Browsing by Author "Lingamaneni, Rama Krishna."

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Fabrication of ceramic coatings on the biodegradable ZM21 magnesium alloy by PEO coupled EPD followed by laser texturing process
    (Journal of Magnesium and Alloys, 2020-11) Hariprasad, S.; Saikiran, A.; Premchand, C.; Lingamaneni, Rama Krishna.; Rameshbabu, N.
    Zirconia (ZrO 2 ) incorporated ceramic coatings were fabricated on biodegradable ZM21 Mg alloy by the PEO coupled with EPD process. Subsequently, the sample surface was modified by laser texturing to improve the corrosion resistance, roughness and cell proliferation and growth properties. The corrosion performance of the fabricated samples along with the substrate was studied by electrochemical measurements under simulated body fluid (SBF) environment. The cell direct contact assay was conducted for the substrate and fabricated samples using L -929 mouse fibroblast cells for 24 h. The phase contrast images of cell direct contact assay revealed that fabricated samples exhibited better contact and response with the fibroblast cells, compared to the substrate. The addition of nanoparticles in the PEO process, called PEO coupled EPD process, resulted in attaining a higher thickness and improved corrosion performance of the samples than the PEO coated samples. Among all the samples, laser surface textured PEO, and PEO-EPD coated samples unveiled enhanced corrosion resistance, cell growth, thereby enabling it as a suitable prototype for biodegradable implant applications. © 2020 Published by Elsevier B.V. on behalf of Chongqing University. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ) Peer review under responsibility of Chongqing University
  • No Thumbnail Available
    Item
    Facile preparation of immobilised visible light active W–TiO /rGOcomposite photocatalyst by plasma electrolytic oxidation process
    (Physica B: Condensed Matter, 2022-04) Manojkumar, P.; Lokeshkumar, E.; Premchand, C.; Saikiran, A.; Lingamaneni, Rama Krishna.; Rameshbabu, N.
    A highly efficient immobilised W–TiO/rGO composite photocatalyst was prepared as a coating on titaniumusing plasma electrolytic oxidation (PEO) with particle addition. The high dopant concentration in TiO resulted in smaller crystallite size , increased lattice strain, and dislocation density. The optimum Wcontaining G6W sample has improved electron mobility, higher charge carrier separation efficiency, andlower electron-hole recombination rate. This can be ascribed to the number of different defect centresemerging from tungsten interstitials and higher oxygen vacancies in the TiO structure. The catalystexhibited enhanced photocatalytic degradation efficiency (93%) of methylene blue dye than the pure TiO ,which was attributed to the synergetic effect of 2-D structured rGO and the changes incorporated upon tungsten interstitials in the TiO. The present research concludes that W–TiO/rGO photocatalyst by PEOprocess can be a good candidate for efficient, low cost, reusable, and visible-light-driven immobilisedphotocatalyst for textile wastewater treatment.