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Seminar on Adsorption : Adsorption

Ultimate Pressure in Gas Adsorption Measurement

It is coming to be important to measure the adsorption isotherm under the high vacuum condition for the analysis of micropore and surface characterization. Currently, it is easy to achieve clean high vacuum by the use of turbo molecular pump and other techniques. On the other hand, it is difficult to achieve the good ultimate pressure in the sample cell for the volumetric method because the apparatus has a lot of pressure sensors, valves, tubes, and joints. The graph shows the difference of gas emission between the solenoid valve and pneumatic valve. Since the solenoid valve uses the rubber material for sealing, there is large amount of gas emission. BELSORP series uses the combination of pneumatic valves and high vacuum system, and by the combination, we have succeeded to lower the gas emission drastically. As the result, the accuracy of adsorption measurement at the very low-pressure region is improved, and also, the reliability of micropore analysis is improved.

Gas emission from valves

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