Effects of Ni particles with different morphologies on electro-optical properties of nematic liquid crystal
-
摘要: 将不同形貌的Ni颗粒(类碗状Ni颗粒、Ni花颗粒和Ni球颗粒)掺杂在液晶中制备了扭曲向列相(TN)液晶显示模式液晶盒,采用液晶综合参数测试仪对掺杂不同形貌Ni颗粒的向列相液晶(NLC)显示模式液晶盒的阈值电压、饱和电压、对比度及响应时间进行了研究。结果表明,掺杂Ni颗粒后,液晶的电光性能得到明显改善,阈值电压、饱和电压均有所降低,对比度明显增大,响应时间下降。其中类碗状Ni颗粒改善效果最为明显,驱动电压降幅达到13.77%,对比度增大35.55%,响应时间降低至9.390 ms。Ni颗粒的形貌及比表面积对液晶的电光性能有很大影响。比表面积及曲率大的Ni颗粒对液晶电光性能的改善效果好。
-
关键词:
- Ni颗粒 /
- 向列相液晶(NLC) /
- 电光性能 /
- TN显示模式 /
- 液晶显示
Abstract: Twisted nematic (TN) liquid crystal display mode cells doped with different Ni particles were prepared, such as Ni bowls-like particles, Ni flowers particles and Ni spheres particles. The effects of different Ni particles on the threshold voltage, saturation voltage, contrast ratio and response time of nematic liquid crystal (NLC) display mode cells were investigated with a liquid crystal display parameters tester. It is found that the addition of Ni particles with different morphologies decrease the threshold voltage and the saturation voltage, increase the cantrast ratio and reduce the response times significantly. Especially, the TN cells doped with the Ni bowls-like particles have the best properties, the driving voltage could be reduced by 13.77%, the contrast ratio increases by 35.55% and response times decreases to 9.390 ms. The experiments indicate that the different shapes, structures and surface area of Ni particles have obvious effects on the electro-optical properties of liquid crystals. The larger the surface areas and the curvature of the bowls-like shape are, the better the electro-optical properties are. -
[1] 曹晖,马征,李克轩,等.碳纳米管对扭曲向列相液晶显示模式电-光性能的影响[J].北京科技大学学报,2009,31(11):1442-1446. CAO H,MA Z,LI K X,et al.Effects of carbon nanotubes on the electro-optical properties of the twisted nematic liquid crystal display mode[J].Journal of University of Science and Technology Beijing,2009,31(11):1442-1446(in Chinese). [2] SHIVAKUMAR U,MIRZAEI J,HEGMANN T.Nanoparticles:Complex and multifaceted additives for liquid crystals[J].Liquid Crystals,2011,38(11-12):1495-1514. [3] WANG Q K,WU X H,WANG D Y,et al.Electro-optic effect of twisted nematic liquid crystal[J].Physics Experimentation,2007,27(12):37-39. [4] 于天池,高伟光,邹滨雁.液晶电光效应的应用研究[J].大连交通大学学报,2007,28(1):8-10. YU T C,GAO W G,ZOU B Y.Application study of electro-optic effect of liquid crystal[J].Journal of Dalian Jiaotong University,2007,28(1):8-10(in Chinese). [5] HA Y S,KIM H J,PARK H G,et al.Enhancement of electro-optic properties in liquid crystal devices via titanium nanoparticle doping[J].Optics Express,2012,20(6):6448-6455. [6] CHOA M J,PARK H G,JEONG H C,et al.Superior fast switching of liquid crystal devices using graphene quantum dots[J].Liquid Crystals,2014,41(6):761-767. [7] LEE W,WANG C Y,SHIH Y C.Effects of carbon nanosolids on the electro-optical properties of a twisted nematic liquid-crystal host[J].Applied Physics Letters,2004,85(4):512-515. [8] REZNIKOV Y,BUCHNEV O,TERESHCHENKO O,et al.Ferroelectric nematic suspension[J].Applied Physics Letters,2003,82(12):1917-1919. [9] NISHIDA N,SHIRAISHI Y,KOBAYASHI S,et al.Fabrication of liquid crystal sol containing capped Ag-Pd bimetallic nanoparticles