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Dispersions of nanoparticles in liquid crystals for new functional materials

Work number - M 18 AWARDED

Author: Prodanov M.F.

Presented by the State Scientific Institution "Institute for Single Crystals" NAS of Ukraine."

The aim of the work was obtaining and studying of the true semiconductor and magnetic nanoparticles colloids in liquid crystal media, which is a prerequisite for the further promotion of basic research and the development of practical applications of these new composite materials. The task is solved by the development of specific dendritic modifiers of various molecular architectures for which the preparative methods of synthesis have been proposed, alternative synthetic ways have been compared, and the properties have been investigated.

A number of fundamental results on influence of molecular architecture of nanoparticles organic shell on morphology and stability of the dispersions in liquid crystals and conductive organic polymer are obtained. A model for the dispersion of spherical nanoparticles stabilized with different ligands and combinations thereof, in the liquid crystal medium is proposed. Optimal architecture of nanoparticles organic shell allows obtaining stable colloids of spherical magnetic and semiconductor nanoparticles in liquid crystals.

Dispersion of ferromagnetic nanoparticle with the developed shell architecture in a liquid crystal results in a hybrid liquid crystalline material that exhibits the properties of a magnetic fluid and has an order of higher magnitude of sensitivity to external magnetic field as compared with pure liquid crystal. It is shown that the dendritic phosphonic acids are an effective tool for controlling the distribution of quantum dots in conductive organic polymers. The prospect of such nanocomposites for use in light-emitting and photovoltaic devices is shown. Effective use of advanced methods of organic chemistry, nanochemistry and liquid crystal materials science has allowed the author to develop the way to stabilization of colloidal nanoparticles in anisotropic organic media thereby opening wide opportunities for studying of a number of promising hybrid materials.

The priority results of the work series are important for organic chemistry, material science, liquid crystal technology, photonics, and nanotechnology. Some of the obtained materials have a real prospect of practical application in display technology and photovoltaic; the revealed patterns of influence of dispersions stabilizers on their distribution in the liquid crystal media can be used for further design and production of novel multifunctional («smart») materials employing the unique properties of ensembles of inorganic nanoparticles.

Publications. It is included 19 works into the series of scientific works. In particular, 7 articles published in the period from 2012 to 2014 in leading international journals referred by Scopus database, 1 monograph and 11 abstracts in the proceedings of international conferences. The number of citations of the articles included in the series of works: 46. The total impact factor of the articles: 12.57.