Date

Place

Room G (Room 306)
21. LC Display II
August 19, 2015 (Wednesday)
16:00 ~ 17:35

[21-1]
16:00 ~ 16:25
Title:[Invited] Probing Homogeneity and Appropriateness for Display Applications of Liquid Crystalline Nanocomposites Using Dielectric Spectroscopy
Martin Urbanski and Jan Lagerwall (Univ. of Luxembourg, Luxembourg)
Abstract: Functional composites of nanoparticles dispersed in liquid crystals enjoy high attention due to promising opportunities for both basic science and innovative display applications. Numerous studies revealed that doping nematic liquid crystals with small amounts of spherical nanoparticles can significantly alter the alignment and the electro-optic response of the host. However, these studies draw an inconsistent picture on the benefit of nanoparticle doping on the electro-optic performance of nematics, mainly due to a lack of control over the nanoscale homogeneity of the dispersions. This extent of?compatibility plays a major role for the electro-optical performance of the composite, yet its determination so far required laborious and time-consuming measurements. Our results indicate that the analysis of polarization processes such as interfacial or Maxwell-Wagner-Sillars (MWS) polarization offers a fast and cost-efficient tool to estimate the homogeneity of dispersions on the nanoscale. The presence of polarization processes in the kHz- frequency regime indicates a heterogeneity on the mesoscale and thus an insufficient dispersibility of particles in the liquid crystalline host. Our studies aim to provide a feasible tool to estimate the homogeneity of liquid crystalline nanocomposites and will help to develop reliable design principles for obtaining highly stable nanodispersions for applications.
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