摘要:

The stationary deformations of nematic layers with a twisted structure are analysed by means of the Taylor expansion method based on catastrophe theory. The role of weak anchoring is investigated. Variations of the polar and azimuthal angles describing the surface director orientation are allowed. The stability of two equilibrium states, the twisted and the homeotropic, is studied. Several types of continuous and discontinuous transitions between them are revealed. The threshold voltages are calculated.

ISSN:0267-8292    

DOI:10.1080/02678299408036581

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

In polymer aligned liquid crystal cells, a surface layer exists. In this surface layer the in-plane distribution of the mesogens, the shape of the mesogens, and their average angle with the surface determine the pretilt angle in the bulk of the sample. A model to incorporate those effects has been proposed. This model gives quantitative agreement with a number of experiments for thick cells, where the optical effects of the surface layer can be neglected. By introducing a linear variation of the optical axis through the surface layer we get qualitative agreement between the model and the pretilt found in thin cells. The thickness of the surface layer is of the order 0·1–1·0 μm.

ISSN:0267-8292    

DOI:10.1080/02678299408036582

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0267-8292    

DOI:10.1080/02678299408036570

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor