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Processing and characterisation of liquid crystal nanocomposites

Chung, Ka Fai (2013)
M.Res. thesis, University of Birmingham.

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Abstract

Doping nanoparticles such as carbon nanotubes (CNTs) in LC material is one of the methods to improve the display performance. The attraction of the hybrid system is not only the advance in EO performance, but also the alignment of CNTs. The disordered nature of CNTs makes it hard to expose the excellent properties and the self-ordered nature of LC material perfectly fit in this problem. Moreover, with LC acts as host, the CNTs orientation can be manipulated by external electric or magnetic field. On the other hand, there are doubts or questions on the stability of the nanocomposites and optimization of the sonication parameters and CNTs concentration that needed to be addressed before the mass production in the industry.

In this thesis, liquid crystal material 5CB and multi-walled carbon nanotubes (MWCNTs) hybrid system was studied. Results showed that the fastest response time of the nanocomposite was achieved in the following conditions: 1. Short sonication time (5mins) with prior stirring. 2. Sonication under ice bath. 3. CNTs concentration at about 0.02wt %. Experiment showed that a maximum reduction of 29% in total response time of the nanocomposite can be achieved. However, prolong processing and inappropriate temperature treatments are very likely to bring negative effect on the microstructure of LC nanocomposites.

Type of Work:M.Res. thesis.
Supervisor(s):Chang, I. T. H. and Kukureka, Stephen N.
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Metallurgy and Materials
Subjects:TA Engineering (General). Civil engineering (General)
Institution:University of Birmingham
ID Code:4141
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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