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Reorientational Motion and Phase Transitions of Cyclohexane in Restricted Geometries

Published online by Cambridge University Press:  21 February 2011

T. W. Zerda  and
Yong Shao
T. W. Zerda
Affiliation:
Texas Christian University, Physics Department, P. O. Box 32915, Fort Worth, TX 76129
Yong Shao
Affiliation:
Texas Christian University, Physics Department, P. O. Box 32915, Fort Worth, TX 76129
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Abstract

Rotational motion of cyclohexane in the liquid and the solid plastic phase is studied using Raman light scattering. The results are compared with molecular dynamics simulations run for model pores of diameters similar to those used in the experiment. The presence of the surface layer and its effect on the relaxation times is discussed. The temperature of the solid-solid phase transition is determined from the analysis of the ν21 band shape. It is shown that the depression of the cubic to monoclinic phase transition depends on the pore diameter and is different for modified and unmodified surfaces. It is suggested that molecules near the pore walls form the amorphous structure and only molecules near the center of the pore form crystallographic structure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 371
Copyright
Copyright © Materials Research Society 1998

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References

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