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Electro-Optical and Electrochemical Properties of Poly(2-ethynyl-N-glycidylpyridinium bromide)
Gui, Tai-Long,Wang, Yue,Wang, Jian-Min,Jin, Sung-Ho,Shim, Sang-Yeon,Park, Jong-Wook,Lim, Kwon Taek,Gal, Yeong-Soon TaylorFrancis 2009 Molecular Crystals and Liquid Crystals Vol.513 No.1
<P> An ionic polyacetylene with the pendent N-glycidylpyridinium bromide, poly(2-ethynyl-N-glycidylpyridinium bromide), was synthesized in 91% yield by the activated polymerization of 2-ethynylpyridine with epibromohydrin without any additional catalyst or catalyst. This polymer exhibited characteristic UV-visible absorption band at 515 nm and yellow PL spectrum at 598 nm corresponding to the photon energy of 2.07 eV. The cyclovoltamograms of polymer exhibited the electrochemically stable window in the region of -1.4 ∼ 1.8 V and the redox current value gradually increased as the scan rate increased. The kinetics of the redox process of polymer was found to be well-controlled by the reactant diffusion process from the experiment of the oxidation current density of PEGPB versus the scan rate.</P>
Electro-Optical and Electrochemical Properties of Poly(phenylacetylene)
Gal, Yeong-Soon,Lee, Won-Chul,Jin, Sung-Ho,Park, Young-Il,Park, Jong-Wook,Lim, Kwon Taek,Kim, Sang Youl TaylorFrancis 2009 Molecular Crystals and Liquid Crystals Vol.513 No.1
<P> Poly(phenylacetylene)[Poly(PA)] was prepared by the polymerization of phenylacetylene with the catalyst of (NBD)PdCl2. The instrumental analysis data on the polymer structure revealed that the poly(PA) have the conjugated polyene backbone structure with phenyl substituents. The band gap energy of poly(PA) was estimated to be 2.51 eV and the photoluminescence spectra of poly(PA) showed that the photoluminescence peak is located at 439 nm, corresponding to a photon energy of 2.82 eV. The cyclovoltamograms of poly(PA) exhibited that the irreversible oxidation and reduction were occurred at 0.38 V and -0.93 V, respectively (vs Ag/AgNO3). The redox current value gradually increased as the scan rate increased.</P>
Preparation, Structural and Spectral Properties of Poly(2-ethynylbenzyl alcohol)
Lee, Won-Chul,Jin, Sung-Ho,Lyoo, Won Seok,Park, Jong-Wook,Lim, Kwon Taek,Kim, Sang Youl,Gal, Yeong-Soon TaylorFrancis 2009 Molecular Crystals and Liquid Crystals Vol.513 No.1
<P> A hydroxy group-containing polyacetylene, poly(2-ethynylbenzyl alcohol)[poly(EBA)] was prepared by the polymerization of 2-ethynylbenzyl alcohol by using various transition metal catalysts. This polymerization proceeded in somewhat mild manner to give in moderate yield. The instrumental analysis data on the chemical structure of poly(EBA) indicated that the present polymer have a conjugated polymer backbone system with the designed substituents. The photoluminescence peak of polymer was observed at 525 nm, which is corresponded to the photon energy of 2.36 eV and the band gap of poly(EBA) was 2.38 eV. The cyclovoltamograms of the polymer exhibited the irreversible electrochemical behaviors. It was found that the kinetics of the redox process of this conjugated polymer might be mainly controlled by the diffusion process from the experiment of the oxidation current density of polymer versus the scan rate.</P>
Preparation of Composite Adhesive Spacer Particles for Flexible LCD Application
Kim, Eun Hye,Kim, Soo Yeon,Kim, Sung Soo TaylorFrancis 2007 MOLECULAR CRYSTALS AND LIQUID CRYSTALS - Vol.464 No.1
<P> Adhesive spacer particles were fabricated to ensure the uniform cell gap between the plastic substrates for application in flexible liquid crystal display (LCD). Surface modification of rigid silica particles was performed to render adhesive polymer layer on the surface of the silica particles while maintaining the rigid properties. Methyl methacrylate (MMA) and styrene were graft-polymerized onto silica surface by UV irradiation and characterization experiments confirmed the formation of covalent bond between polymer and silica particle. FE-SEM image analysis indicated substantial increase in mean diameter of the particles after UV-induced grafting of the monomers. T-peel test value of 2.7 N/cm for PMMA film/Polyimide-PES substrate system also confirmed the applicability of these composites in flexible LCD.</P>
New Multi-Phenylated Carbazole Derivatives for OLED through Diels-Alder Reaction
