Testing a Two-State Model of Nanoconfined Liquids:  Conformational Equilibrium of Ethylene Glycol in Amorphous Silica Pores

Molecular dynamics simulations of the conformational equilibrium of ethylene glycol in roughly cylindrical nanoscale amorphous silica pores are presented and analyzed in the context of a two-state model of confined liquids. This model assumes that an observable property of a confined liquid can be d...

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Bibliographic Details
Published in:Langmuir 2006-12, Vol.22 (26), p.10919-10923
Main Authors: Gulmen, Tolga S, Thompson, Ward H
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Porous materials
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Summary:Molecular dynamics simulations of the conformational equilibrium of ethylene glycol in roughly cylindrical nanoscale amorphous silica pores are presented and analyzed in the context of a two-state model of confined liquids. This model assumes that an observable property of a confined liquid can be decomposed into a weighted average arising from two subensembles with distinct physical attributes:  molecules at the surface and molecules in the interior of the pore. It is further assumed that the molecules in the interior exhibit behavior that is indistinguishable from that of the bulk liquid. However, the present simulation results are not consistent with this two-state model. Neither the assumption of two distinct subensembles nor the assumption that the interior molecules possess bulk-like behavior is supported.
ISSN:0743-7463
1520-5827
DOI:10.1021/la062285k