K750X freeze dryer

K750XFreeze drying machine

If the water containing sample is naturally dried or dried in the air, the surface tension of the liquid will cause the sample to shrink and deform. One method to reduce deformation is to freeze dry the sample, which involves the principle of the three state equilibrium point in physics. Water has three states: solid, liquid, and gas. According to thermodynamic equilibrium theory, as the pressure decreases, the freezing point of water does not change much, while the boiling point decreases and approaches the freezing point. When the pressure drops to a certain degree of vacuum, the boiling point and freezing point of water coincide, and ice can vaporize directly into gas without going through a liquid state, a process called sublimation. The vacuum freeze-drying of samples is the process of sublimating and removing the pre frozen water in the sample below the triple point of water, i.e. under low temperature and low pressure conditions. The sublimation rate is a function of temperature and vacuum degree, and the typical drying time is several hours or longer. Freeze dryers are commonly used for pre drying of water samples under electron microscopes and similar applications.

K750XFreeze dryer, usingPeltierRefrigeration thermoelectric temperature control sample stage, using a rotating mechanical pump to evacuate. The temperature and timer time can be pre-set, and the drying process can be automatically completed. At the end of the drying process, the sample can be brought to room temperature or heated before embedding.

The container containing desiccant is placed inK750XIn the working chamber, this can enhance the removal effect of water vapor. A suitable sized container can also be placed in the vacuum chamber to prepare liquid nitrogen "snow mud", thereby increasing the cooling rate during pre cooling treatment of the sample.

Instrument features:

•Thermoelectric cooling and heating methods, precise temperature control

Peltier Semiconductor Refrigeration/Heating sample stage, easy to use

• Intuitive menu driven operation, easy to set up and run

• Automatic drying cycle-Unmanned operation

Ideally, freeze-drying should be carried out at temperatures below the recrystallization point of ice, but this requires a long drying time. In practice, people have found that-60°CThe drying temperature (if used)15°CThe cooling circulating water device-Equipped with a heater/The cooler option can achieve acceptable drying results at the vacuum level achieved by a two-stage rotating mechanical vacuum pump. However, for some fine samples, it is necessary to lower them below-80Dry at a lower sublimation rate at a temperature of ℃; This requires a better vacuum degree than using a rotary mechanical pump alone for vacuuming, as well as lower drying temperatures, such as liquid nitrogen temperature. For such applications, it is recommended to use liquid nitrogen cooling and turbo molecular pump vacuum pumpingK775XFreeze drying equipment.

In addition to freeze-drying machines, we also offer three critical point dryers: one with a vertical chamberK850Critical point dryer; Having a horizontal chamberE3100Critical point dryer; greaterK850WMThe critical point dryer is designed for semiconductor applications and can perform critical point drying6Inch wafers. These drying equipment products are specifically designed for scientific research purposes.