title: Enhancement of electro-optic properties in liquid crystal devices via titanium nanoparticle doping.
abstract: We investigated the properties of nematic liquid crystal device (NLC) doped with titanium (Ti) nanoparticle (~100nm). The electro-optic (EO) properties of LCs changed according to Ti nanoparticle doping concentration. Ti nanoparticles in the NLC cells focused the electric field flux and strengthened the electric field. Further, Ti nanoparticles in NLC molecules may trap charged ionic impurities and suppress the screen effect, leading to a stronger electric field and the van der Waals dispersion interactions between NLC molecules and the alignment layers. We also simulated the boundary conditions of the Ti nanoparticles in the electric field using Ansoft Maxwell software. Our experimental results agreed with the phenomenon predicted by software simulation based on general physical theory. Synthetically, at a 1.0 wt. % Ti nanoparticle doping concentration, the NLC cells showed the best EO properties, such as a low threshold voltage (1.25V), fast response time (13.2ms), and low pretilt angle (3.90°).
authors.affiliation: Information Display Device Laboratory, department of Electrical and Electronic Engineering, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749, South Korea.
authors.forename: Yong-Seok
authors.initials: YS
authors.lastname: Ha
authors.forename: Hyung-Jun
authors.initials: HJ
authors.lastname: Kim
authors.forename: Hong-Gyu
authors.initials: HG
authors.lastname: Park
authors.forename: Dae-Shik
authors.initials: DS
authors.lastname: Seo
mesh_terms: D000042:Absorption; D017076:Computer-Aided Design; D004574:Electromagnetic Fields; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D050866:Liquid Crystals / Q000737:chemistry* / Q000528:radiation effects; D008422:Materials Testing; D053758:Nanoparticles / Q000737:chemistry*; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D014025:Titanium