Freeze Dryer

K750X/K775X from Quorum Technologies

Freeze-drying is a well-established method to prepare specimens for TEM and SEM. Freeze-drying reduces the distortion and shrinkage effects that occur when a wet sample dries by normal evaporation. The method involves careful sublimation of frozen specimens under vacuum.  

Features
Thermoelectric cooling and heating
Peltier cooling/warming stage (± 60°C)
Automatic drying cycle
Intuitive menu-driven operation

The freeze drying method reduces the shrinkage effects and distortion that occur when a hydrous specimen dries by normal evaporation. Distortion happens due to the forces of surface tension that occur when water changes state from liquid to vapor. Freeze drying overcomes this problem by gentle sublimation of frozen samples under vacuum. It skips the liquid phase and thereby reduces distortion effects. The rate of sublimation is a function of temperature and vacuum with typical drying times being several hours or longer.

Ideally, specimen preparation is carried out at temperatures below the recrystallization point of ice which results in very long drying times. Reasonable results under vacuum can be achieved at temperatures of -60 °C. The K750X freeze dryer operates at rotary pump vacuum using a Peltier thermoelectric stage with drying temperatures of down to -60 °C for the careful sublimation of frozen specimens.

For delicate specimens it is necessary to dry at temperatures below -80 °C with a lower sublimation rate. This requires better vacuum than can be obtained using a rotary vacuum pump alone and the lower temperatures associated with liquid nitrogen. The K775X uses a turbomolecular pumping unit and can operate at temperatures down to -140 °C.

K750X Peltier-cooled EM freeze dryer
Weight and dimensions 450 mm x 350 mm x 175 mm (WxDxH), 18 kg
Work chamber Borosilicate glass 165 mm Ø x 125 mm H
Safety shield Polycarbonate cylinder
Timer 0-999 hours
Specimen stage ±60 °C
Temperature controller and monitor ±90 °C, display resolution up to 0.1 °C
Vacuum gauge range Atmosphere to 1x10-2 mbar
Vacuum pump (order separately) 5 m3/h or more (AG-DS102), range: to 10-2 mbar
Water cooling at nominal 15 °C (E4860 recommended)
Electrical supply 230 V/50 Hz (6 A max., including pump)
Options
E48600.2 HP Recirculating heater/chiller (400 W) with high pressure pump
EK4180Stand-alone liquid nitrogen slushing chamber (requires additional rotary pump, eg AG-DS102)
K775X Liquid Nitrogen Cooled, Turbo-pumped EM  freeze dryer
Weight and dimensions 450 mm x 350 mm x 175 mm (WxDxH), 18 kg
Work chamber Borosilicate glass 165 mm Ø x 125 mm H
Safety shield Polycarbonate cylinder
Timer 0-999 hours
Specimen stage -140 °C to +40 °C. Initial cool down to -140 °C in approximately 45 minutes - final temperature can be lower
Vacuum gauge range 1x10-2 mbar to 1x10-5 mbar
Vacuum 60 l/s built-in air cooled turbo-molecular pump
‘Backing’ rotary pump 5 m3/h or more (AG-DS102), range: to 10-2 mbar (order separately)
Electrical supply 230 V/50 Hz (6 A max., including pump)
Supplied withVacuum hose and connectors, moisture trap and operating manual
Options
AG-DS1025 m3/h, 2 stage oil sealed rotary vane pump incl. oil, mist filter
EK4180Stand-alone liquid nitrogen slushing chamber (requires additional rotary pump, eg AG-DS102)

 

 

 

 

Contacts

Request further information
Product Manager - Materials science
+49 6151 8806-10
Fax: +49 6151 8806910
Product Manager - Electron microscopy & nanotechnology
+49 6151 8806-12
Fax: +49 6151 8806912

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