Characterizing Two Methods for Achieving Intermediate Surface Pretilt

Autor:	C. J. Holmes, J. R. Sambles, T. S. Taphouse
Rok vydání:	2012
Předmět:	chemistry.chemical_classification Materials science business.industry Homeotropic alignment Doping General Chemistry Polymer Condensed Matter Physics Contact angle Optics Planar chemistry Liquid crystal Optoelectronics General Materials Science business Layer (electronics) Polyimide
Zdroj:	Molecular Crystals and Liquid Crystals. 553:81-89
ISSN:	1563-5287 1542-1406
Popis:	Two recipes for controlling the degree of surface pretilt exhibited by the director of the nematic liquid crystals 5CB and ZLI-2293 (Merck) are characterized. The first involves an “overbaked” and rubbed homeotropic aligning polyimide (Nissan SE-1211), and the second uses a rubbed layer of planar aligning polyimide (Nissan SE-130) on top of a homeotropic aligning polyimide (Nissan SE-4811). These allow the director pretilt to be controlled through a range of angles as measured here using the technique of an antiparallel aligned cell doped with a dichroic dye. Results for the “overbaked” Nissan SE-1211 suggest that the degree of pretilt obtained is strongly dependent on the surface upon which the aligning polymer is deposited. Measurements of surface energies using contact angles suggest they have little or no role in controlling the pretilt produced.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::68abcbbe44b17f03ea485c96ea43a150 https://doi.org/10.1080/15421406.2011.609407 Zobrazit plný text záznamu