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Theoretical Studies of Nonuniform Orientational Order in Liquid Crystals and Active Particles.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Theoretical Studies of Nonuniform Orientational Order in Liquid Crystals and Active Particles./
Author:	Duzgun, Ayhan.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
Description:	143 p.
Notes:	Source: Dissertation Abstracts International, Volume: 79-07(E), Section: B.
Contained By:	Dissertation Abstracts International79-07B(E).
Subject:	Physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10754247
ISBN:	9780355565959

Theoretical Studies of Nonuniform Orientational Order in Liquid Crystals and Active Particles.
Duzgun, Ayhan.

Theoretical Studies of Nonuniform Orientational Order in Liquid Crystals and Active Particles. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 143 p.

Source: Dissertation Abstracts International, Volume: 79-07(E), Section: B.

Thesis (Ph.D.)--Kent State University, 2018.

I investigate three systems that exhibit complex patterns in orientational order, which are controlled by geometry interacting with the dynamics of phase transitions, metastability, and activity. 1. Liquid Crystal Elastomers: Liquid-crystal elastomers are remarkable materials that combine the elastic properties of cross-linked polymer networks with the anisotropy of liquid crystals. Any distortion of the polymer network affects the nematic order of the liquid crystal, and, likewise, any change in the magnitude or direction of the nematic order influences the shape of the elastomer. When elastomers are prepared without any alignment, they develop disordered polydomain structures as they are cooled into the nematic phase. To model these polydomain structures, I develop a dynamic theory for the isotropic-nematic transition in elastomers. 2. Active Brownian Particles: Unlike equilibrium systems, active matter is not governed by the conventional laws of thermodynamics. I perform Langevin dynamics simulations and analytic calculations to explore how systems cross over from equilibrium to active behavior as the activity is increased. Based on these results, I calculate how the pressure depends on wall curvature, and hence make analytic predictions for the motion of curved tracers and other effects of confinement in active matter systems. 3. Skyrmions in Liquid Crystals: Skyrmions are localized topological defects in the orientation of an order parameter field, without a singularity in the magnitude of the field. For many years, such defects have been studied in the context of chiral liquid crystals---for example, as bubbles in a confined cholesteric phase or as double-twist tubes in a blue phase. More recently, skyrmions have been investigated extensively in the context of chiral magnets. In this project, I compare skyrmions in chiral liquid crystals with the analogous magnetic defects. Through simulations based on the nematic order tensor, I model both isolated skyrmions and periodic defect lattices.

ISBN: 9780355565959Subjects--Topical Terms:

564049
Physics.

Theoretical Studies of Nonuniform Orientational Order in Liquid Crystals and Active Particles.
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