Effect of magnetic nanoparticles with various geometrical shapes on morphology and dielectric properties of nanodispersions of nematic liquid crystal in polymer matrix

• Published in: Semiconductor Physics Quantum Electronics & Optoelectronics
• Date: 2013
• Main Authors: Kopčansky, P., Timko, M., Mitrova, Z., Zavisova, V., Koneracka, M., Tomašovičova, N., Tomčo, L., Kovalchuk, O.V., Bykov, V.M., Kovalchuk, T.M., Lad, A.I.
• Format: Article
• Language: English
• Published: Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України 2013
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/117725
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Effect of magnetic nanoparticles with various geometrical
 shapes on morphology and dielectric properties of nanodispersions
 of nematic liquid crystal in polymer matrix / P. Kopcansky, M. Timko, Z. Mitrova, V. Zavisova, M. Koneracka, N. Tomasovicova, L. Tomco, O.V. Kovalchuk, V.M. Bykov, T.M. Kovalchuk, A.I. Lad // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2013. — Т. 16, № 3. — С. 253-258. — Бібліогр.: 12 назв. — англ.

Prepared in this work are dispersions of nematic liquid crystal in polyvinyl
 alcohol with sizes of liquid phase inclusions less than one micrometer (nano-polymer
 dispersed liquid crystal (PDLC)) by changing technology of mixing the components. It
 was shown that, like to the case of earlier examined dispersions with the droplet sizes 6
 to 10 μm (micro-PDLC), the conductivity of nano-PDLC has two components: the ion
 one, which value does not depend on frequency, and the electron one, the value of which
 depends on frequency according to a power law. It was found that the ion conductivity of
 nano-PDLC is three orders of magnitude higher than that for micro-PDLC, and the
 exponent for the electron components of nano-PDLC conductivity is less than that for
 micro-PDLC. It was shown that the spherical and rod-like magnetic nanoparticles (MNs)
 influence in a different manner on the conductivity components of nano-PDLC. If for the
 maximum concentration of spherical MNs 2 * 10⁻³ wt.% the ion conductivity is 2-fold
 increased, then at the same concentration of rod-like MNs the ion conductivity value
 increases by more than one order of magnitude