached to the SEM. Frozen samples remain fully hydrated in the high vacuum chamber to minimize the occurrence of artifacts and sample alteration from the dehydration process during standard SEM sample preparations.
Hitachi S4700 SEM
Leica VCT 100 cryo-transfer system
- Cryo-fixation in liquid nitrogen and sample loading into the cryo-chamber system
- Sample fractured using a cold knife for viewing of the fractured surface (Sample Temperature: -170°C)
- Sublimation of ice with heater (Sample Temperature: -105°C – -90°C)
- Sputter coating with Gold/Pt (Sample Temperature: -115°C)
- Cryo-SEM imaging (Maintained Sample Temperature: -120°C)
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