Nonlinear optical studies of surface structures of rubbed polyimides and adsorbed liquid crystal monolayers

Authors
Oh-E, M Lvovsky, AI Wei, X Kim, DS Shen, YR
Citation
M. Oh-e et al., Nonlinear optical studies of surface structures of rubbed polyimides and adsorbed liquid crystal monolayers, MOLEC CRYST, 364, 2001, pp. 427-434
Citations number
9
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
MOLECULAR CRYSTALS AND LIQUID CRYSTALS → ACNP
Volume
364
Year of publication
2001
Pages
427 - 434
Database
ISI
SICI code
Abstract
Sum-frequency generation (SFG) vibrational spectroscopy and second-harmonic generation (SHG) were used to probe rubbed polyimide (PI) surfaces and liq uid crystal (LC) monolayers adsorbed on them. The results show that rubbing preferentially aligns PI backbones along the rubbing direction, but has li ttle effect on the side chain orientation at the surface. However, adsorpti on of an LC monolayer well aligned by the rubbed PI surface can cause the s ide chains to tilt towards the rubbing direction.