Dielectric relaxation dynamics in liquid crystal – dye composites

Rahman, Muklesur; Hsieh, Chien Wen; Wang, Chun Tsai; Jian, Bo Ru; Lee, Wei

doi:10.1016/j.dyepig.2009.07.005

Cited by 33 publications

(18 citation statements)

References 31 publications

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“…Relaxation frequencies of such empty cells that are normally observed in the higher frequency range are not influenced by the temperature. Similar observations were made by Cava et al [23] and Rahman et al [24]. The empty cell used in our experiment also showed relaxation frequency near 1.07 MHz.…”

Section: Dielectric Responsesupporting

confidence: 88%

Investigation of liquid crystal dispersion and dielectric relaxation behavior in polymer dispersed liquid crystal composite films

Parab¹,

Malik²,

Bhatia³

et al. 2014

Journal of Molecular Liquids

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Section: Dielectric Responsesupporting

confidence: 88%

Investigation of liquid crystal dispersion and dielectric relaxation behavior in polymer dispersed liquid crystal composite films

Parab¹,

Malik²,

Bhatia³

et al. 2014

Journal of Molecular Liquids

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“…To confirm the relaxation mode, the dielectric spectra of the empty cell were measured, indicating that the relaxation frequency of the empty cell appeared at~10 7 Hz, which was the cell relaxation originating from the finite resistance of the ITO electrode and the inductance of connecting wires used in the cell [28,29]. Furthermore, as demonstrated in the literature [30,31], in a homogeneously aligned cell filled with pristine E7, the relaxation frequencies of the cell without and with voltage (40 V) supplied were observed at 1 MHz and~10 5 Hz, respectively. The relaxation frequency at 1 MHz was attributed to the LC reorientation along the long axis, and that at 10 5 Hz was mainly attributed to the LC reorientation along the short axis.…”

Section: Introductionmentioning

confidence: 99%

Electro-optical Effect of Gold Nanoparticle Dispersed in Nematic Liquid Crystals

et al. 2017

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Abstract:The electro-optical performance of nematic liquid crystals (NLCs) dispersed with gold nanoparticles (GNPs) was investigated in this study. The addition of a small amount of GNP dopant decreased the threshold voltage for LC reorientation due to the decreased elastic constant and increased dielectric anisotropy of the LC mixture. The response time of the LC cell was decreased with the addition of tiny amounts of GNPs because of decrease in rotational viscosity of LCs. The doped GNPs also shorten LC reorientation angle during voltage switching, further decreasing the response time of the LC cell. The addition of high amounts of GNPs slowed down the response time of the LC cell, because excess GNPs aggregated and formed networks in the cell, thus disturbing LC alignment and hindering LC reorientation. The measured dielectric spectra of the GNP-LC mixture revealed that the addition of GNPs decreased the relaxation time constant of the LCs. This result confirmed that the GNP dopant decreased the rotational viscosity and elastic constant of the LCs.

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“…As shown in Fig. 4, for all the samples, both ε' and ε" decrease with increasing frequency, which is typical dielectric relaxation and can be attributed to the reorientation of the permanent molecular dipoles [22]. Fig.…”

Section: Electrical Propertiesmentioning

confidence: 91%

Enhancement of Electrical and Mechanical Properties of SU-8 Photocrosslinked Coatings Containing Polypyrrole-graphene Oxide Nanoparticles

Sharif

Pourabas

2016

J. Photopol. Sci. Technol.

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In the present study, photo-curing of polypyrrole decorated graphene oxide nanoparticle (PPy-GO) filled SU-8 photoresist and its effect on the electrical and mechanical properties of nanocomposite were investigated at different loading level of PPy-GO. Chemical structure of SU-8 and its nanocomposites before and after UV irradiation have been characterized using infrared spectroscopy. A significant increase of electrical conductivity was observed as a function of filler content in the nanocomposites confirming the conducting nature of the polymeric coating with incorporation of PPy-GOs. The real permittivity was observed to increase with increasing the PPy-GOs nanofiller loading, and the enhanced permittivity was interpreted by the interfacial polarization. The mechanical properties analysis demonstrated that the hardness has increased 2 time and SEM observations indicated well dispersion of PPy-GO nanoparticles within the cured SU-8 resin matrix.

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Dielectric relaxation dynamics in liquid crystal – dye composites

Cited by 33 publications

References 31 publications

Investigation of liquid crystal dispersion and dielectric relaxation behavior in polymer dispersed liquid crystal composite films

Investigation of liquid crystal dispersion and dielectric relaxation behavior in polymer dispersed liquid crystal composite films

Electro-optical Effect of Gold Nanoparticle Dispersed in Nematic Liquid Crystals

Enhancement of Electrical and Mechanical Properties of SU-8 Photocrosslinked Coatings Containing Polypyrrole-graphene Oxide Nanoparticles

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