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• W2526054514 abstract "We study the effect of an isotropic-nematic (I-N) phase transition on the liquid crystal alignment at untreated polymer surfaces. We demonstrate that the pattern at the untreated substrate in the planar cell where the other substrate is uniformly rubbed strongly depends on the temperature gradient across the cell during the I-N phase transition, being macroscopically isotropic if the untreated substrate is cooled faster, but becoming almost homogeneous along the rubbing direction in the opposite temperature gradient. We interpret the observed effect using complementary models of heat transfer and nematic elasticity. Based on the heat transfer model we show that the asymmetric temperature conditions in our experiments provide unidirectional propagation of the I-N interface during the phase transition and determine the initial director orientation pattern at the test's untreated surface. Using the Frank-Oseen model of nematic elasticity, we represent the three-dimensional director field in the nematic cell as a two-dimensional (2D) pattern at the untreated surface and perform 2D numeric simulations. The simulations explain the experimental results: Different initial director orientations at the untreated surface evolve into different stationary patterns." @default.
• W2526054514 created "2016-10-07" @default.
• W2526054514 creator A5006094958 @default.
• W2526054514 creator A5061177440 @default.
• W2526054514 date "2016-09-30" @default.
• W2526054514 modified "2023-09-26" @default.
• W2526054514 title "Liquid crystal alignment at macroscopically isotropic polymer surfaces: Effect of an isotropic-nematic phase transition" @default.
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• W2526054514 doi "https://doi.org/10.1103/physreve.94.032702" @default.
• W2526054514 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27739728" @default.
• W2526054514 hasPublicationYear "2016" @default.
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