Automated Cold Volume Calibration of Temperature Variation in Cryogenic Hydrogen Isotope Sorption Isotherm

Jawoo Park; Hyunchul Oh

doi:10.3740/MRSK.2019.29.5.336

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2019 Vol.29, Issue 5 Preview Page

Automated Cold Volume Calibration of Temperature Variation in Cryogenic Hydrogen Isotope Sorption Isotherm 극저온(20K) 수소동위원소 흡착 등온선의 온도 변화에 대한 자동 저온 부피 교정

May 2019. pp. 336-341

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Abstract

The gas adsorption isotherm requires accurate measurement for the analysis of porous materials and is used as an index of surface area, pore distribution, and adsorption amount of gas. Basically, adsorption isotherms of porous materials are measured conventionally at 77K and 87K using liquid nitrogen and liquid argon. The cold volume calibration in this conventional method is done simply by splitting a sample cell into two zones (cold and warm volumes) by controlling the level sensor in a Dewar filled with liquid nitrogen or argon. As a result, BET measurement for textural properties is mainly limited to liquefied gases (i.e. N₂ or Ar) at atmospheric pressure. In order to independently investigate other gases (e.g. hydrogen isotopes) at cryogenic temperature, a novel temperature control system in the sample cell is required, and consequently cold volume calibration at various temperatures becomes more important. In this study, a cryocooler system is installed in a commercially available BET device to control the sample cell temperature, and the automated cold volume calibration method of temperature variation is introduced. This developed calibration method presents a reliable and reproducible method of cryogenic measurement for hydrogen isotope separation in porous materials, and also provides large flexibility for evaluating various other gases at various temperature.

Keywords

calibration method

cryogenic measurements

cold volume and temperature calibrations

accuracy

adsorption isotherm

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 29
No :5
Pages :336-341
Received Date : 2019-04-30
Revised Date : 2019-05-12
Accepted Date : 2019-05-14
DOI :https://doi.org/10.3740/MRSK.2019.29.5.336

Korean Journal of Materials ResearchISSN:1225-0562(Print) 2287-7258(Online)한국재료학회

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