Identification of a TGBA liquid crystal phase via its defects
| Autor: | J. Malthête, Yu. A. Nastishin, H. T. Nguyen, Maurice Kleman |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Materials science
Condensed matter physics Cholesteryl nonanoate Biophysics Nanotechnology Surfaces and Interfaces General Chemistry Disclination Microstructure Thermotropic crystal chemistry.chemical_compound chemistry Liquid crystal Phase (matter) General Materials Science Soft matter Biotechnology |
| Zdroj: | The European Physical Journal E. 5:353-357 |
| ISSN: | 1292-8941 |
| DOI: | 10.1007/s101890170066 |
| Popis: | We have shown that cholesteryl nonanoate, a thermotropic compound which is well known to exhibit pretransitional effects at the smectic A (SmA) cholesteric (N*) transition (W.L. McMillan, Phys. Rev. A 4, 1238 (1971); 6, 936 (1972)), has in fact a TGBA phase in between. Our arguments rely on the observation of new TGBA defects, either in Robinson spherulites cooled from the N* phase or in free-standing films. The same new defects can be obtained in a well-documented TGBA phase of a tolane compound. We analyze qualitatively the TGBA defects in both geometries, in particular their relation to the disclination radius of the N* Robinson spherulites. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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