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Artificial Microscopic Structures in Nematic Liquid Crystals Created by Patterned Photoalignment And Controlled Confinement: Instrumentation, Fabrication and Characterization

2015, PHD, Kent State University, College of Arts and Sciences / Department of Chemical Physics.
Disclination lines play a decisive role in determining the equilibrium structures of topologically constrained liquid crystal systems including cholesteric blue phases, twist grain boundary phases and liquid crystal colloids. The extra energy associated with disclinations is key to stabilizing one particular director structure over another, yet our knowledge of disclination energetics is limited as are characterization methods. In this work, we detail our approach which has focused onbuilding versatile one-of-a-kind instruments for studying liquid crystal systems. This work details the development and use of two novel instruments: an automated maskless photoalignment pattern generator (maskless system) and ad ynamic-cell system that allows for the automated mechanical adjustment of the liquid crystal cell thickness, twist angle and temperature. Both instruments were extensively re fined and characterized for maximum performance. In addition, both instruments were designed as versatile platformsfor new research. In this work, we used the maskless system to create novel surface alignments and Pancharatnam-phase devices, and we employed the dynamic-cell system for the generation and characterization of reverse-twist-domain defect loops.
Hiroshi Yokoyama (Advisor)
Philip Bos (Committee Member)
Antal Jakli (Committee Member)
Elizabeth Mann (Committee Member)
Michael Tubergen (Committee Member)
170 p.

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Culbreath, C. (2015). Artificial Microscopic Structures in Nematic Liquid Crystals Created by Patterned Photoalignment And Controlled Confinement: Instrumentation, Fabrication and Characterization. (Electronic Thesis or Dissertation). Retrieved from https://etd.ohiolink.edu/

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Culbreath, Christopher. "Artificial Microscopic Structures in Nematic Liquid Crystals Created by Patterned Photoalignment And Controlled Confinement: Instrumentation, Fabrication and Characterization." Electronic Thesis or Dissertation. Kent State University, 2015. OhioLINK Electronic Theses and Dissertations Center. 11 Dec 2017.

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Culbreath, Christopher "Artificial Microscopic Structures in Nematic Liquid Crystals Created by Patterned Photoalignment And Controlled Confinement: Instrumentation, Fabrication and Characterization." Electronic Thesis or Dissertation. Kent State University, 2015. https://etd.ohiolink.edu/

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