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Liquid Crystal Physical Gel Formed by Cholesteryl Stearate for Light Scattering Display Material

Liquid Crystal Physical Gel Formed by Cholesteryl Stearate for Light Scattering Display Material

W L Leaw, C R Mamat, S Triwahyono, A A Jalil, N Bidin

J Colloid Interface Sci. 2016 Dec 1;483:41-48.

PMID: 27552412

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 48.0wt% cholesteryl stearate gelled 4-cyano-4'-pentylbiphenyl, the turbid appearance could be switched to a transparent state using a 5.0V alternating current. The response time was about 3.7μs. This liquid crystal physical gel has potential for use in light scattering electro-optical displays.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP35602698	Cholesteryl stearate		35602-69-8	Price

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