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Effects of electric and magnetic fields on the structure of cholesteric liquid crystals
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In this paper, a general method is presented for calculating the structural changes resulting from electric or magnetic fields acting on anisotropy of the anisotropic susceptibility of a liquid crystal.Abstract:
Electric or magnetic fields acting on the anisotropy of the electric or magnetic susceptibility exert torques within a liquid crystal which may compete with the elastic torques determining its internal structure. A general method is presented for calculating the structural changes thus produced. Two examples are given, and the field strength for the effects is estimated to be 105 V/cm or 105 G. Two experiments are suggested to test the theory.read more
Citations
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Physics of liquid crystals
TL;DR: In this article, the physical properties of nematic, cholesteric, and smectic liquid crystals are discussed and a wide variety of phenomena in liquid crystals, including elastic distortions, disclinations, flow properties, fluctuations, light scattering, wave propagation, nuclear magnetic resonance, effects of magnetic and electric fields, electrohydrodynamics, and optical properties.
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Electrically Tunable Selective Reflection of Light from Ultraviolet to Visible and Infrared by Heliconical Cholesterics
Jie Xiang,Yannian Li,Quan Li,Daniel A. Paterson,John Storey,Corrie T. Imrie,Oleg D. Lavrentovich +6 more
TL;DR: Electrical tuning of selective reflection of light is achieved in a very broad spectral range from ultraviolet to visible and infrared by an oblique helicoidal state of a cholesteric liquid crystal in a wide temperature range (including room temperature).
Journal ArticleDOI
Cholesteric Phase in Virus Suspensions
Zvonimir Dogic,Seth Fraden +1 more
TL;DR: In this paper, the cholesteric pitch and twist elastic constant (K22) were measured in monodisperse suspensions of the rodlike virus filamentous bacteriophage fd.
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Bioinspired Stimuli-Responsive Color-Changing Systems.
Golnaz Isapour,Marco Lattuada +1 more
TL;DR: An updated overview of the literature on bioinspired stimuli‐responsive color‐changing systems is provided, and a classification of the different solutions proposed is given, based on the stimuli used to trigger the color‐ changing effect.
References
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Journal ArticleDOI
Rotatory power and other optical properties of certain liquid crystals
TL;DR: In this paper, it is shown how these properties can be explained by the assumption that the molecules are arranged in a special way, so that the electrical axes rotate screw-like.
Journal ArticleDOI
Relation of nematic to cholesteric mesophases
Journal ArticleDOI
Effects of Electric Fields on Cholesterol Nonanoate Liquid Crystals
Abstract: Effects of strong electric fields upon cholesteric liquid crystals have been studied. Increased intensity of light selectively scattered from the plane texture at d.c. and up to 3 kc have been found, as well as a temperature-dependent minimum in the average intensity as a function of frequency. An effect somewhat like hysteresis is shown by retention of the acquired brightness in the absence of field. Curious effects such as three classes of dark spots, some of which metamorphose into bars, light maltese crosses, and bright cross-hatchings are regularly observed. These effects taken together with the conditions of their appearance imply strong alignment such that the selective reflection of the cholesteric mesophase is greatly enhanced by the increased ordering of the planes of reflection within the mosphase. The complicated a.c. electric field effects are given a detailed, qualitative explanation.