Microwave synthesis of silver nanofluids with polyvinylpyrrolidone (PVP) and their transport properties
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Microwave synthesis has been applied to prepare stable silver nanofluids in ethanol by reduction of AgNO3 with polyvinylpyrrolidone (PVP), used as stabilizing agent, having Ag concentrations of 1% by volume. The nanofluids were characterized by UV-vis spectroscopy, Fourier transform infrared, energy-dispersive X-ray spectroscopy, and transmission electron microscopy and systematically investigated for refractive index, electrical and thermal conductivity, and viscosity for different polymer concentrations. The size of nanoparticles was found to be in the range of 30–60 nm for two different salt-to-PVP ratios. For higher concentration of polymer in nanofluid, nanoparticles were 30 nm in size showing increase in thermal conductivity but a decrease in viscosity and refractive index, which is due to the polymer structure around nanoparticles. Thermal conductivity measurements of nanofluids show substantial increment in the thermal conductivity of nanofluid relative to the base fluid and nonlinear enhancement over the 283–323 K temperature range. Rheology of nanofluids was studied at room temperature showing effect of polymer on viscosity and confirming the Newtonian behavior of nanofluid.
KeywordsSilver nanofluid Microwave synthesis Thermal conductivity PVP Viscosity Rheology
Authors are thankful to Vice Chancellor, Defense Institute of Advanced Technology (DIAT), Deemed University, Girinagar, Pune, India, for granting permission to publish this work. The authors sincerely appreciate the keen interest of Shree V.C. Janu Chemistry Department (DIAT) in the present work. Authors are also thankful to AFMC Pune, India, for TEM of samples.
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