• Proceedings of the Korean Fiber Society Conference
• /
• 1993.06b
• /
• pp.173-177
• /
• 1993

• Bulletin of the Korean Chemical Society
• /
• v.25 no.9
• /
• pp.1421-1422
• /
• 2004

• Bulletin of the Korean Chemical Society
• /
• v.33 no.2
• /
• pp.721-724
• /
• 2012

• Journal of the Korean Electrochemical Society
• /
• v.13 no.4
• /
• pp.240-245
• /
• 2010

This work explored the catalytic effect of Pt in multi-wall carbon nanotube and poly-pyrrole conductive polymer electrocatalysts (Pt/PPy/MWCNT). A home-made Pt/PPy/MWCNT catalyst was first evaluated by comparing its electrochemical active surface area (ESA) with E-Tek commercial catalysts by cyclic voltammetry in $H_2SO_4$ solution. Then, the methanol oxidation currents of Pt/PPy/MWCNT and the hydrogen peaks in $H_2SO_4$ solution were serially measured with microporous electrode. This provided the current density of methanol oxidation based on the ESA, allowing a quantitative comparison of catalytic activity. The current densities were also measured for Pt/C catalysts of E-Tek and Tanaka Precious Metal Co. The current densities for the different catalysts were similar, implying that catalytic activity depended directly on the ESA rather than charge transfer or electronic conductivity.

• Applied Chemistry for Engineering
• /
• v.7 no.2
• /
• pp.393-400
• /
• 1996

The conducting polymer composites were prepared by imbibing the porous particle with an $FeCl_3$ oxidant solution, drying the imbibed porous particle, and imbibing again with pyrrole solution for polymerization to take place in the pore. The conductivity of the porous composite particles, was higher than that of nonporous particles. Also, the conductivity of composite was increased with increasing specific surface area and pore specific volume of the host porous particles since the degree of formation of conducting polymer in the pore increased.

• Applied Chemistry for Engineering
• /
• v.8 no.5
• /
• pp.784-789
• /
• 1997

Aluminium solid electrolytic capacitor in which electroconducting polypyrrole(PPy) is used as an electrolyte is studied. Pyrrole(Py) is electrochemically synthesized using the etched and anodized aluminium foil electrode($Al_2O_3$) as an anode on which the thin layer of chemicalpolymerized PPy as a pre-coating layer is formed previously by chemical oxidative polymerization(CP). Investigating the effects of the polymerization conditions on the electrical characteristics of resulting capacitors, the capacitors which were obtained from the galvanostatic electrolysis of pyrrole containing sodium p-toluenesulfonate(TsONa) under the currents of $2.0{\sim}4.0mA/unit(6.5{\times}10mm)$, showed the most superior properties.

• Biomedical Science Letters
• /
• v.1 no.1
• /
• pp.89-94
• /
• 1995

Considering the planar structure and nonpolar properity of benzo(a)pyrene(B(a)p) and the planar heme part of cytochrome P-450, stacking interaction is probable. MO calculation on B(a)P and heme part of cytochrome P-450 were carried out to dertermine probable stacking interaction models. In this case, orbital interaction is most important. Accordingly, the stacking positions have high eigen vector in frontier orbital and boning type between two molecules. In this way, five probate models were selected and examined by MN2 and MO method. The most probable .stacking interaction model which is the 4, 5, 6 positions of B(a)P overlap carbon atom and pyrrole ring of ring of heme group was determined.

• Journal of Integrative Natural Science
• /
• v.8 no.3
• /
• pp.192-203
• /
• 2015

In view of the growing medicinal importance of pyrazole and its derivatives, the single crystal X-ray diffraction study was carried out for the potential active 2-Benzyl-3-[3-(4-bromo-phenyl)-1-phenyl-1H-pyrazol-4yl]-4,6-dioxo-5-phenyl-octahydro-pyrrolo[3,4-C]pyrrole-1-carboxylic acid ethyl ester ($C_{37}H_{31}BrN_4O_4$, H2O). In the title compound are two molecules exist in the asymmetric unit. It crystallizes in the monoclinic space group $P{\hat{i}}$ with unit cell dimension $a=13.361(18){\AA}$, $b=13.424(17){\AA}$ and $c=21.649(2){\AA}$ [${\alpha}=80.745(9)^{\circ}$, ${\beta}=79.770(10)^{\circ}$ and ${\gamma}=60.788(6)^{\circ}$]. The pyrazole ring adopts planar conformation. The sum of the bond angles at nitrogen atom of the pyrazole ring indicates the $Sp^2$ hybridized state. The crystal structure is stabilized by intramolecular C-H...O hydrogen bond interaction.

• Polymer(Korea)
• /
• v.34 no.5
• /
• pp.450-453
• /
• 2010

The electrical/optical properties and surface structures of polypyrrole (PPy) thin films, which were prepared by liquid phase polymerization (LPP) and vapor phase polymerization (VPP) of pyrrole using FTS as an initiatior are compared. The PPy thin film prepared by VPP showed superior surface resistance characteristics as compared with that prepared by LPP. We investigated the relation between surface morphology of PPy film and surface resistance by surface characteristic analysis. The surface of PPy thin film prepared by VPP was smoother than that prepared by LPP. Micro-patterned PPy thin film could be prepared effectively using VPP-combined ink-jet printing and soft lithography.

• Journal of the Korean Electrochemical Society
• /
• v.5 no.3
• /
• pp.164-167
• /
• 2002

ABS/Polypyrrole composite film has been synthesized by means of electrochemical polymerization in order to enhance the oxidant stability by using ABS(Acrylonitrile-Butadiene-Strene) as a host-polymer. While the acetonitrile as a solvent swells the host-polymer ABS on Pt plate, and then the pyrrole in an electrolyte penetrates the Pre-coated ABS film during electrochemical Polymerization. Comparing with the sin91e-component Polypynole film, the resulting conducting ABS/PPy composite nim shows the good reliability for the uniform resistance and the enhancement of the oxidant stabilization.