CuAg and AuAg bimetallic nanoparticles for catalytic and heat transfer applications

Dsouza, Anusha and Shilpa, M P and Gurumurthy, S C and Nagaraja, B S and Mundinamani, Shridhar and Ramam, Koduri and Gedda, Murali and Murari, M S (2021) CuAg and AuAg bimetallic nanoparticles for catalytic and heat transfer applications. Clean Technologies and Environmental Policy, 23. pp. 2145-2155. ISSN 1618-954X

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Abstract

Bimetallic nanoparticles (BNPs) have drawn signifcant attention due to their numerous applications. They demonstrate enhanced optical, electrical, thermal, and catalytic properties due to the synergistic efects of monometals present in them. In this work, CuAg and AuAg BNPs have been synthesized using a facile and economical chemical reduction method. Optical characterization was carried out using UV–visible spectroscopy, and efect of pH on optical absorbance was studied. For CuAg and AuAg BNPs, optimum pH was observed to be at 9.4 and 6.39, respectively. Morphological investigation confrms the average diameters of CuAg and AuAg BNPs were to be 65 nm and 30 nm, respectively. Photocatalytic property illustrates the reduction of 4-nitrophenol to 4-aminophenol with a 92% conversion percentage in the presence of CuAg BNPs in 4 min, and rate constant for the reaction was measured to be 8.98× 10–3 s −1. But for the AuAg BNPs, the conversion percentage was 97% in 8 min and rate constant was found to be 7.95× 10–3 s −1. Thermal conductivity and viscosity measurements of the nanofuids obtained with CuAg and AuAg BNPs have ascertained them to be efcient candidates for the heat transfer and catalytic applications.

Item Type: Article
Uncontrolled Keywords: Bimetallic nanoparticles · Thermal conductivity · Viscosity · Catalytic activity · Optical properties · Gold · Silver
Subjects: Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 03 Mar 2022 09:12
Last Modified: 03 Mar 2022 09:12
URI: http://eprints.manipal.edu/id/eprint/158394

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