• B Viswanathan

      Articles written in Bulletin of Materials Science

    • Helium implantedAlHf as studied by181Ta TDPAC

      R Govindaraj K P Gopinathan B Viswanathan

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      Time differential perturbed angular correlation (TDPAC) measurement onAlHf reference sample has shown that a fraction 0.88 of probe nuclei are defect free and are occupying the substitutional sites in fcc Al matrix, and the remaining are associated with Hf solute clusters. Measurements on helium implanted sample indicate the binding of helium associated defects by Hf solute clusters. Isochronal annealing measurements indicate the dissociation of the helium implantation induced defects from Hf solute clusters for annealing treatments beyond 650 K. On comparison of the present results with that reported inCuHf subjected to identical helium implantation, it is inferred that the Hf solute clusters inAlHf bind less strongly the helium associated defects than inCuHf.

    • Preparation of Pt-Ru bimetallic catalyst supported on carbon nanotubes

      B Rajesh K Ravindranathan Thampi J -M Bonard B Viswanathan

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      The template carbonization of polyphenyl acetylene yields hollow, uniform cylindrical carbon nanotubes with outer diameter almost equal to pore diameter of the template used. High resolution transmission electron microscopic investigation reveals that Pt-Ru nanoparticles are highly dispersed inside the tube with an average particle size of 1.7 nm.

    • Polyoxometalate based soft chemical route for preparation of Pt nanorods and self-assemblies

      S Shanmugam B Viswanathan T K Varadarajan

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      A soft chemical route is described for the preparation of platinum nanorods and self-assemblies over photochemically reduced polyoxometalate (silicotungstate) containing composite films. Transmission electron microscopy shows that the diameters of the platinum nanorods are around 55–60 nm. The formation of platinum nanorods on solid–liquid interface reactions was explained on the basis of single site growth mechanism and diffusion limitation aggregation process.

    • Fabrication and characterization of uniform TiO2 nanotube arrays by sol–gel template method

      T Maiyalagan B Viswanathan U V Varadaraju

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      TiO2 nanotubes have been synthesized by sol–gel template method using alumina membrane. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, UV absorption spectrum and X-ray diffraction techniques have been used to investigate the structure, morphology and optical properties of TiO2 nanotubes. SEM image showed that TiO2 nanotubes obtained were ordered and uniform. The diameter and length of the nanotubes were decided by the pore size and thickness of alumina template. Raman and XRD measurements confirmed the crystallinity and anatase phase of the TiO2 nanotubes. The optical absorption measurement of TiO2 nanotubes exhibits a blue shift with respect to that of the bulk TiO2 owing to the quantum size effect.

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      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

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      Posted on July 25, 2019

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