Author:
Lee Hak Moo,Chung Hyung-Koo,Park Hong-Gyu,Jeong Hae-Chang,Kim Jeong-Hwan,Park Tae-Kyu,Seo Dae-Shik
Abstract
We examined the properties of nematic liquid crystal (N-LC) systems with dispersed nickel oxide nanoparticles (NPs). Uniform LC alignments with regular pretilt angles were achieved on rubbed polymer surface regardless of NiO nanoparticles concentration. We confirmed the electro-optical
characteristics of twisted nematic (TN) cells containing NiO nanoparticles on rubbed polymer surface, which exhibited lower threshold voltages and faster response times with less capacitance hysteresis than pure LC cells. It is clear that the response time of TN cells on rubbed polymer surfaces
decreases with increasing the NiO nanoparticles concentration. These results demonstrate the relationship between NP doping concentration and trapping of impurity ions, and were confirmed by a software simulation of electric flux and field density. NiO nanoparticles in the LC cells focused
the electric field flux and strengthened the electric field. Further, NiO nanoparticles in LC medium trapped charged ionic impurities and suppressed the screen effect, leading to a stronger electric field and the van der Waals interactions between LC molecules and the alignment layers.
Publisher
American Scientific Publishers
Subject
Condensed Matter Physics,General Materials Science,Biomedical Engineering,General Chemistry,Bioengineering
Cited by
15 articles.
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