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Macroparticles Reduction Using Filter Free Cathodic Vacuum Arc Deposition Method in ZnO Thin Films.
Yuvakkumar, R,Peranantham, P,Nathanael, A Joseph,Nataraj, D,Mangalaraj, D,Hong, Sun Ig American Scientific Publishers 2015 Journal of Nanoscience and Nanotechnology Vol.15 No.3
<P>We report a new method to reduce macroparticles in ZnO thin films using filter free cathodic vacuum arc deposition without using any cooling arrangements operated at low arc current. The detailed mechanism has been proposed to reduce macroparticles during thin film deposition. The successful reduction of macroparticles was confirmed employing FESEM-EDX studies. FESEM images of ZnO thin films deposited with cathode spot to substrate distance from 10 to 20 cm revealed that the population of the macroparticles were reduced with the increase of cathode spot to substrate distances at low arc current. The prepared ZnO films were characterised and showed good structural and optical properties.</P>
Baddeleyite Type Monoclinic Zirconium Oxide Nanocrystals Formation
Yuvakkumar, R.,Hong, Sun Ig Trans Tech Publications 2015 Advanced materials research Vol.1102 No.-
<P>We report successful synthesis of baddeleyite type monoclinic zirconium oxide nanocrystals formation. The product mixture of zirconium incubated at room temperature for 7 days were thoroughly investigated employing X-ray diffraction, Raman spectroscopy and transmission electron microscopy studies. XRD and Raman studies revealed the formation of baddeleyite type monoclinic zirconium oxide nanocrystals. TEM studies revealed the nanocrystal formation with size ranging from 100 nm to 200 nm.</P>
Yuvakkumar, R.,Suresh, J.,Nathanael, A.J.,Sundrarajan, M.,Hong, S.I. North-Holland 2014 Materials letters Vol.128 No.-
We report sustainable novel simple green synthetic strategy to synthesize NiO nanocrystals. This is first report on sustainable biosynthesis of NiO nanocrystals employing Nephelium lappaceum L., peel extract as a natural ligation agent. Green synthesis of NiO nanocrystals was carried out via nickel-ellagate complex formation using rambutan wastes. Successful formation of NiO nanocrystals was confirmed. Possible mechanism of NiO nanocrystals formation using rambutan extract was proposed. Prepared NiO nanocrystals were coated on cotton fabric and their antibacterial activity was analyzed.
Yuvakkumar, R.,Suresh, J.,Saravanakumar, B.,Joseph Nathanael, A.,Hong, S.I.,Rajendran, V. Pergamon 2015 Spectrochimica acta. Part A, Molecular and biomole Vol.137 No.-
A naturally occurring rambutan peel waste was employed to synthesis bioinspired zinc oxide nanochains. Rambutan peels has the ability of ligating zinc ions as a natural ligation agent resulting in zinc oxide nanochains formation due to its extended polyphenolic system over incubation period. Successful formation of zinc oxide nanochains was confirmed employing transmission electron microscopy studies. About 60% and ~40% cell viability was lost and 50% and 10% morphological change was observed in 7 and 4days incubated ZnO treated cells compared with control. Moreover, 50% and 55% of cell death was observed at 24 and 48h incubation with 7days treated ZnO cells and hence alters and disturbs the growth of cancer cells and could be used for liver cancer cell treatment.
폐과일껍질을 이용한 친환경 NiO 나노분말 합성 및 향균특성 연구
R. Yuvakkumar,송재숙,홍순익 한국재료학회 2018 한국재료학회지 Vol.28 No.1
This study reports an environment-friendly synthetic strategy to process nickel oxide nanocrystals. A mesoporous nickel oxide nanostructure was synthesized using an environmentally benign biomimetic method. We used a natural rambutan peel waste resource as a raw material to ligate nickel ions to form nickel-ellagate complexes. The direct decomposition of the obtained complexes at 700 oC, 900 oC and 1100 oC in a static air atmosphere resulted in mesoporous nickel oxide nanostructures. The formation of columnar mesoporous NiO with a concentric stacked doughnuts architecture was purely dependent on the suitable direct decomposition temperature at 1100 oC when the synthesis was carried out. The prepared NiO nanocrystals were coated on cotton fabric and their antibacterial activity was also analyzed. The NiO nanoparticle-treated cotton fabric exhibited good antibacterial and wash durability performance.
Structural and toxic effect investigation of vanadium pentoxide
Yuvakkumar, R.,Hong, S.I. Elsevier 2016 Materials Science and Engineering C Vol.65 No.-
<P>A facile inorganic complex synthesis route has been developed to synthesis V2O5 nanostructures. The effects of varying incubation time on the crystallinity and morphology of the V2O5 phase has been investigated. The obtained XRD result clearly revealed the pure orthorhombic V2O5 crystalline phase. Raman antiphase bridging V-O and chaining V-O stretching modes peaks at 686 and 521 cm(-1) attributed orthorhombic V2O5 characteristics. The V2(p3/2) peak at the binding energies of 517 eV and V2(p1/2) peak at 524 eV assigned to V5+ oxidation state. Bioinspired V2O5 nanostructures as a biocompatible material for anticancer agents show excellent cytotoxicity at higher V2O5 concentration. (C) 2016 Elsevier B.V. All rights reserved.</P>
R. Yuvakkumar,송재숙,신평우,홍순익 한국재료학회 2016 한국재료학회지 Vol.26 No.6
In this study, an environment-friendly synthetic strategy to process zinc oxide nanocrystals is reported. The biosynthesis method used in this study is simple and cost-effective, with reduced solvent waste via the use of fruit peel extract as a natural ligation agent. The formation of ZnO nanocrystals using a rambutan peel extract was observed in this study. Rambutan peels has the ability to ligate zinc ions as a natural ligation agent, resulting in ZnO nanochain formation due to the presence of an extended polyphenolic system over the whole incubation period. Via transmission electron microscopy, successful formation of zinc oxide nanochains was confirmed. TEM observation revealed that the bioinspired ZnO nanocrystals were spherical and/or hexagonal particles with sizes between 50 and 100 nm.