Molecular sieve valves driven by adsorbate-adsorbate interactions: Hysteresis in permeation of microporous membranes
Journal of Chemical Physics, ISSN: 0021-9606, Vol: 122, Issue: 20, Page: 204706
2005
- 4Citations
- 10Captures
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Article Description
A recently derived mesoscopic framework describing activated micropore diffusion is employed to explore system criticality in microporous membranes under nonequilibrium conditions. Rapid exploration of parameter space, possible with this continuum framework, elucidates a novel temperature-induced ignition and extinction of the molecular flux under a macroscopic gradient in pressure (chemical potential). Deviation from equilibrium like phase behavior (i.e., shifting and narrowing of phase envelopes and double hysteresis) derives from asymmetry of the coupled boundaries of the nonequilibrium membrane. We confirm this new phase behavior, akin to "opening" and "closing" of a molecular valve, via gradient kinetic Monte Carlo simulations of thin one-dimensional and three-dimensional systems. The heat of adsorption, strength of adsorbate-adsorbate intermolecular forces, and chemical potential gradient are all shown to control 'valve' actuation, suggesting potential implications in chemical sensing and novel diffusion control. © 2005 American Institute of Physics.
Bibliographic Details
AIP Publishing
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