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Morphology of the Conducting Poly-N-vinylcarbazole-coated Silica Gel Nanocomposites
바사바,Na Ri Kim,Eun Ae Jo,Revanasiddappa,Do Sung Huh 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.2
We report the effect of surface morphology on the conductivity of the poly-N-vinylcarbazole (PVK)/silica gel (SiO2) nanocomposites as a function of SiO2 weight percentage (%).The polymerization of PVK was initiated by a free-radical polymerization. The surface morphology of the prepared composite shows the incorporation of SiO2 in the prepared PVK-SiO2 (PS) nanocomposites. The conductivity increased from 9.2 × 10‒5 S cm-1 to 9.6 × 10‒4 S cm‒1 with the increase in the percentage of clay from 5 to 30%. The nanocomposites show a percolation behavior having a threshold value between 15 and 20%.
The Study of DC Conductivity for Polyaniline-polymannuronate Nano Composites
허도성,Y. Veeranagouda,이경,R. Pierson, M. Revanasiddappa,바사바 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.12
Conducting polyaniline-polymannuronate (PANI-PM) composites have been prepared by in situ deposition technique by placing different wt.% of fine grade powder of polymannuronate (5, 10, 15, and 25%) during polymerization of polyaniline. The oxidative polymerization of aniline was carried by using ammonium persulfate as oxidant. Further the temperature-dependent DC conductivity of PANI-PM composites was studied within the range of 300 ≤ T ≤ 500 K. The conductivity data shows an evidence for the transport properties of PANI-PM composites. This study in turn supports the strong interaction of PANI with PM in the composites. Based on the DC conducting properties the composites signify the future development of new materials for the creation of new bio-nanocomposites that has a multi-component and multifunctional material.
바사바,Young Min Choi,Hyun Tae Park,Do Sung Huh*,이재욱,M. Revanasiddappa,S. C. Raghavendra,S. Khasim,T. K. Vishnuvardhan 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.7
Conducting Polypyrrole-lead titanate (PPy/?PbTiO3) composites have been prepared by in situ deposition technique by placing different wt.% of fine grade powder of PbTiO3 (10, 20, 30, 40, and 50%) during polymerization of pyrrole. The composites formed were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA), and these data indicate that PbTiO3 particles are dominating with an increase in crystallinity as well as thermal stability of the composites. The results on the low frequency dielectric studies which are obtained in the form of pressed pellet state are interpreted in terms of Maxwell Wagner polarization, which are responsible for the dielectric relaxation mechanism and frequency dependence of conductivity.
Morphology of the Conducting Poly-N-vinylcarbazole-coated Silica Gel Nanocomposites
Basavaraja, C.,Kim, Na-Ri,Jo, Eun-Ae,Revanasiddappa, M.,Huh, Do-Sung Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.2
We report the effect of surface morphology on the conductivity of the poly-N-vinylcarbazole (PVK)/silica gel ($SiO_2$) nanocomposites as a function of $SiO_2$ weight percentage (%).The polymerization of PVK was initiated by a free-radical polymerization. The surface morphology of the prepared composite shows the incorporation of $SiO_2$ in the prepared PVK-$SiO_2$ (PS) nanocomposites. The conductivity increased from $9.2{\times}10^{-5}S\;cm^{-1}$ to $9.6{\times}10^{-4}S\;cm^{-1}$ with the increase in the percentage of silica gel from 5 to 30%. The nanocomposites show a percolation behavior having a threshold value between 15 and 20%.
Basavaraja, C.,Choi, Young-Min,Park, Hyun-Tae,Huh, Do-Sung,Lee, Jae-Wook,Revanasiddappa, M.,Raghavendra, S.C.,Khasim, S.,Vishnuvardhan, T.K. Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.7
Conducting Polypyrrole-lead titanate (PPy/PbTiO3) composites have been prepared by in situ deposition technique by placing different wt.% of fine grade powder of PbTiO3 (10, 20, 30, 40, and 50%) during polymerization of pyrrole. The composites formed were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA), and these data indicate that PbTiO3 particles are dominating with an increase in crystallinity as well as thermal stability of the composites. The results on the low frequency dielectric studies which are obtained in the form of pressed pellet state are interpreted in terms of Maxwell Wagner polarization, which are responsible for the dielectric relaxation mechanism and frequency dependence of conductivity.