Inverse Mode of Ion-Surfactant Method of Director Reorientation Inside Nematic Droplets

Тип публикации: статья из журнала

Год издания: 2009

Идентификатор DOI: 10.1080/15421400903050814

Ключевые слова: electrically commanded surfaces, ion surfactant, nematic, polymer dispersed liquid crystals, surface anchoring, Applied voltages, Crossed polarizers, Director fields, Director reorientation, Droplet structure, High concentration, Homeotropic, Initial state, Ionic modification, Liquid-crystal droplets, Nematic droplets, Nematic polymer, Surface-active cations, Surface-anchoring, Trimethyl, Ammonium compounds, Cationic surfactants, Crystals, Drop formation, Dyes, Ionization of liquids, Ions, Liquid crystal displays, Liquid crystals, Liquids, Nematic liquid crystals

Аннотация: Inverse mode of a novel electrooptical effect caused by the ionic modification of boundary conditions has been studied for liquid crystal droplets. We have considered the droplets of nematic 5CB doped with cationic surfactant cetyl-trimethyl-ammonium-bromide and dispersed in polyvinyl alcohol. In the initial state the surface anchoring was normal on the whole interface due to the high concentration of homeotropic surfactant. Applied voltage results in the purification of a section of the interface from the surface-active cations thereby restoring here a tangential anchoring and stimulating the significant transformation of droplet structure. At that three different types of director field distribution can be realized within the same droplet. The proper textures of the droplet both in the crossed polarizers and without analyzer are considered.

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Издание

Журнал: MOLECULAR CRYSTALS AND LIQUID CRYSTALS

Выпуск журнала: Vol. 512

Номера страниц: 1998-2003

ISSN журнала: 15421406

Место издания: ABINGDON

Издатель: TAYLOR & FRANCIS LTD

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