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Hysteresis Phenomena in Nanoconfinements: Density Functional Theory and Experiments

Published online by Cambridge University Press:  10 February 2011

A.V. Neimark  and
P.I. Ravikovitch
A.V. Neimark
Affiliation:
TRI/Princeton, 601 Prospect Av., Princeton, NJ, 08542–0625, [email protected] Chemical Engineering/Yale University, New Haven, CT, 06520–8286
P.I. Ravikovitch
Affiliation:
Chemical Engineering/Yale University, New Haven, CT, 06520–8286
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Abstract

Hysteresis phenomena are observed in many nanoporous environments during adsorption/desorption isothermal quasiequilibrium cycles. A non-local DFT model has been developed for predicting adsorption/desorption isotherms in nanopores of different geometries in the wide range of pore sizes (0.5–10 nm) based on given intermolecular fluid/fluid and fluid/solid potentials. Depending on the confining geometry and the intermolecular potentials two types of hysteresis phenomena are occurred: capillary condensation/evaporation that implies volume filling of pores with a liquid-like matter, and layering adsorption/desorption that implies sequential step-wise formation of adsorption layers. It is shown that the DFT model qualitatively describes these phenomena and is in a reasonable quantitative agreement with some of the experiments.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 464: Symposium FF – Dynamics in Small Confining Systems III , 1996 , 165
Copyright
Copyright © Materials Research Society 1997

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References

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