Faculty Publications
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Item A direct approach towards synthesis of copper nanofluid by one step solution phase method(Elsevier B.V., 2024) Kumar, S.P.; Shenoy, U.S.; Bhat, D.K.We adopted a simple one step approach to synthesize copper nanofluids by reduction of copper sulphate with fructose. The solution phase synthetic technique led to the formation of copper particles whose size was restricted to the nanodimensions by use of sodium lauryl sulphate. We studied the effect of various parameters on the formation and dispersion of the copper nanoparticles in the base fluid containing a 1:1 mixture of water and ethylene glycol. The resulting Newtonian nanofluid was found to be highly stable with increased thermal conductivity. Thus, the applied technique is found to be simple, economic, and extendable to other class of materials to obtain stable dispersions of nanofluids for heat transfer applications. © 2024 Elsevier B.V.Item In-situ synthesis of cuprous oxide nanofluid using ribose for enhanced thermal conductivity and stability(Elsevier B.V., 2024) Bhat, D.K.; Kumar, S.P.; Shenoy, U.S.Enhancing the thermal properties of conventional heat transfer fluids represents a significant technological challenge. In this context, nanofluids have emerged as a promising solution, emphasizing the need for simpler and more convenient synthesis methods. This study introduces a novel, eco-friendly, one-step synthesis method, overcoming the complexities of traditional two-step processes. The resulting nanofluid generated by using ribose as a reducing agent, consists of cuprous oxide particles at the nano scale, and the fluid itself exhibits Newtonian behavior. With an impressive thermal conductivity of 3.052 W m−1 K−1, the nanofluid exhibits stability for a noteworthy 4-month duration, achieved through the strategic addition of sodium lauryl sulfate. This breakthrough positions the nanofluid as a compelling option for diverse applications in thermal energy storage and management. © 2024 Elsevier Inc.Item Design, synthesis, and characterization of stable copper nanofluid with enhanced thermal conductivity(Elsevier Ltd, 2024) Bhat, D.K.; Kumar, S.P.; Shenoy, U.S.Nanofluids, which are liquids that contain small particles with dimensions in the nanometer range, have gained significant attention in recent years due to their enhanced thermal properties in various applications such as thermal management and energy conversion. This article aims to provide insights into the design and optimization of copper nanofluid synthesis and it investigates the thermal and rheological properties at varying concentrations of nanoparticles and temperature. The method involves simultaneous use of fructose as reducing agent and polyvinyl pyrrolidone as stabilizing agent to enable synthesis of copper nanofluid from copper sulphate. The resulting Newtonian nanofluid had a stability of 3 months with enhanced thermal conductivity of up to ∼500 % compared to 1:1 mixture of water and ethylene glycol which served as the base fluid. The approach is suitable for producing large volume of nanofluid using cost effective materials. © 2024 Elsevier LtdItem Fructose-mediated single-step synthesis of copper nanofluids with enhanced stability and thermal conductivity for advanced heat transfer applications(Taylor and Francis Ltd., 2025) Bhat, D.K.; Kumar, S.P.; Shenoy, U.S.A precisely controlled solution-phase approach was employed to synthesize copper nanofluid through the reduction of copper sulfate by fructose in the presence of cetyltrimethylammonium bromide, utilizing a mixture of water and ethylene glycol in 1:1 ratio as the base fluid. We delved into the nanofluid’s thermal conductivity and rheological properties, with a keen interest on particle size and reaction rates that exhibited significant sensitivity to variations in reaction parameters. The homogeneous dispersion of nanoparticles in the base fluid resulted in an augmentation of thermal conductivity to 2.31 Wm?1K?1 for particle loading fraction of 0.19%, with a never before achieved stability of 9 months. This method has proven to be not only straightforward and dependable but also efficient for the rapid synthesis of highly stable Newtonian nanofluids, underscoring the nanofluid’s potential for highly powerful cooling applications. © 2024 Taylor & Francis Group, LLC.