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Home Material Sciences Methods for integrated characterization of liquidcrystal nanocomposites

Methods for integrated characterization of liquid-crystal nanocomposites

Description

A set of complementary experimental techniques is developed for characterization of the novel liquid crystal nanocomposites, including mixtures of nematic and cholesteric liquid crystal hosts with single walled or multiwalled carbon nanotubes as a dopant, which may contain also other types of nano and micro particles. The set of techniques comprises spectrophotometry (in particular, measurements of the thermal dependencies of optical activity), differential scanning calorimetry, electrophysical methods (dielectric spectroscopy, conductometry), optical microscopy, selective reflection spectroscopy, other instrumental methods of physicochemical analysis, and a number of singular optics techniques. It allows to estimate for each liquid crystal nanocomposite concerned parameters of its phase transitions, homogeneity and heterostructuring of the phase states it can create, its optical transparency, electrical conductivity and dielectric permittivity dependencies versus applied electrical field (in electro-optical cells, controlled capacitors and other microelectronic and optoelectronic devices), and also time stability of these characteristics. The latter is especially important, as far as the tendency of nanotubes to aggregation is the major problem in development of such nanomaterials: the optimum composition of a liquid crystal material should provide combination of inconsistent parameters (transparency, electric field sensitivity, etc., simultaneously with their high time stability).

Advantages and novelty

The techniques proposed for characterization of the liquid crystal nanocomposites are relatively simple and do not require any special sophisticated equipment. The measurements can be performed using standard equipment, and novelty of proposal lies in original methods developed for preparation of material samples and original measurement procedures, which provide high reliability of the measurement results.

Areas of Application

Novel purposeful materials, based on soft anisotropic hosts filled with anisotropic nanoparticles, designated for information recording, processing and displaying systems and for microelectronics and optoelectronics devices.

Contact Details

Nikolai I. Lebovka; Marat S. Soskin; Lisetski N.I.
Organization: Institute of Physics of NASU; F. D. Ovcharenko Institute of Biocolloidal Chemistry of NASU; Institute for Scintillation Materials of NASU
(+380 44) 424-0378; (+380 44) 525-5563; (+380 57) 341-0161
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