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Development of experimental setup for study of adsorption characteristics of porous materials down to 4.2 K

Behera, U and Kasthurirengan, S and Krishnamoorthy, V and Kumar, Senthil A and Kuzhiveli, BT and Gangradey, Ranjana (2012) Development of experimental setup for study of adsorption characteristics of porous materials down to 4.2 K. In: Advances in Cryogenic Engineering: Transactions of the Cryogenic Engineering Conference - CEC, 13–17 June 2011, Spokane, Washington, USA, pp. 1285-1292.

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Official URL: http://dx.doi.org/10.1063/1.4707052


The knowledge of adsorption characteristics of activated carbon (porous material) in the temperature range from 5 to 20 K is essential when used in cryosorption pumps for nuclear fusion applications. However, such experimental data are very scarce in the literature, especially below 77 K. So, an experimental system is designed and fabricated to measure the adsorption characteristics of porous materials under variable cryogenic temperatures (from 5 K to 100 K). This is based on the commercially available micropore-analyser coupled to a closed helium cycle two-stage Gifford McMahon (GM) Cryocooler, which allows the sample to be cooled to 4.2 K. The sample port is coupled to the Cryocooler through a heat switch, which isolates this port from the cold head of the Cryocooler. By this, the sample temperature can now be varied without affecting the Cryocooler. The setup enables adsorption studies in the pressure range from atmospheric down to 10(-4) Pa. The paper describes the details of the experimental setup and presents the results of adsorption studies at 77 K for activated carbon with nitrogen as adsorbate. The system integration is now completed to enable adsorption studies at 4.2 K.

Item Type: Conference Proceedings
Series.: AIP Conference Proceedings
Publisher: American Institute of Physics
Additional Information: Copyright of this article belongs to American Institute of Physics.
Keywords: Activated Carbon; Adsorption; Fusion; Cryopump; Cryocooler
Department/Centre: Division of Physical & Mathematical Sciences > Centre for Cryogenic Technology
Date Deposited: 05 Mar 2013 08:11
Last Modified: 05 Mar 2013 08:11
URI: http://eprints.iisc.ac.in/id/eprint/45411

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