Notizen: Specific Volume Studies on Some Nematic Liquid Crystals
نویسندگان
چکیده
منابع مشابه
Strong Electric Field Effect on Some Nematic Liquid Crystals
In the previous chapter we have described an experimental technique which allows us to measure the local temperature of the sample under the application of a strong electric field.. We have also described setups for electrical impedance measurement and optical studies. In this chapter we present experimental results obtained using these techniques to study the electric field effect on the nemat...
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There are two types of defects in the uniaxial nematic F phase: line defects (disclinations) and point defects (hedgehogs and boojums). These are reviewed at three levels: (i) experimental observations; (ii) topological classification; and (iii) curvature elasticity. The reader is referred to the textbooks on liquid crystals (Chandrasekhar 1992, de Gennes and Prost 1993), defects (Kltman 1983),...
متن کاملMeasurement of Flexoelectric Coefficients of Some Nematic Liquid Crystals
As we have discussed in Chapter I of this thesis, the nematic director is apolar. IIence the usual dielectric coupling with an external electric field depends quadratically on the latter. However, as has been discussed earlier a deformed director field with a splay and/or bend distortion can lead to a flexoelectric polarisation of the medium. The response of liquid crystals to an electric field...
متن کاملFlexoelectric polarization studies in bent-core nematic liquid crystals.
The flexoelectric polarization (Pf) of four bent-core nematic liquid crystals (LCs) has been measured using the pyroelectric effect. Hybrid aligned nematic cells are fabricated for measuring the pyroelectric response over the entire range of the nematic phase. It is found that the magnitude of flexoelectric polarization Pf and the sum of the flexoelectric coefficients |e1+e3| for the bent-core ...
متن کاملDefects in Nematic Liquid Crystals
Defects in liquid crystals are discontinuities in order parameter. In nematic liquid crystals (NLC) two types of stable defects exist: disclination lines and point defects. Defects formation depends on isotropic to nematic phase transition while their stability depends strongly on confining surface properties, surface geometry and presence of external field. Classical Frank’s model of director ...
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ژورنال
عنوان ژورنال: Zeitschrift für Naturforschung A
سال: 1975
ISSN: 1865-7109,0932-0784
DOI: 10.1515/zna-1975-0832