EMS MATERIALS SCIENCE & METROLOGY CATALOG 2019–20 EDITION EQUIPMENT & ACCESSORIES  Cryo Transfer Systems (continued)


PP3006 CoolLok (continued)


Cold stage and cold trap A highly stable, thermally isolated, nitrogen gas-cooled cold stage attaches to the microscope stage. The location and shape of the cold trap is tailored to suit the internal geometry of the


Cold stage


Cold trap - adapted to installation


microscope. Both cold stage and cold trap are capable of reaching temperatures down to -190°C with a stability of <0.5°C. For easy specimen exchange an LED chamber light is fitted.


The cold stage connects to the microscope stage using an adaptor and has a dovetail fitting to accept a specimen holder. When not in use the cold stage is uncoupled and stored within the chamber with the gas and electrical fittings connected.


Cooling dewar, trolley and controller The cold stage and cold trap are cooled by a remotely- positioned, vacuum isolated 21L dewar and heat exchanger assembly which at normal operating


temperatures can run for up to 24 hours between fills. The gas lines between the dewar and the microscope interface are vacuum isolated for maximum thermal efficiency.


Stable emulsion of a hydrophobic polymer


This image illustrates a stable emulsion of a synthetic liquid polymer dispersed in an aqueous continuous phase.


Dewar and Controller


The cooling dewar sits on a floor-mounted trolley which also houses the monitor/controller for cold stage and monitor for cold trap, plus nitrogen gas flow controllers.


Rapid freezing station (24429) With the standard CoolLok, specimen freezing is by contact with the microscope cold stage following transfer and therefore freezing rates are relatively slowly. This is suitable for hard, non-hydrated specimens, but for liquid-based material rapid freezing is essential to reduce the detrimental effects of ice crystal growth and to allow through-vacuum transfer onto the cold stage.


For these applications the optional nitrogen slush freezing station is required. However, for many applications (especially lifesciences) cold fracturing and sputter coating are essential process steps and require the advanced capabilities of the EMS PP3010T – a full cryo preparation system.


Use


The specimen is mounted on a suitable holder (shuttle) and the transfer device fitted onto the airlock and the dead space evacuated to a pre-set vacuum level. The gate valve is opened and the specimen guided onto the SEM stage.


For transfer from other vacuum systems, or a glove box, additional interface flanges are available on request. Vacuum transfers can be made from the optional 24429 trolley-mounted nitrogen slush freezing station, if fitted.


Pumping The QuickLok requires either a rotary pump or oil-free turbomolecular pumping station (see Options). 205 Latex


Latex particles are very electron beam sensitive, so cryo-SEM is an ideal method for there observation


Heat exchanger


Wax crystals in gas oil


When cooled to a temperature below about 2°C, the waxes in fuel oils such as this tend to crystallize out. Wax crystal size and shape can be varied by altering the rate at which the oil is cooled.


Plunge freezing in slushy nitrogen


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