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Competition between local disordering and global ordering fields in nematic liquid crystals
We study the influence of external electric or magnetic field B on orientational ordering of nematic liquid crystals or of other rod-like objects (e.g. nanotubes immersed in a liquid) in the presence of random anisotropy field type of disorder. The Lebwohl–Lasher lattice type of semi-microscopic app...
Autores principales: | , , |
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Formato: | Texto |
Lenguaje: | English |
Publicado: |
Beilstein-Institut
2010
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2874415/ https://www.ncbi.nlm.nih.gov/pubmed/20502609 http://dx.doi.org/10.3762/bjoc.6.2 |
Sumario: | We study the influence of external electric or magnetic field B on orientational ordering of nematic liquid crystals or of other rod-like objects (e.g. nanotubes immersed in a liquid) in the presence of random anisotropy field type of disorder. The Lebwohl–Lasher lattice type of semi-microscopic approach is used at zero temperature. Therefore, results are valid well below the transition into the isotropic phase. We calculate the correlation function of systems as a function of B, concentration p of impurities imposing random anisotropy field disorder, the disorder strength W and system dimensionality (2D and 3D systems). In order to probe memory effects we calculate correlation length ξ for random and homogeneous initial configurations. We determine the crossover fields B(c)(p) separating roughly the ordered and disordered regime. Memory effects are apparent only in the latter case, i.e. for B < B(c). PACS numbers: 47.51.+a, 47.54.-r, 07.05.Tp, 61.30.-v |
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