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RISS 인기검색어
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- 저자 : Chapal (검색결과 5 건)
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Modified Graphene/Polyaniline Nanocomposites for Supercapacitor Application
Sumanta Sahoo,Chapal Kumar Das,G. Karthikeyan,G. C. Nayak 한국고분자학회 2012 Macromolecular Research Vol.20 No.4
This work explored the effect of graphene surface modification on the electrochemical performance of polyaniline-based nanocomposite. The surface modification of graphene was confirmed by Fourier transform infrared spectroscopy. Field emission scanning electron microscopy and high-resolution transmission electron microscopy showed uniform polyaniline coating of the modified graphene. The specific capacitance of the graphene/polyaniline composite was 242 F/g, but it decreased to 193 F/g after graphene modification. However, the capacitance retention increased from 86% to 89% after 500 cycles due to the graphene modification. The thermal stability of the composite also increased after the graphene modification.
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Indian Institute of Technology Delhi,Chapal Kumar Das,DEBASIS GHOSH 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.3
HCl doped polyaniline (PANI) and Ru (III) doped polyaniline (Ru/PANI) have been successfully prepared by in situ oxidative polymerization method and the effect of transition metal incorporation in PANI backbone is investigated thoroughly by the execution of Fourier transform infrared spectroscopy (FT-IR) and Raman study. Moreover, to examine the change in surface and bulk morphology of the composites, the field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) have also been carried out, which revealed the agglomerated state of PANI after being Ru doped. The confirmation of the presence of Ru in the composite is achieved by the energy dispersive X-ray spectroscopy (EDS). Also, the electrochemical characterizations namely, cyclic voltammetry (CV), ac impedance spectroscopy (EIS), cyclic charge–discharge (CCD), of the composite was performed by conventional three-electrode system using 1 M H2SO4 electrolyte. On doping with Ru, an increment of specific capacitance of PANI from 160 F/g to 425 F/g has been achieved with a considerable increase in cycle stability.
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Effect of fillers on morphological and wear characteristics of NR/HSR blends with E-glass fiber
Pal, Kaushik,Pal, Samir K.,Das, Chapal K.,Kim, Jin Kuk Elsevier 2012 MATERIALS AND DESIGN Vol.35 No.-
<P><B>Highlights</B></P><P>► The blends of high styrene rubber (HSR) and natural rubber (NR) with E-glass fiber was prepared. ► ISAF type of CB showed a significant effect on curing and mechanical properties. ► Blends containing ISAF type of CB showed high abrasion resistant against Du-Pont and DIN abrader and different mining rocks. ► Blends containing ISAF type of CB found to be the toughest rubber against rock.</P> <P><B>Abstract</B></P><P>The blends of high styrene rubber (HSR) and natural rubber (NR) with E-glass fiber was prepared using a blending technique in presence of different types of carbon black. The effect of filler on morphological and wear characteristics was studied. ISAF type of carbon black showed a significant effect on optimum cure time, cure rate index and mechanical properties by reacting at the interface between HSR and NR matrix. All the samples show only one melting peak on the DSC curve; this is attributed to the same backbone structure of the matrix and the carbon black reinforcement. The rate of degradation was almost the same up to 90% degradation for all the samples except NSF-1 and NSF-4, may be due to the mixing of N110 and N774 type of carbon black. Blends containing ISAF type of carbon black showed high abrasion resistant properties against Du-Pont abrader, DIN abrader and different mining rock surfaces and also is found to be the toughest rubber against all types of rock.</P>
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Influence of fillers on NR/SBR blends containing ENR-organoclay nanocomposites: morphology and wear.
Pal, Kaushik,Rajasekar, R,Pal, Samir Kumar,Kim, Jin Kuk,Das, Chapal Kumar American Scientific Publishers 2010 Journal of nanoscience and nanotechnology Vol.10 No.5
<P>In this study the Epoxidized natural rubber (ENR) and Organoclay (Cloisite 20A) were prepared by solution mixing process. The obtained nanocomposites were incorporated in Natural rubber (NR) and Styrene butadiene rubber (SBR) blends in presence of varying types of carbon black as reinforcing fillers. Morphology, curing characteristics, mechanical and thermal properties were characterized and analyzed. Also, the wear characteristics of the nanocomposites against Du-Pont abrader, DIN abrader and different mining rock surfaces were determined and discussed. The morphology of the organoclay incorporated in ENR shows a highly intercalated structure. ISAF type of carbon black shows a significant effect on curing and mechanical properties by reacting at the interface between SBR and NR matrix. All the samples show only one melting peak at same temperature on the DSC curve. Blends containing ISAF N234 type of carbon black shows high abrasion resistant properties against Du-Pont abrader, DIN abrader and different mining rock. The rubber compound containing 70 wt% of NR, 30 wt% of SBR and 10 wt% of ENR/nanoclay with ISAF N231 are found to be the toughest rubber against all types of rock under the present study.</P>
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