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Introduction
Author(s) -
Cole Andrew J.,
Devinsky Orrin
Publication year - 2004
Publication title -
epilepsia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.687
H-Index - 191
eISSN - 1528-1167
pISSN - 0013-9580
DOI - 10.1111/j.0013-9580.2004.04001.x
Subject(s) - epilepsy , neuroimaging , presentation (obstetrics) , magnetic resonance imaging , psychology , medical physics , medicine , neuroscience , cognitive science , radiology
The liquid crystalline state was first observed by Reinitzer [1] in 1888. Liquid crystals are intermediate states between the ordered crystalline phase and the disordered isotropic liquid phase. They possess a long-range order as in crystals and mobility as in liquids, which give rise to anisotropic physical properties. The fundamental requirement for any substance to exhibit a liquid crystalline state is the shape anisotropy of the constituent molecules. On the basis of this property, three types of thermotropic liquid crystals have been realized which are obtained by the action of heat.