Impact of ferroelectric and superparaelectric nanoparticles on phase transitions and dynamics in nematic liquid crystals

Szymon Starzonek, Sylwester J. Rzoska, Aleksandra Drozd-Rzoska, Krzysztof Czupryński, and Samo Kralj
Phys. Rev. E 96, 022705 – Published 9 August 2017

Abstract

Results of broadband dielectric spectroscopy (BDS) studies of pure liquid crystalline (4-pentyloxy-4-biphenylcarbonitryle) 5OCB and its nanocolloids with BaTiO3 nanoparticles (NPs) under varying pressure and temperature are presented. The notable impact of NPs on phase transitions and dynamics was found. Particularly strong impact on pretransitional behavior was observed for relatively low concentrations of NPs, which can be related to the NPs-induced disorder. There are also notable differences between pressure and temperature paths of studies for nanocomposites, absent for the pure LC compound. For instance, tests focused on the translational orientational decoupling via the fractional Debye-Stokes-Einstein relation yielded S=0.71 and S=0.3 for the temperature and pressure paths, respectively: S=1 is for the complete coupling. The possible theoretical frame of observed phenomena is also proposed.

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  • Received 4 March 2017

DOI:https://doi.org/10.1103/PhysRevE.96.022705

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Szymon Starzonek*, Sylwester J. Rzoska, and Aleksandra Drozd-Rzoska

  • Institute of High Pressure Physics of Polish Academy of Sciences, ulica Sokołowska 29/37, 01-142 Warsaw, Poland

Krzysztof Czupryński

  • Military University of Technology, Institute of Chemistry, ulica Kaliskiego 2, 00-908 Warsaw, Poland

Samo Kralj

  • Condensed Matter Physics Department, Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia and Faculty of Natural Sciences and Mathematics, University of Maribor, Koroska 160, 2000 Maribor, Slovenia

  • *starzoneks@unipress.waw.pl

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Issue

Vol. 96, Iss. 2 — August 2017

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