Dynamic and Static Light Scattering at Phase Transitions in Liquid Crystal Confined Into Porous Polymer Film

Abstract

Autocorrelation function g 2 () and intensity (I) of the depolarized scattered light were obtained at the study of a dynamic light scattering from the composite liquid crystal (LC) material, consisting of porous polyethylenterephthalate (PET) film filled with oсtylcyanobiphenyl (8CB Автокорреляционная функция g 2 (τ) и интенсивность (I) деполяризованного рассеянного света были получены при исследовании динамического рассеяния света от композиционного жидкокристаллического (ЖК) материала, состоящего из пористой пленки полиэтилентерафтолата (ПЭТ), заполненной октилцианобифенилом (8CB). Одновременный анализ данных параметров позволил получить температуры

Photon Correlation Spectroscopy for Investigation of Viscous-Elastic Properties of Shock-Free Ferroelectric Liquid Crystal

“…Among number of experimental methods used for measurement of elastic and viscous properties of liquid crystals (LC), the photon correlation spectroscopy showed essential advantages as a universal field free tool for studying liquid crystal systems of different types, such as plane layers of liquid crystals [1,2], porous glasses [3] and polymer films filled with LC [4,5]. This technique is based on study of frequency spectrum of dynamic light scattering (DLS) induced by thermal fluctuations of director which is described in terms of the autocorrelation function of the scattered intensity [6].…”

“…Moreover, it also provides determination of the polar and azimuth anchoring strengths, which characterize the interaction of nematic LC with a solid surface [7,8]. Application of this technique to porous glasses [3] and porous polymer films [5] made it possible to extract unique information on viscous properties of NLC at strong confinement.…”