Texture transformation in nematic droplets caused by ionic modification of boundary conditions

Тип публикации: статья из журнала

Год издания: 2008

Идентификатор DOI: 10.1080/15421400802219189

Ключевые слова: electrically commanded surfaces, ions, nematic, polymer dispersed liquid crystals, surface anchoring, surfactants, Ammonium compounds, Boundary value problems, Drop formation, Drops, Electric fields, Electromagnetic field theory, Electromagnetic fields, Fluid mechanics, Ionization of liquids, Light sources, Liquid crystal displays, Liquid crystals, Liquid films, Plastic films, Polymer films, Powders, Textures, Boundary conditioning, Cetyl-trimethyl-ammonium, Controlled modification, Homeotropic, Ionic modifications, LC molecules, Liquid-crystal droplets, Nematic droplets, Orientational effects, Polymer-dispersed liquid-crystal films, Surface modifications, Texture patterns, Texture transformation, Two types, Boundary conditions

Аннотация: The novel orientational effects caused by the electrically controlled modification of surface anchoring have been considered in liquid crystal droplets. The polymer dispersed liquid crystal films based on nematic 5CB doped with ion-forming cetyl-trimethyl-ammonium-bromide (CTAB) have been tested. Under the action of electric field the surface-active CTA(+) ions in nematic droplets shift towards the cathode. This displacement can alter dramatically the boundary conditions at the part of interface. Two types of ion-induced surface modification are possible: when the anchoring of LC molecules change from the tangential one to the homeotropic and vice-versa. Both variants have been considered as well as the resultant transformation of texture patterns and the proper director configurations within the nematic droplets.

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Издание

Журнал: MOLECULAR CRYSTALS AND LIQUID CRYSTALS

Выпуск журнала: Vol. 489

Номера страниц: 273-279

ISSN журнала: 15421406

Место издания: ABINGDON

Издатель: TAYLOR & FRANCIS LTD

Авторы

  • Zyryanov V.Ya. (Siberian Fed Univ, LV Kirensky Phys Inst, Krasnoyarsk Sci Ctr, SB RAS, Krasnoyarsk 660036, Russia)
  • Krakhalev M.N. (Siberian Fed Univ, LV Kirensky Phys Inst, Krasnoyarsk Sci Ctr, SB RAS, Krasnoyarsk 660036, Russia)
  • Prishchepa O.O. (Siberian Fed Univ, LV Kirensky Phys Inst, Krasnoyarsk Sci Ctr, SB RAS, Krasnoyarsk 660036, Russia)

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