Busca avançada
Ano de início
Entree
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Spontaneous striped pattern formation in thin chiral nematic liquid crystal layers

Texto completo
Autor(es):
Biagio, R. L. [1] ; De Souza, R. T. [2] ; Evangelista, L. R. [1] ; Ribeiro de Almeida, R. R. [2] ; Zola, R. S. [1, 2]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Estadual Maringa, Dept Fis, Ave Colombo 5790, BR-87020900 Maringa, Parana - Brazil
[2] Univ Tecnol Fed Parana, Dept Fis, Rua Marcilio Dias 635, BR-86812460 Apucarana, PR - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF MOLECULAR LIQUIDS; v. 269, p. 703-711, NOV 1 2018.
Citações Web of Science: 3
Resumo

Periodic modulations in chiral nematic liquid crystals (CLCs) are used in several optical and photonic devices. A remarkable way of fabricating and controlling such patterns is in a thin wetting layer that grows as temperature is decreased. Here, we study this stripe formation process experimentally and by means of Monte Carlo simulations. We report on samples of CLCs that present, after the wetting transition, a stripe/fringe formation occurring either through a nucleation process or homogeneously across the cell. These patterns depend on the ratio of the pitch to thickness of the layer, elastic anisotropy, and anchoring strength. Although such process is well documented for CLCs under applied field, we show here that similar textural transitions occur in thin layers mediated by the weak anchoring at the CLC-isotropic interface; it happens for values of pitch to thickness ratio much smaller than the ones reported in field driven situation. The Monte Carlo method takes action in simulating the experimentally observed textures by using a pairwise additive potential model for CLCs. A qualitative comparison with the experimental phenomena is possible to be made in which both the stripes formation and their behavior agree with the experiments. (C) 2018 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 14/50983-3 - INCT 2014: fluidos complexos
Beneficiário:Antonio Martins Figueiredo Neto
Linha de fomento: Auxílio à Pesquisa - Temático