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Title: Studies on Liquid Crystals and Nanocomposites at Interfaces
Researcher: Choudhary, Keerti
Guide(s): Manjuladevi, V.
Keywords: Physics, Liquid Crystals, Nanocomposites
University: Birla Institute of Technology and Science
Completed Date: 2016
Abstract: Liquid crystals (LCs) are the fourth state of matter whose order lies between that of 3-dimensioanlly (3D) ordered solids and completely disordered fluids. There are two types of LCs: thermotropic and lyotropic LCs. The thermotropic LCs exhibit mesophases as a function of temperature whereas lyotropic LCs exhibit mesophases as a function of concentration, ion-contents, pH, temperature and humidity. The thermotropic mesophases are dependent on various factors including the molecular interaction and molecular shape anisotropy. Several thermotropic LCs are amphiphilic in nature and can form stable Langmuir monolayer (LM). LM is a stable film of single layer of amphiphilic molecules at the air-water (A/W) interface. A single layer of molecules onto the substrate can be considered as thin film. The thin films of LC exhibit interesting properties. The surface to volume ratio of a material increases enormously when spread on to a substrate to form thin film. Such huge increase in surface-to-volume ratio increases the activities of the material enormously and thereby the material properties like catalysis, reactivity, adhesion, etc are enhanced remarkably. Such changes in the material properties in the state of thin films promises a wide range of applications starting from the basic science research to various device fabrications. The surface morphology and the nanostructure in the thin film can govern the growth of the bulk material deposited over it. Therefore, this provides an opportunity to alter the alignment of bulk LC molecules by altering the morphology and functionality of the interfacial layer. The formation of nanostructure in the thin film is governed by molecular interaction and external parameters like temperature, surface density etc. The surface can be patterned and the nanostructures can be controlled by an appropriate choice of thin film forming materials e.g. LCs, nanomaterials and its nanocomposites. The LC based devices consist of alignment layer for aligning the bulk LC materials within a confined
Pagination: 180p.
Appears in Departments:Physics

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