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<p>This study explores the eco-friendly synthesis of Ag nanoparticles derived from neem (Azadirachta indica and Melia Composita Willd). These nanoparticles were produced by subjecting neem leaves to pyrolysis in a muffle furnace, followed by sintering at elevated temperatures. Additionally, a hybrid of these two nanoparticles (Azadirachta indica 60% and Melia Composita Willd 40%) was prepared. The heat transport properties of Ag nanofluids were examined across various volume percentages (0.02%, 0.04%, and 0.06%) over temperatures ranging from 30 to 50&#xa0;°C, introducing a novel nanofluid category and highlighting the exceptional thermal stability of AgNPs. At a 0.06% concentration, Ag nanoparticles synthesized from Azadirachta indica, Melia Composita Willd, and their hybrid exhibited significant enhancements in thermal conductivity—14.39%, 30.01%, and 24.25%, respectively—compared to the base fluid at temperatures of 50&#xa0;°C and 45&#xa0;°C. Specific heat capacity increased with temperature but decreased with higher particle concentration, with Melia Composita Willd AgNPs at 0.02% showing the highest value, while dynamic viscosity peaked at 0.06% and was lowest at 0.02%.The Mouromtseff number was found to decrease with increasing temperature and nanoparticle concentration. These findings underscore the potential of green nanoparticles to enhance the properties of heat transfer fluids, making them suitable for energy-efficient heat exchanger applications with environmental benefits.</p>

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Eco-friendly synthesis and thermophysical characterization of silver nanofluids for heat transfer applications

  • 期刊论文

  • 发表日期：

    2025年10月8日

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  • D. Saravanan,
  • K. Sureshkumar

摘要

This study explores the eco-friendly synthesis of Ag nanoparticles derived from neem (Azadirachta indica and Melia Composita Willd). These nanoparticles were produced by subjecting neem leaves to pyrolysis in a muffle furnace, followed by sintering at elevated temperatures. Additionally, a hybrid of these two nanoparticles (Azadirachta indica 60% and Melia Composita Willd 40%) was prepared. The heat transport properties of Ag nanofluids were examined across various volume percentages (0.02%, 0.04%, and 0.06%) over temperatures ranging from 30 to 50 °C, introducing a novel nanofluid category and highlighting the exceptional thermal stability of AgNPs. At a 0.06% concentration, Ag nanoparticles synthesized from Azadirachta indica, Melia Composita Willd, and their hybrid exhibited significant enhancements in thermal conductivity—14.39%, 30.01%, and 24.25%, respectively—compared to the base fluid at temperatures of 50 °C and 45 °C. Specific heat capacity increased with temperature but decreased with higher particle concentration, with Melia Composita Willd AgNPs at 0.02% showing the highest value, while dynamic viscosity peaked at 0.06% and was lowest at 0.02%.The Mouromtseff number was found to decrease with increasing temperature and nanoparticle concentration. These findings underscore the potential of green nanoparticles to enhance the properties of heat transfer fluids, making them suitable for energy-efficient heat exchanger applications with environmental benefits.