《Peculiar orientation of nematic liquid crystals on rubbed polyvinylimidazole》 was written by Frunza, S.; Beica, T.; Moldovan, R.; Zgura, J.; Frunza, L.. Recommanded Product: 74305-48-9 And the article was included in Journal of Optoelectronics and Advanced Materials on August 31 ,2005. The article conveys some information:
Alignment properties of rubbed films of polyvinylimidazole were studied by observing with the polarizing microscope the features of the nematic liquid crystal (LC) droplets onto these layers. The observing of the droplets can reveal the direction of easy axis on the alignment substrate not only in the case of LC having the director normal to the LC/air interface but also in the case of the director tangent to this interface, when no disclination line could be seen. Some of the LCs are oriented parallel to the rubbing direction, but the other LCs are perpendicularly oriented. This peculiar behavior is at variance to that found on rubbed layers of poly vinyl alc. The role of the end-groups in the structure of the LCs on the alignment properties is discussed. In addition to this study using 4-n-Pentylphenyl-4-pentylbenzoate, there are many other studies that have used 4-n-Pentylphenyl-4-pentylbenzoate(cas: 74305-48-9Recommanded Product: 74305-48-9) was used in this study.
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Referemce:
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