THE RELATIONSHIPS BETWEEN THE BULK PROPERTIES OF NEMATIC LIQUID-CRYSTALS AND THEIR PRETILT ANGLES

Authors
MYRVOLD BO KONDO K OHHARA S
Citation
Bo. Myrvold et al., THE RELATIONSHIPS BETWEEN THE BULK PROPERTIES OF NEMATIC LIQUID-CRYSTALS AND THEIR PRETILT ANGLES, Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 239, 1994, pp. 211-228
Citations number
25
Categorie Soggetti
Crystallography
Journal title
Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals → ACNP
ISSN journal
1058725X
Volume
239
Year of publication
1994
Pages
211 - 228
Database
ISI
SICI code
1058-725X(1994)239:<211:TRBTBP>2.0.ZU;2-L
Abstract
Liquid crystal cells with five different polyimide alignment layers ha ve been made for the study of liquid crystals alignment mechanisms. Tw o of the alignment layers are crystalline and three are amorphous. The se cells have been filled with twenty different nematic liquid crystal line materials, and the relationship between the bulk properties and t he pretilt angles has been studied. We find that the polarity of the l iquid crystal is the best predictor for the pretilt angle. This effect can be explained by assuming that dimeric pairs of liquid crystal mol ecules are formed in the bulk, but that they are broken up on the crys talline surfaces.