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- W1998382942 abstract "A liquid crystal is an optically anisotropic liquid. One can classify this state of matter as intermediate between liquid and solid. These liquids are formed mainly by organic compounds with elongated rod-like shaped molecules, and can be characterized by a long-range order of the molecular long axis. We present the basis theories for both elastic and hydrodynamic behavior. The elasticity concerns the orientational order of the optical axis (e.g. the mean direction of the molecular long axis) and, the hydrodynamics, the coupling of this order with flow-velocity gradient. With the help of these theories, we can explain the strong light diffusion observed in liquid crystals. The intensity and the frequency spectra of the light scattered by thermal fluctuation of the optical axis give information about viscosity coefficients and elastic constants. The most important features of these phases are (i) their optical anisotropy and (ii) the coupling of this anisotropy with an electric or magnetic field, or with a flow instability. In spite of the turbid aspect, the spectacular optical properties, a very important birefringence and for a given type a strong rotary power, can be used in several applications such as display systems, medical diagnosis and thermal control of electronic systems, We also briefly analyse the chemical nature and the stability of the compounds which give this particular state of matter." @default.
- W1998382942 created "2016-06-24" @default.
- W1998382942 creator A5050145652 @default.
- W1998382942 date "1973-01-01" @default.
- W1998382942 modified "2023-09-23" @default.
- W1998382942 title "Les propriétés des cristaux liquides et leurs applications" @default.
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- W1998382942 doi "https://doi.org/10.1016/0079-6786(73)90010-1" @default.
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