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The Discontinuity of the Isotropic — Masophase Transition in N-Cyanobiphenyls Homologous Series from 4CB to 14CB. Nonlinear Dielectric Effect (NDE) Studies

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Nonlinear Dielectric Phenomena in Complex Liquids

Part of the book series: NATO Science Series II: Mathematics, Physics and Chemistry ((NAII,volume 157))

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Abstract

Results of studies of the static nonlinear dielectric effect (NDE) in the homologous series of 4-cyano-4-n-alkylbiphenyls (nCB, from n=3 to n=14), exhibiting both isotropic — nematic (I-N) and isotropicsmectic A (I-SmA) phase transitions, are presented. Tests were conducted in the isotropic phase where the reciprocal of NDE shows a linear dependence vs. temperature or pressure, also in the immediate vicinity of the clearing point. It was found that the discontinuity (ΔT) of the isotropic — mesophase transition increases with the length of the alkyl-chain in the nCB molecule, from 0.7 K (4CB) to ca. 11K (14CB). Regarding the influence of pressure, it continuously increases the value of ΔL(P) for the case of the I-N transitions, as shown for 5CB up to P=275MPa. For the the I-SmA transition discontinuity first drops down to ΔT(P) min≈(1/2)[ΔT(0.1MPa)] and next strongly increases with pressure rising up to P=375 MPa.

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Authors and Affiliations

  1. Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007, Katowice, Poland

    Aleksandra Drozd-Rzoska

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  1. Aleksandra Drozd-Rzoska
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Editors and Affiliations

  1. Department of Biophysics and Molecular Physics, Institute of Physics, Silesian University, Katowice, Poland

    Sylwester J. Rzoska

  2. Odessa State Academy of Refrigeration, Odessa, Ukraine

    Vitaly P. Zhelezny

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© 2004 Kluwer Academic Publishers

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Drozd-Rzoska, A. (2004). The Discontinuity of the Isotropic — Masophase Transition in N-Cyanobiphenyls Homologous Series from 4CB to 14CB. Nonlinear Dielectric Effect (NDE) Studies. In: Rzoska, S.J., Zhelezny, V.P. (eds) Nonlinear Dielectric Phenomena in Complex Liquids. NATO Science Series II: Mathematics, Physics and Chemistry, vol 157. Springer, Dordrecht. https://doi.org/10.1007/1-4020-2704-4_18

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