and their electro-optic properties[J].Journal of Physical Chemistry C,2008,112(51):20284-20290. [10] SAKAI Y,NISHIDA N,KOBAYASHI S,et al.Dielectric properties of twisted nematic liquid crystal displays fabricated by doping Ag-Pd metal nanoparticles having a long term stability[J].Molecular Crystals and Liquid Crystals,2005,441(1):143-152. [11] SHIRAISHI Y,TOSHIMA N.Frequency modulation response of a liquid-crystal electro-optic devicedoped with nanoparticles[J].Applied Physics Letters,2002,81(15):2845-2847. [12] SANO S,MIYAMA T,KOBAYASHI S.Enhancement of the characteristics of LCDs by doping nanoparticles:Reduction of the operating voltage,viscosity and response times[C]//Proceedings of SPIE.San Diego,CA:SPIE Press,2006,6135:613501. [13] QI H,KINKEAD B,HEGMANN T.Unprecedented dual alignment mode and Freedericksz transition in planar nematic liquid crystal cells doped with gold nanoclusters[J].Advanced Function Materials,2008,18(2):212-221. [14] QI H,HEGMANN T.Impact of nanoscale particles and carbon nanotubes on current and future generations of liquid crystal display[J].Journal of Materials Chemistry,2008,18:3288-3294. [15] URBANSKI M,KINKEAD B,QI H,et al.Electro-convection in nematic liquid crystals via nanoparticle doping[J].Nanoscale,2010,2(7):1118-1121. [16] RHEEM Y,YOO B Y,BEYERMANN W P,et al.Magnetotransport studies of a single nickel nanowire[J].Nanotechnology,2007,18:015202. [17] ZHOU W,ZHENG J L,YUE Y H,et al.Highly stable rGO-wrapped Ni3S2 nanobowls:Structure fabrication and superior long-life electrochemical performance in LIBs[J].Nano Energy,2015,11:428-435. [18] HUANG S X,FISCHER D A,GLAND J L.Aniline adsorption,hydrogenation and hydrogenolysis on the Ni(100) surface[J].Journal of Physical Chemistry,1996,100(24):10223-10234. [19] ZHOU W,LIN L J,ZHAO D Y,et al.Synthesis of nickel bowl-like nanoparticles and their doping for inducing planar alignment of a nematic liquid crystal[J].Journal of the American Chemistry Society,2011,133(22):8389-8391. [20] GOEL P,BIRADAR A M.Induced dielectric relaxation and enhanced electro-optic parameters in Ni nanoparticles-ferroelectric liquid crystal dispersions[J].Liquid Crystals,2013,40(1):45-51. [21] LEE H M,CHUNG H K,PARK H G,et al.Residual DC voltage-free behaviour of liquid crystal system with nickel nanoparticle dispersion[J].Liquid Crystals,2014,41(2):247-251. [22] ZHOU W,GUO L,HE L,et al.Synthesis,characterization,and magnetic properties of flower-like nickel materials[J].Physica Status Solidi(a),2008,205(5):1109-1112. [23] ZHAO D Y,ZHOU W,GUO L,et al.Alignment of liquid crystals doped with nickel nanoparticles containing different morphologies[J].Advanced Materials,2011,23:5779-5784. [24] CHANDRAN A,PRAKASH J,BIRADAR A M,et al.Preparation and characterization of MgO nanoparticles/ferroelectric liquid crystal comp-osites for faster display devices with improved contrast[J].Journal of Materials Chemistry C,2014,2(10):1844-1853. [25] CHUNGA H K,PARK H G,SEO D S,et al.Superior electro-optic properties of liquid crystal system using cobalt oxide nanoparticle dispersion[J].Liquid Crystals,2013,40(5):632-638.
点击查看大图
计量
- 文章访问数: 833
- HTML全文浏览量: 178
- PDF下载量: 496
- 被引次数: 0