Physicochemical study of silica colloidal liquid crystal

Nursuraya Zainal, Che Rozid Mamat

Abstract


A colloidal liquid crystal was prepared by the self-assembly of silica into a nematic liquid crystal, 4-cyano-4'-pentylbiphenyl (5CB). This silica colloidal liquid crystal has massive potential for use in electro-optical device applications such as in developing liquid crystal displays (LCDs). Liquid crystal dispersed with silica have been intensively studied and believed to improve the properties and performance of liquid crystal host. The phases and morphologies of this silica colloidal liquid crystal for two different concentrations, namely 5 and 10 w/v% were characterized by three different techniques which are infrared spectroscopy (IR), polarized optical microscopy (POM) and Raman spectroscopy. IR spectrum showed the functional group of silica colloidal liquid crystal and successfully proved that the 5CB and silica are mixed physically where there is no disruption of the chemical bond of materials. POM revealed the existence of liquid crystal phases which are nematic and isotropic phases. As a result, the presence of Schlieren texture of two and four brushes indicate the nematic liquid crystalline phase during the early stage of cooling process. Raman spectroscopy investigated the chemical fingerprints of the pure liquid crystal and silica liquid crystal that finally been identified.

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References


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