Hard Rod Model of the Nematic-Isotropic Phase Transition
In the previous chapters we have seen how an anisotropic, attractive interaction between the molecules of the form P 2(cos θ12) can give rise to a first-order nematic-isotropic phase transition. The origin of the anisotropy lies in the fact that almost all the liquid-crystal molecules are elongated, rod-like, and fairly rigid (at least in the central portion of the molecule). It is clear, however, that besides the anisotropic attractive interaction there must also be an anisotropic steric interaction that is due to the impenetrability of the molecules.
KeywordsSteric Interaction Steric Repulsion Parallel Alignment Angular Integral Angular Distribution Function
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