Peculiarities of the Thermal Motion in Crystals Formed by Cetyltrimethylammonium Bromide Molecules

Authors

  • O.M. Alekseev Taras Shevchenko National University of Kyiv, Faculty of Physics
  • M.M. Lazarenko
  • G.O. Puchkovska Institute of Physics, Nat. Acad. of Sci. of Ukraine
  • T.V. Bezrodnaya Institute of Physics, Nat. Acad. of Sci. of Ukraine
  • A.A. Sendzyuk Taras Shevchenko National University of Kyiv, Faculty of Physics

DOI:

https://doi.org/10.15407/ujpe55.9.973

Keywords:

-

Abstract

Phase transformations in CTAB polycrystals are investigated with the use of the thermophysical, dielectric, and spectroscopic techniques. A molecular model of these transformations is proposed. According to this model, the free volume in the intercrystalline layer of CTAB polycrystals starts to grow at 10 °С, and Br− ions bound with the –N(CH3)3 terminal groups increase their mobility. At 55 °С, topological solitons of the “one-unit constriction with 180° reorientation” type appear. They arise at terminal methyl groups, pass by the molecules, and are reflected from–N(CH3)3 groups. In this case, CTAB crystals pass to the orthorhombic rotation-crystalline phase. At 92 °С, topological solitons change the orientation of the terminal –N(CH3)3 groups, which results in the melting of nonpolar aliphatic layers.

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Published

2025-01-22

How to Cite

Alekseev, O., Lazarenko, M., Puchkovska, G., Bezrodnaya, T., & Sendzyuk, A. (2025). Peculiarities of the Thermal Motion in Crystals Formed by Cetyltrimethylammonium Bromide Molecules. Ukrainian Journal of Physics, 55(9), 973. https://doi.org/10.15407/ujpe55.9.973

Issue

Vol. 55 No. 9 (2010)

Section

Soft matter

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