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Relationship Between Phase Transition and the Molecular Structure of Cholesteric Liquid Crystals.
- Source :
-
Molecular Crystals & Liquid Crystals . 2011, Vol. 534, p50-56. 7p. 1 Diagram, 1 Chart, 3 Graphs. - Publication Year :
- 2011
-
Abstract
- The molecular rotation parameters of cholesteric liquid crystals (LCs) are calculated based on their phase transition temperatures using a semi-empirical molecular orbital method. A molecular rotation model is employed to evaluate the correlation between the LC phase transition and their molecular structure. The cholesteric-isotropic phase transition temperature and critical rotational velocity are regularly reduced with increasing molecular length. A novel explanation for the molecular interaction effect on phase transition is proposed. For low-temperature phases, the molecular interaction is strong and plays a key role in the phase transition. In contrast, for high-temperature phases, the molecular rotation effect becomes the important factor for the phase transition. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 15421406
- Volume :
- 534
- Database :
- Academic Search Index
- Journal :
- Molecular Crystals & Liquid Crystals
- Publication Type :
- Academic Journal
- Accession number :
- 57420152
- Full Text :
- https://doi.org/10.1080/15421406.2011.536479