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RISS 인기검색어
- 검색키워드
- 저자 : Anandhavelu, S. (검색결과 3 건)
- 무료
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Chitin and Chitosan Based Hybrid Nanocomposites for Super Capacitor Applications
Anandhavelu, S.,Dhanasekaran, V.,Sethuraman, V.,Park, Hui Joon American Scientific Publishers 2017 Journal of nanoscience and nanotechnology Vol.17 No.2
<P>In this paper, we report a facile low-cost synthesis of the chitin and chitosan-based hybrid nanocomposites for supercapacitors. The chitosan and chitin based hybrid composites functional group analysis, structural, optical and morphological properties were characterized using FTIR spectroscopy, Raman spectroscopy, UV-vis spectroscopy and scanning electron microscopy (SEM), respectively. Specific capacitance values of hybrid composites were calculated using cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge-discharge analysis. The hybrid composites asymmetric supercapacitor performance was perceived in the range of -0.2 to 1.0 V. The specific capacitance value was achieved at 542.63 F g(-1) at current density value of 0.1 A g(-1) for CH-GO-ZnO/PANI hybrid composites. The prepared hybrid nanocomposites exhibit good supercapacitive performance and long-term cycle stability. These results demonstrate the potential of the CH-GO-ZnO/PANI hybrid nanocomposites as a high-performance supercapacitors.</P>
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Optical and Structural Properties of Solvent Free Synthesized Starch/Chitosan-ZnO Nanocomposites
Sanmugam, Anandhavelu,Vikraman, Dhanasekaran,Venkatesan, Sethuraman,Park, Hui Joon Hindawi Limited 2017 Journal of nanomaterials Vol.2017 No.-
<P>The objective of this work is to develop an environmentally friendly method for preparation of ZnO nanocomposites. ZnO nanocomposites were prepared by three natural fibers such as coir, sawdust, and chitosan using aqueous solution of zinc chloride and sodium hydroxide. The functional groups of ZnO, C=O for polysaccharide, and N-H bending vibration of amine were confirmed by FTIR spectroscopy. A new high intensity absorption band has been observed at 424 cm<SUP>−1</SUP> which corresponds to the E2 mode of hexagonal ZnO. The crystallinity and phase formation of coir, chitosan, and sawdust combined ZnO nanocomposites were confirmed by X-ray diffraction patterns. XRD patterns revealed the polycrystalline nature of ZnO composites belonging to the hexagonal phase with (101) preferential lattice orientation. The microstructural parameters were calculated for coir, chitosan, and saw wood combined ZnO composites. Also texture coefficients were estimated for all the diffraction lines of ZnO based nanocomposites. SEM and TEM analyses confirmed evenly distributed nanosized grains in the ZnO composites. The UV-Vis absorption spectra were observed where the blue shift absorption peak was at 334 nm. The optical band gap values were estimated in the range of 3.18-3.26 eV. The emission peak was observed at ~388 nm and ~463 nm by photoluminescence spectroscopy.</P>
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Andiappan, Kavitha,Sanmugam, Anandhavelu,Deivanayagam, Easwaramoorthy,Karuppasamy, K.,Kim, Hyun-Seok,Vikraman, Dhanasekaran Elsevier 2019 INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES Vol.124 No.-
<P><B>Abstract</B></P> <P>We used the condensation chemistry with anthracene‑9‑carbaldehyde and 3,4‑diaminopyridine to form Schiff base (SB) ligand, <I>N</I> <SUP>2</SUP>,<I>N</I> <SUP>3</SUP>‑bis (anthracen‑9‑ylmethylene) pyridine‑3,4‑diamine incorporating Er, Pr and Yb rare earth metals to form a series of SB complexes. Surface, structure, thermal, and optical properties of the resulting complexes were investigated using a variety of tools. The characteristic luminescence properties were observed after rare earth metal inclusions in SB. Antibacterial studies were performed against <I>Bacillus subtilis</I>, <I>Staphylococcus aureus</I>, <I>Escherichia coli</I> and <I>Pseudomonas aeruginosa</I> in terms of zone of inhibition for SB complexes. The SB-Pr complexes showed better immune behavior against all the pathogens than the other SB metal complexes.</P>
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