Samo Kralj (Author), Zlatko Bradač (Author), Vlad Popa-Nita (Author)

Abstract

We study the influence of nanoparticles (NPs) on liquid crystal (LC) ordering. As regards the structural ordering we consider NPs as a source of a quenched random field. Roughly such a situation is encountered in mixtures of LCs and aerosil NPs (aerosil NPs are spherular ones). Using the semi-microscopic lattice model and Brownian molecular simulation we show that after a quench from the isotropic phase a quasi-stable domain pattern forms. The characteristic size of an average domain is inversely proportional to the concentration of NPs, and domain patterns exhibit memory effects. In the study of the phase behaviour we limit consideration to NPs resembling LC molecules. A Landau-type free energy expression is derived for the mixture, originating from the Maier-Saupe molecular approach. We show that the resulting phase behaviour exhibits the slave-master behaviour as the temperature or pressure is varied.

Keywords

tekoči kristali;nematični kristali;nanodelci;vplivi nanodelcev;

Data

Language: English
Year of publishing:
Typology: 1.08 - Published Scientific Conference Contribution
Organization: UM FNM - Faculty of Natural Sciences and Mathematics
UDC: 532.783
COBISS: 16068104 Link will open in a new window
ISSN: 0953-8984
Views: 1419
Downloads: 105
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Other data

Secondary language: English
Secondary keywords: liquid crystals;nematic crystals;nanoparticles;influences;liquid crystal ordering;
URN: URN:SI:UM:
Pages: str. 244112-1-244112-7
Volume: ǂNo. ǂ24
Issue: ǂVol. ǂ20
Chronology: 2008
DOI: 10.1088/0953-8984/20/24/244112
ID: 8724029