Expansion or contraction of slit pores due to gas uptake

F. Ancilotto, Milton Walter Cole, A. Grosman, E. S. Hernández, F. Toigo

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Adsorption inside a slit pore of flexible width w is explored, with a focus on how w varies as a function of the external pressure P of a gas in equilibrium with the adsorbate within the pore. The analysis is first carried out in general, using a minimization of the thermodynamic grand potential energy of the system. This leads to an equation predicting both the gas uptake N as a function of chemical potential μ and the expansion (or contraction) of the pore in response to the adsorbate's pressure. The resulting equilibrium behavior depends on the elastic parameters of the host material. Explicit results are derived for three adsorption systems: a low density fluid, Ar (a classical fluid at finite temperature T) in a graphite pore and 4He within a Au pore at T=0. The resulting behaviors include some situations where the pore expands and others for which it contracts. The difference arises from the sign of the thermodynamic response of the fluid as a function of slit width.

Original languageEnglish (US)
Pages (from-to)284-301
Number of pages18
JournalJournal of Low Temperature Physics
Volume163
Issue number5-6
DOIs
StatePublished - Jun 1 2011

Fingerprint

contraction
slits
Gases
Adsorbates
porosity
expansion
Fluids
gases
Thermodynamics
Adsorption
Graphite
Chemical potential
Potential energy
fluids
thermodynamics
adsorption
graphite
potential energy
Temperature
optimization

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Ancilotto, F., Cole, M. W., Grosman, A., Hernández, E. S., & Toigo, F. (2011). Expansion or contraction of slit pores due to gas uptake. Journal of Low Temperature Physics, 163(5-6), 284-301. https://doi.org/10.1007/s10909-011-0350-4
Ancilotto, F. ; Cole, Milton Walter ; Grosman, A. ; Hernández, E. S. ; Toigo, F. / Expansion or contraction of slit pores due to gas uptake. In: Journal of Low Temperature Physics. 2011 ; Vol. 163, No. 5-6. pp. 284-301.
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Ancilotto, F, Cole, MW, Grosman, A, Hernández, ES & Toigo, F 2011, 'Expansion or contraction of slit pores due to gas uptake', Journal of Low Temperature Physics, vol. 163, no. 5-6, pp. 284-301. https://doi.org/10.1007/s10909-011-0350-4

Expansion or contraction of slit pores due to gas uptake. / Ancilotto, F.; Cole, Milton Walter; Grosman, A.; Hernández, E. S.; Toigo, F.

In: Journal of Low Temperature Physics, Vol. 163, No. 5-6, 01.06.2011, p. 284-301.

Research output: Contribution to journalArticle

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Ancilotto F, Cole MW, Grosman A, Hernández ES, Toigo F. Expansion or contraction of slit pores due to gas uptake. Journal of Low Temperature Physics. 2011 Jun 1;163(5-6):284-301. https://doi.org/10.1007/s10909-011-0350-4