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Normal-Strain Induced Change in Lattice-Type for Confined Cyclohexane Films

Published online by Cambridge University Press:  10 February 2011

J.E. Curry  and
J.H. Cushman
J.E. Curry
Affiliation:
Department of Soil, Water and Environmental Science, University of Arizona, Tucson, AZ 85721, curry@ag.arizona.edu
J.H. Cushman
Affiliation:
Center for Applied Mathematics, Math Sciences Building, Purdue University, West Lafayette, IN 47907
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Abstract

One to three layer cyclohexane films confined between mica-like surfaces are studied to elucidate changes in the films' lattice-type. The laterally confined film is in equilibrium with the bulk fluid that is well into the liquid regime of its phase diagram. Monte Carlo simulations are conducted at constant chemical potential, temperature, and V=Ah, where A is the lateral area and h is the separation between the walls. One and two layers of fluid freeze as h increases. The one layer fluid has a triangular lattice, while the two layer fluid exhibits first a square lattice and then a triangular lattice with increasing surface separation. In contrast to previous studies, solidlike order is induced primarily by the strong fluid-solid interaction and is largely a function of pore width. A shift in the relative alignment of the surfaces perturbs the solidlike fluid structure but does not cause the sudden shear melting transition associated with epitaxial alignment of the fluid atoms with the surface. There is a correlation between the shear stress calculated in the computer experiments and that measured in Surface Forces Apparatus experiments.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 464: Symposium FF – Dynamics in Small Confining Systems III , 1996 , 115
Copyright
Copyright © Materials Research Society 1997

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References

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