Park, Young-Il,Lee, Seung-Eun,Park, Jong-Wook,Oh, Se-Young TaylorFrancis 2007 Molecular Crystals and Liquid Crystals Vol.470 No.1
<P> We synthesized multi-phenylated carbazole derivatives such as 3,6-Bis[(2,3,4,5-tetraphenyl)phenyl]-9-ethylcarbazole(BTPEC) and 3,6-Bis(7,10-diphenyl-fluoranthene)-9-ethlycarbazole(BDPEC), through Diels-Alder reaction. These products were identified by NMR, Fab-Mass analysis. Electro-optical properties of these materials were characterized by cyclic voltammetry (CV) and, UV-visible and photoluminescence (PL) spectra. The maximum absorbance of BTPEC appeared at 307 nm and BDPEC showed maximum absorbance of 307 nm and 388 nm. And two compounds also exhibited PL peaks at 389 nm and 483 nm. When we used these two materials as hole injection layer(HIL) and hole transport layer(HTL) in OLED device, the devices showed about 3 cd/A and 2 cd/A, respectively.</P>
Wang, Li Li,Lee, Kyung-Tae,Jung, Kwang-Woo,Lee, Dong-Gi,Bahn, Yong-Sun TaylorFrancis 2018 Virulence Vol.9 No.1
<P><B>ABSTRACT</B></P><P>Microtubules are involved in mechanical support, cytoplasmic organization, and several cellular processes by interacting with diverse microtubule-associated proteins such as plus-end tracking proteins, motor proteins, and tubulin-folding cofactors. A number of the cytoskeleton-associated proteins (CAPs) contain the CAP-glycine-rich (CAP-Gly) domain, which is evolutionarily conserved and generally considered to bind to α-tubulin to regulate the function of microtubules. However, there has been a dearth of research on CAP-Gly proteins in fungal pathogens, including <I>Cryptococcus neoformans</I>, which is a global cause of fatal meningoencephalitis in immunocompromised patients. In this study, we identified five CAP-Gly protein-encoding genes in <I>C. neoformans</I>. Among these, Cgp1 encoded by CNAG_06352 has a unique domain structure containing CAP-Gly, SPEC, and Spc7 domains that is not orthologous to CAPs in other eukaryotes. Supporting the role of Cgp1 in microtubule-related function, we demonstrate that deletion or overexpression of <I>CGP1</I> alters cellular susceptibility to thiabendazole, a microtubule destabilizer and that Cgp1 is co-localized with cytoplasmic microtubules. Related to the cellular function of microtubules, Cgp1 governs the maintenance of membrane stability and genotoxic stress responses. Deletion of <I>CGP1</I> also reduces production of melanin pigment and attenuates the virulence of <I>C. neoformans</I>. Furthermore, we demonstrate that Cgp1 uniquely regulates the sexual differentiation of <I>C. neoformans</I> with distinct roles in the early and late stage of mating. Domain analysis revealed that the CAP-Gly domain plays a major role in all Cgp1 functions examined. In conclusion, this novel CAP-Gly protein, Cgp1, has pleotropic roles in regulating growth, stress responses, differentiation, and virulence in <I>C. neoformans</I>.</P>
Effects of the Plasma Treatment on the Electrical Properties of Indium Tin Oxide Thin Films
Lee, S. G.,Park, J. Y.,Lee, S. M.,Sohn, S. H. TaylorFrancis 2009 Molecular Crystals and Liquid Crystals Vol.513 No.1
<P> The sheet resistance of the ITO films after oxygen and nitrogen plasma treatments was investigated, based on the change in the lattice characteristics such as the grain size and the lattice strain. The plasma treatment yields an increase in the grain size thence the electrical conductivity in addition to better surface morphology. The decrease in lattice strain is attributable to the increase in the grain size. The experimental results imply that the grain boundary scattering limited mobility plays an important role in the conductivity of ITO films.</P>
Simulation of the Optical Transmittance of IPS LC-Cell on Temperature Variation
Yeo, Jun-Ho,Ji, Seung-Hoon,Choi, Hyun Chul,Lee, Seung Hee,Lee, Gi-Dong TaylorFrancis 2009 Molecular Crystals and Liquid Crystals Vol.510 No.1
<P> In this paper we calculated optical transmittance of the In-Plane Switching (IPS) liquid crystal (LC) cell with respect to temperature. By considering temperature energy term in the Gibb's free energy, we could achieve the temperature parameters that need to calculate the temperature dependence on the electro-optic characteristics. The calculated temperature parameters permit us to calculate scalar order parameter S with respect to temperature, so that finally we could calculate the optical transmittance of the IPS LC cell as a function of temperature.</P>