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Diffusion Anomaly at Low Temperatures in Confined Systems from the Rare Events Method

Ghorai, Pradip Kr and Yashonath, Subramanian (2004) Diffusion Anomaly at Low Temperatures in Confined Systems from the Rare Events Method. In: Journal of Physical Chemistry B, 108 (22). pp. 7098-7101.

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Abstract

Size dependence of self-diffusivity of monatomic spherical sorbates within zeolite NaY has been investigated at low temperatures. Self-diffusivity, D, exhibits a pronounced maximum when the size of the diffusant is comparable to the void size. The value of D in the anomalous regime is 17 orders of magnitude higher as compared to the linear regime. The implication of these results on separation of mixtures is discussed. Frequency of the recrossing events across the barrier to diffusion and its dependence on the size as revealed by the transmission coefficient are discussed.

Item Type: Journal Article
Additional Information: The copyright belongs to American Chemical Society.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 11 May 2006
Last Modified: 19 Sep 2010 04:26
URI: http://eprints.iisc.ernet.in/id/eprint/6664

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