Objective
New stable composite (heterogeneous) liquid crystal (LC) systems are planned to be developed. These will include polymer porous matrices filled with LCs and liquid crystal hosts containing ultra fine particles of different nature and shape: ferromagnetic and antiferromagnetic (Fe2O3, CoO, NiO), organic (collagen, colophony) and inorganic (V2O5), monomolecular fullerenes (C60, C70) and polymolecular (fullerene nanotubes).
As compared to other heterogeneous LC systems, mentioned above composite LCs can possess additional advantages that may lead to advanced applications such as a light-controlling glass, high-information display devices and the possibility of optical recording and storage of information in these materials. To investigate the possible applications of these systems, their structure and the basic electro-/magneto-optical characteristics will be investigated.
This will involve:
(a) Theoretical and experimental studies of the particles structure organisation in LC matrices;
(b) Detailed investigation of the effects of particle nature, structure organisation and parameters (size, shape, aspect ratio) and their dependence on particle concentration, particle surface properties and temperature of the mixture;
(c) Investigation of the effects of polymer nature, the pore volume fraction and size in the case of porous polymer media filled with LCs;
(d) Studies of the phase and structural transitions in composite LC systems.
There will be detailed application work on the following composite LCs properties:
(a) Methods of stabilisation of mixtures of LC + ultra fine particles;
(b) Modelling of the LC director and order parameter spatial distribution near magnetic particles with different boundary conditions;
(c) Modelling and experiment concerning the impact of an external magnetic field on the director and order parameter spatial profiles;
(d) Modelling and experiment concerning the impact of an external electric field on the director and order parameter spatial profiles;
(e) Theory of light scattering in the above-mentioned composite LCs;
(f) Modelling and experimental work concerning the influence of particles nature and properties (e.g. size/shape/aspect ratio/surface preparation) on composite LCs electro-/magneto-optical characteristics (such as transparency, memory effect);
(g) Modelling and experimental work concerning the dielectric, thermodynamic, linear and non-linear optical properties of porous polymers filled with LCs.
The research will answer the following questions:
(a) How do the electro-/magneto-optical response parameters depend on the type and parameters of the composite LCs?
(b) Do the investigated composite LCs have the potential for application in linear and non-linear optical devices?
(c) If the answer is YES what are the optimum parameters for such application?
(d) What are the best steps to translate this knowledge into a new generation of devices?
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Programme(s)
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Coordinator
BS8 1TL Bristol
United Kingdom
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