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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.
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>
Nd2O3: novel synthesis and characterization
Yuvakkumar, R.,Hong, S. I. Springer Science + Business Media 2015 Journal of sol-gel science and technology Vol.73 No.2
<P>The present work was focused on producing sustainable Nd2O3 nanoparticles for inhibiting human breast cancer cells. Novel synthesis route was described. Raman, PL, XRD, FTIR, XPS and TEM characterization was explored. Observed Raman F-g and A(g) + E-g combination modes confirmed Nd2O3. PL emission bands around 352-392 nm (UV), 429-472 nm (blue), 580 nm (green) and 650 nm (red) further confirmed Nd2O3. Highest incubation period clearly exhibits (100) oriented strong XRD characteristic Nd2O3 peak. 413 and 630 cm(-1) peaks represent IR characteristic metal-oxygen (Nd-O) vibrations. Nd-3d peak shifted to higher binding energy upon increasing incubation period substantiate the presence of bigger particles due to rich Nd structure. 7 days incubation revealed agglomerated Nd2O3 particles (200 nm). 1 day incubated 500 (A mu g/ml) Nd2O3 dosage could be used as an effective biocompatibility material.</P>
Yuvakkumar, R.,Suresh, J.,Nathanael, A.J.,Sundrarajan, M.,Hong, S.I. Elsevier 2014 Materials Science and Engineering C Vol.41 No.-
In the present investigation, we report a sustainable novel green synthetic strategy to synthesis zinc oxide nanocrystals. This is the first report on sustainable biosynthesis of zinc oxide nanocrystals employing Nephelium lappaceum L., peel extract as a natural ligation agent. Green synthesis of zinc oxide nanocrystals was carried out via zinc-ellagate complex formation using rambutan peel wastes. The successful formation of zinc oxide nanocrystals was confirmed employing standard characterisation studies. A possible mechanism for the formation of ZnO nanocrystals with rambutan peel extract was also proposed. The prepared ZnO nanocrystals were coated on the cotton fabric and their antibacterial activity were analyzed. ZnO nanocrystals coated cotton showed good antibacterial activity towards Escherichia coli (E. coli), gram negative bacteria and Staphylococcus aureus (S. aureus), gram positive bacteria.
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.,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.
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>