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RISS 인기검색어
- 검색키워드
- 저자 : G. C. Nayak (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Investigations on Doping of Poly(3-methyl-thiophene) Composites for Supercapacitor Applications
G. Karthikeyan,S. Sahoo,G. C. Nayak,C. K. Das 한국고분자학회 2012 Macromolecular Research Vol.20 No.4
Zinc ion (Zn2+)-doped poly(3-methyl-thiophene)/multi-walled carbon nano tubes (MWCNT) composites (M-PMT-ZN) and poly(3-methyl-thiophene)/MWCNT composites (M-PMT) were synthesized by in situ chemical oxidative polymerization and investigated as electrode material for supercapacitors. The interactions of Zn2+ ions with sulfur sites on the polymer chains were characterized by Fourier transform infrared spectroscopy. The morphology of the nanocomposites was characterized by scanning electron microscopy and high resolution transmission electron microscopy. The electrochemical properties were investigated using cyclic voltammetry, cyclic chargingdischarging tests, and electrochemical impedance spectroscopy in a three-electrode system. Use of M-PMT-ZN resulted in a higher specific capacitance of 235 F/g. The specific capacitance retention after 500 cycles on M-PMTZN was also higher compared with that of the M-PMT composite. These results indicate that transition metal ion doping enhances the electrochemical properties of the conducting polymer.
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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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Development of PMMA/TiO2 nanocomposites as excellent dental materials
Md. Alamgir,Ashis Mallick,G. C. Nayak,Santosh K. Tiwari 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.10
This paper presents the application of the in-situ synthesized nanocomposites of poly (methyl methacrylate) (PMMA) and TiO 2 for use as dental materials. TiO 2 nanoparticles with different percentages (1wt% and 2 wt%) were blended with PMMA through a melt compounding process. The prepared nanocomposites were characterized by a micro-indentation test, scratch test, and field emission scanning electron microscopy analysis. The effects of different vol. % of TiO 2 on the mechanical properties of the composites were studied. The evaluation of the mechanical properties of the composites revealed that the utilization of TiO 2 as a reinforcing agent strengthened the polymer. The morphological observation demonstrated the presence of significant adhesion between TiO 2 and the polymer matrixes with a homogeneous distribution of TiO 2 in the polymer matrix. The proper compatibilization between TiO 2 and the polymer matrix enhanced the mechanical properties. Overall, this work may pave the way for the production of a new compatibilized TiO 2 -based blend for dental applications.
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HARMONIC INVEX SETS AND GENERALIZED HARMONIC VARIATIONAL INEQUALITY PROBLEMS
S. N. Mishra,P. K. Das,G. C. Nayak 경남대학교 수학교육과 2018 Nonlinear Functional Analysis and Applications Vol.23 No.1
In this paper, we have defined various type of generalized harmonic variationalinequality problems in harmonic invex set and studied their existence theorems under certainconditions.
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