Journal
LANGMUIR
Volume 22, Issue 26, Pages 10919-10923Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la062285k
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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.
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