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Phase Behavior of Liquid Crystals in Confinement

Phasenverhalten von eingeschlossenen Fluessigkristallen

by Jonathan Fish
Doctoral thesis
Date of Examination:2011-10-10
Date of issue:2012-01-12
Advisor:Dr. Richard L. C. Vink
Referee:Prof. Dr. Marcus Mueller
Referee:Prof. Dr. Reiner Kree
crossref-logoPersistent Address: http://dx.doi.org/10.53846/goediss-2811

 

 

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Abstract

English

We use computer simulations to investigate the isotropic-to-nematic phase transition of liquid crystals. Using the Lebwohl-Lasher model with sophisticated algorithms, the phase transition is found to match experimental results and is weakly first-order in bulk. By changing the strength of a microscopic detail we show the macroscopic phase transition can be made more strongly first-order. Our simulations are made more complicated by adding planar confinement and quenched disorder. In both cases, depending on the microscopic detail, the possible phase behaviors are a first-order phase transition, a continuous phase transition, or no phase transition at all.
Keywords: liquid crystals; quenched disorder; Lebwohl-Lasher model

Other Languages

Wir benutzen Simulationen um den isotropisch-nematisch Phasenuebergang von Fluessigkristallen zu untersuchen. Mit modernen Algorithmen zeigen wir, dass das Lebwohl-Lasher Modell einen schwachen erste-Ordnung Phasenuebergang zeigt, wie auch in Experimenten gefunden. Durch Aenderung eines mikroskopischen Details zeigen wir, dass der makroskopische Phasenuebergang verstaerkt sein kann. Unsere Simulationen werden durch ebene Einschraekungen und Stoerstellen verkompliziert. In beiden Faellen sind die moeglichen Phaseuebergaenge erster Ordnung, kontinuerlich, oder zerstoert, abhaengig von den mikroskopischen Details.
Schlagwörter: Fluessigkristallen; Störstellen; Lebwohl-Lasher Modell
 

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