smectic phase
Quick Summary
In nematic arrangements the crystals are randomly positioned with all their long axes pointing in essentially the same direction, given by a vector known as the director. In smectic arrangements the crystals are further constrained to parallel planes; in smectic A the director is perpendicular to these planes, while in smectic C the director is at some other angle to the planes.
The smectic phase is a state of matter found in liquid crystals. In this phase, molecules are arranged in layers, with their long axes parallel within each layer. These layers are either perpendicular or slightly inclined to the plane of the layer itself.1
Liquid crystals exhibit properties of both liquids and crystalline solids. They can flow like liquids but also possess some of the ordered symmetries of solids. The smectic phase is one type of liquid crystal phase, characterized by this layered molecular arrangement. This structure allows for distinct behaviors compared to other liquid crystal phases like the nematic phase, where molecules are aligned but not layered.2
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