TY - JOUR
T1 - Anisotropic dispersion force effects for alignment of liquid crystals on rubbed polystyrene surfaces
AU - Seo, Dae Shik
AU - Yoshida, Norihiro
AU - Kobayashi, Shunsuke
AU - Nishikawa, Michinori
AU - Yabe, Yoshikazu
PY - 1995/9
Y1 - 1995/9
N2 - We have studied the anisotropic dispersion force effects for alignment of liquid crystals (LCs) on rubbed polystyrene (PS) surfaces. We previously demonstrated that the nematic (N) LCs are shown to align in the direction perpendicular to the rubbing and polar anchoring strength is very weak compared to rubbed polyimide (Pi) surfaces [D.-S. Seo et al.: Jpn. J. Appl. Phys. 31 (1992) 2165]. In microphotographs of the textures, we obtained the NLCs are shown to align in both direction parallel and perpendicular to the rubbing for region up to medium rubbing, however to align in the direction perpendicular to the rubbing for strong rubbing region. We suggest that the anisotropic dispersion force is very important rather than macro-surface groove effect to uniform alignment of LCs. We also observed the surface ordering of the NLCs on rubbed PS surfaces for strong rubbing is disordered. We suggest that the low polarization of the orientation surfaces is attributed to weak anchoring strength.
AB - We have studied the anisotropic dispersion force effects for alignment of liquid crystals (LCs) on rubbed polystyrene (PS) surfaces. We previously demonstrated that the nematic (N) LCs are shown to align in the direction perpendicular to the rubbing and polar anchoring strength is very weak compared to rubbed polyimide (Pi) surfaces [D.-S. Seo et al.: Jpn. J. Appl. Phys. 31 (1992) 2165]. In microphotographs of the textures, we obtained the NLCs are shown to align in both direction parallel and perpendicular to the rubbing for region up to medium rubbing, however to align in the direction perpendicular to the rubbing for strong rubbing region. We suggest that the anisotropic dispersion force is very important rather than macro-surface groove effect to uniform alignment of LCs. We also observed the surface ordering of the NLCs on rubbed PS surfaces for strong rubbing is disordered. We suggest that the low polarization of the orientation surfaces is attributed to weak anchoring strength.
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U2 - 10.1143/JJAP.34.4876
DO - 10.1143/JJAP.34.4876
M3 - Article
AN - SCOPUS:0029369624
SN - 0021-4922
VL - 34
SP - 4876
EP - 4879
JO - Japanese journal of applied physics
JF - Japanese journal of applied physics
IS - 9R
ER -