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Structure and Rheology of Some Bent Core Liquid Crystals

Bailey, Christopher Allen
http://rave.ohiolink.edu/etdc/view?acc_num=kent1216229977

Abstract Details

2008, PHD, Kent State University, College of Arts and Sciences / Chemical Physics.
Liquid crystal phases composed of bent core molecules have been a fascinating topic in soft matter physics over the last decade. These materials which can form spontaneous polarizations (ferroelectricity) and chiral symmetry breaking with non-chiral molecules incited much interest in the scientific community. Since these early days, much research has been done on the characterization of these phases and their physical properties. In this work, we studied some of these properties by measuring the structural and viscous behavior using small amounts of material. The non-Newtonian flow characteristics of several bent core liquid crystals are characterized using a nanoliter viscometer. We show that many of these phases have viscoelastic behaviors which are fundamentally different from those observed in classical rod like liquid crystals. Finally, we studied the elasticity and dynamics of freestanding filaments which are stable structures in some bent core smectic phases. Characterization of their elasticity by resonance measurements and other techniques are in agreement with models designed to explain their microscopic smectic structures. We show that their viscosity, filament structure and stability, and microscopic structures can be understood by considering the role of steric interactions between molecules and the frustration thereof.
Antal Jakli, PhD (Advisor)
Peter Palffy-Muhoray, PhD (Committee Member)
Eugene Gartland Jr., PhD (Committee Member)
Jonathan Selinger, PhD (Committee Member)
Samuel Sprunt, PhD (Committee Member)
244 p.
Physics
liquid crystals; bent core liquid crystals; filaments; rheology; nanoliter viscometer

Recommended Citations

Citations

  • Bailey, C. A. (2008). Structure and Rheology of Some Bent Core Liquid Crystals [Doctoral dissertation, Kent State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=kent1216229977

    APA Style (7th edition)

  • Bailey, Christopher. Structure and Rheology of Some Bent Core Liquid Crystals. 2008. Kent State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=kent1216229977.

    MLA Style (8th edition)

  • Bailey, Christopher. "Structure and Rheology of Some Bent Core Liquid Crystals." Doctoral dissertation, Kent State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=kent1216229977

    Chicago Manual of Style (17th edition)

kent1216229977
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© 2008, all rights reserved.
This open access ETD is published by Kent State University and OhioLINK.