منابع مشابه
Nematic Liquid-Crystal Colloids
This article provides a concise review of a new state of colloidal matter called nematic liquid-crystal colloids. These colloids are obtained by dispersing microparticles of different shapes in a nematic liquid crystal that acts as a solvent for the dispersed particles. The microparticles induce a local deformation of the liquid crystal, which then generates topological defects and long-range f...
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We describe and analyze laser trapping of small colloidal particles in a nematic liquid crystal, where the index of refraction of colloids is smaller compared to the indices of the liquid crystal. Two mechanisms are identified that are responsible for this anomalous trapping: (i) surface-induced distortion of the birefringent media around the particle, creating a high-index ”cloud” around the c...
متن کاملCellular solid behaviour of liquid crystal colloids 2 . Mechanical properties
This paper presents the results of a rheological study of thermotropic nematic colloids aggregated into cellular structures. Small sterically stabilised PMMA particles dispersed in a liquid crystal matrix densely pack on cell interfaces, but reversibly mix with the matrix when the system is heated above Tni. We obtain a remarkably high elastic modulus, G ′ ≥ 10 5 Pa, which is a nearly linear fu...
متن کاملLiquid Crystal Colloids Studied by THz Time-Domain Spectroscopy
THz time-domain spectroscopy is used to measure the frequency dependent (0.2– 2.0 THz) complex refractive index of a pure liquid crystal (LC), 40-n-pentyl-4-cyanobiphenyl (5CB), and its LC colloids with SiO2 particles. While the refractive index of the pure LC is found to vary markedly due to distinct orientated domains within the sample, the LC colloids provide us with very stable and reproduc...
متن کاملLarge scale structures in liquid crystal/clay colloids
liquid crystal, colloid, SAXS Suspensions of three different clays in K15, a thermotropic liquid crystal have been studied by optical microscopy and small angle X-ray scattering. The three clays were Claytone AF, a surface treated natural montmorillonite, Laponite RD, a synthetic hectorite and mined Sepiolite. The Claytone and Laponite were sterically stabilized whereas Sepiolite formed a relat...
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ژورنال
عنوان ژورنال: Liquid Crystals Today
سال: 2018
ISSN: 1358-314X,1464-5181
DOI: 10.1080/1358314x.2018.1479158