• A SARKAR

      Articles written in Bulletin of Materials Science

    • Estimation of particle size distribution of nanoparticles from electrical characteristics

      ARNAB GANGOPADHYAY ADITI SARKAR A SARKAR

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      An indirect method of estimation of size distribution of nanoparticles in a nanocomposite is proposed inthis paper. The present approach exploits DC electrical current–voltage characteristics (CVC) of ZnO nanocompositespecimen in bio-polymer background. The nature of DC CVC is found to be oscillatory with respect to applied voltage.The nature of CVC is a consequence of Coulomb blockade (CB) phenomena of electrical conduction through atiny nanoparticle. Considering the ZnO nanocomposites to be spherical, Coulomb-blockade model of quantum dot isapplied here. The size distribution of particle is estimated from that model and compared with the results obtainedfrom AFM and XRD analyses. The results from CVC are found to be consistent with these conventional microscopicresults.

    • Investigation of the mechanical properties of graphitic carbon nitride pellet and film by simulation and nanoindentation experiments

      A IBRAHIM U B MEMON S P DUTTAGUPTA R K SINGH RAMAN A SARKAR

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      In this article, a graphic carbon nitride (g-C$_3$N$_4$) pellet (bulk) and a film on a glass substrate were investigated. Further mechanical properties were extracted with the help of the obtained load–displacement curve. To evaluate theexperimental result, commercially available finite-element method was applied using proper ABAQUS simulation procedures. The appropriate boundary conditions were taken into account to get the required load–displacement curve of that material. A conical indenter tip with an angle of 70.2°was used to closely match the tip geometry with the actual tip used in the nanoindentation process. Properties such as hardness, stiffness coefficient, elastic modulus and stress–strain of the material were determined by the load–displacement curve. The relationship between hardness and penetration depth was studied.

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    • Dr Shanti Swarup Bhatnagar for Science and Technology

      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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