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- W2000304135 abstract "The results of dielectric measurements for a mixture of chiral liquid crystal 5*CB with ${mathrm{Al}}_{2}{mathrm{O}}_{3}$ powder are given. A detailed analysis of the dielectric spectra enabled us to obtain information about the influence of the ${mathrm{Al}}_{2}{mathrm{O}}_{3}$ grains on the dynamics of the liquid-crystal molecules. Numerical analysis of the results confirmed that the dielectric spectra obtained are complex. In the low-frequency range they are dominated by ionic conductivity while in the whole frequency range two maxima appear. One of them is related to rotations of the molecules around their short axes. In the isotropic phase the corresponding values of the relaxation times are very close to those for bulk 5*CB. Relaxation and conduction processes can be described by a Vogel-Fulcher-Tammann function. In the cholesteric phase, rotation of 5*CB molecules trapped in the pores of ${mathrm{Al}}_{2}{mathrm{O}}_{3}$ occurs. Another relaxation process results from dynamics of 5*CB molecules anchoring to ${mathrm{Al}}_{2}{mathrm{O}}_{3}$ grains. The temperature dependence of relaxation times related to this process is nonmonotonic." @default.
- W2000304135 created "2016-06-24" @default.
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- W2000304135 date "2011-06-24" @default.
- W2000304135 modified "2023-10-18" @default.
- W2000304135 title "Role of surface interactions in the dynamics of chiral isopentylcyanobiphenyl mixed with Al2O3powder as studied by dielectric spectroscopy: Numerical analysis" @default.
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- W2000304135 doi "https://doi.org/10.1103/physreve.83.061708" @default.
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