Leaw, W. L. and Mamat, C. R. and Triwahyono, S. and Jalil, A. A. and Bidin, N. (2016) Liquid crystal physical gel formed by cholesteryl stearate for light scattering display material. Journal of Colloid and Interface Science, 483 . pp. 41-48. ISSN 0021-9797
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Abstract
A liquid crystal physical gel was prepared by the self-assembly of cholesteryl stearate in a nematic liquid crystal, 4-cyano-4′-pentylbiphenyl. The electro-optical properties were tuned by varying the gelator concentration and the gelation conditions. Polarized optical microscopy revealed that cholesteric cholesteryl stearate induced chiral nematic phase in 4-cyano-4′-pentylbiphenyl during the gelation process. As a result, a plate-like gel structure consisting of spherical micropores was formed, as observed by scanning electron microscopy. Electron spin resonance spectroscopy showed that the liquid crystal director orientations in these macrophase-separated structures were massively randomised. For these reasons, the liquid crystal physical gel generated a strong light scattering effect. For 48.0 wt% cholesteryl stearate gelled 4-cyano-4′-pentylbiphenyl, the turbid appearance could be switched to a transparent state using a 5.0 V alternating current. The response time was about 3.7 μs. This liquid crystal physical gel has potential for use in light scattering electro-optical displays.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Crystal orientation, Gelation, Light scattering, Liquid crystals, Liquids, Magnetic moments, Nematic liquid crystals, Optical properties, Scanning electron microscopy, Self assembly, Alternating current, Chiral nematic phase, Cholesteryl stearate, Director orientation, Electrooptical properties, Macrophase-separated structures, Physical gel, Polarized optical microscopy, Electron spin resonance spectroscopy, cholesteryl stearate, stearic acid, unclassified drug, Article, chemical structure, chirality, electron spin resonance, gel, light scattering, liquid crystal, optics, phase transition, priority journal, response time, scanning electron microscopy |
| Subjects: | Q Science > QD Chemistry |
| Divisions: | Science |
| ID Code: | 71823 |
| Deposited By: | Narimah Nawil |
| Deposited On: | 16 Nov 2017 05:39 |
| Last Modified: | 16 Nov 2017 05:39 |
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