나노다공체 물성 측정을 위한 극저온(20K) 수소 BET 개발 및 응용
(주)코리아스칼라
- 최초 등록일
- 2023.04.05
- 최종 저작일
- 2017.09
- 5페이지/ 어도비 PDF
- 가격 4,000원
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서지정보
ㆍ발행기관 : 한국재료학회
ㆍ수록지정보 : 한국재료학회지 / 27권 / 9호
ㆍ저자명 : 박재우, 오현철
목차
1. 서 론
2. 실험 방법
2.1 Cryostat 제작
2.2 온도와 저온 부피 보정(calibration)
3. 결과 및 고찰
4. 결 론
Acknowledgement
References
영어 초록
With the matters of climate change, energy security and resource depletion, a growing pressure exists to search for replacements for fossil fuels. Among various sustainable energy sources, hydrogen is thought of as a clean energy, and thus efficient hydrogen storage is a major issue. In order to realize efficient and safe hydrogen storage, various porous materials are being explored as solid-states materials for hydrogen storage. For those purposes, it is a prerequisite to characterize a material’s textural properties to evaluate its hydrogen storage performance. In general, the textural properties of porous materials are analyzed by the Brunauer-Emmett-Teller (BET) measurement using nitrogen gas as a probe molecule. However, nitrogen BET analysis is sometimes not suitable for materials possessing small pores and surfaces with high curvatures like MOFs because the nitrogen molecule may sometimes be too large to reach the entire porous framework, resulting in an erroneous value. Hence, a smaller probe molecule for BET measurements (such as hydrogen) may be required. In this study, we describe a cost-effective novel cryostat for BET measurement that can reach temperatures below the liquefaction of hydrogen gas. Temperature and cold volume of the cryostat are corrected, and all measurements are validated using a commercial device. In this way, direct observation of the hydrogen adsorption properties is possible, which can translate directly into the determination of textural properties.
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