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

摘要

Prepared in this work are dispersions of nematic liquid crystal in polyvinyludalcohol with sizes of liquid phase inclusions less than one micrometer (nano-polymeruddispersed liquid crystal (PDLC)) by changing technology of mixing the components. Itudwas shown that, like to the case of earlier examined dispersions with the droplet sizes 6udto 10 μm (micro-PDLC), the conductivity of nano-PDLC has two components: the ionudone, which value does not depend on frequency, and the electron one, the value of whichuddepends on frequency according to a power law. It was found that the ion conductivity ofudnano-PDLC is three orders of magnitude higher than that for micro-PDLC, and theudexponent for the electron components of nano-PDLC conductivity is less than that forudmicro-PDLC. It was shown that the spherical and rod-like magnetic nanoparticles (MNs)udinfluence in a different manner on the conductivity components of nano-PDLC. If for theudmaximum concentration of spherical MNs 2 * 10⁻³ wt.% the ion conductivity is 2-foldudincreased, then at the same concentration of rod-like MNs the ion conductivity valueudincreases by more than one order of magnitude