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Abstract <p>In this work, the relaxation process in mixtures of a nematic liquid crystal matrix with additives of azochromophores and CdSe/ZnS quantum dots is analyzed. The thermally initiated mesophase—isotropic liquid phase transition showed that the activation energy of this process increases almost equally upon the addition of AX-7 or AX-8 in an amount of 10 wt %. However, the photoinduced phase transition into isotropic state, analyzed by dielectric spectroscopy, demonstrates a significant difference when different azochromophores are present in the system as confirmed by activation energy values. This effect is associated with changes in the ratio of <i>trans</i>–<i>cis</i>-isomers. IR-spectroscopy revealed the unexpecting predominance of <i>cis</i>-isomers in AX-7, while <i>trans</i>-isomers are typical for AX-8. This difference was explained by a change in the distribution of electron density in the azochromophore fragments, taking into account the influence of aromatic ring substituents.</p>

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Peculiarities of the Relaxation Behavior of Nematic Liquid Crystal Compositions with Azochromophores and Quantum Dots

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • A. S. Merekalov,
  • O. N. Karpov,
  • Yu. A. Egorov,
  • A. S. Plotnikova,
  • S. A. Legkov,
  • G. N. Bondarenko,
  • R. V. Talroze

摘要

Abstract

In this work, the relaxation process in mixtures of a nematic liquid crystal matrix with additives of azochromophores and CdSe/ZnS quantum dots is analyzed. The thermally initiated mesophase—isotropic liquid phase transition showed that the activation energy of this process increases almost equally upon the addition of AX-7 or AX-8 in an amount of 10 wt %. However, the photoinduced phase transition into isotropic state, analyzed by dielectric spectroscopy, demonstrates a significant difference when different azochromophores are present in the system as confirmed by activation energy values. This effect is associated with changes in the ratio of trans–cis-isomers. IR-spectroscopy revealed the unexpecting predominance of cis-isomers in AX-7, while trans-isomers are typical for AX-8. This difference was explained by a change in the distribution of electron density in the azochromophore fragments, taking into account the influence of aromatic ring substituents.