On the Molecular Theory of Smectic-A Liquid Crystals
The intermolecular interactions leading to the various types of smectic-A phase are considered both for effectively symmetric and for asymmetric molecules. At least a qualitative understanding of the molecular organization in the various phases can be obtained by combining the tendency of aromatic and aliphatic parts to segregate with optimal packing and minimal dipolar repulsions. In particular, it is shown that probably two rather different ways of molecular ordering may lead to a smectic-A phase with a period approximately equal to the molecular length.
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