Polymer-dispersant-stabilized Ag nanofluids for heat transfer applications

One-step wet chemical method has been employed for the synthesis of silver (Ag) nanofluids followed by the preparation of polyvinyl pyrrolidone (PVP), polyvinyl alcohol (PVA) and PVP–PVA mixed-dispersant-stabilized nanofluids by varying the concentration ratio of dispersants for the viscosity and th...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2021-10, Vol.146 (2), p.601-610
Main Authors: Pavithra, K. S., Gurumurthy, S. C., Yashoda, M. P., Mateti, Tarun, Ramam, Koduri, Nayak, Roopa, Murari, M. S.
Format: Article
Language:English
Subjects:
Analytical Chemistry
Chemistry
Chemistry and Materials Science
Dispersants
Electric properties
Field emission microscopy
Heat conductivity
Heat transfer
Inorganic Chemistry
Measurement Science and Instrumentation
Nanofluids
Nanoparticles
Particle size distribution
Photon correlation spectroscopy
Physical Chemistry
Polymer industry
Polymer Sciences
Polymers
Polyvinyl alcohol
Povidone
Silver
Thermal conductivity
Zeta potential
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Summary:One-step wet chemical method has been employed for the synthesis of silver (Ag) nanofluids followed by the preparation of polyvinyl pyrrolidone (PVP), polyvinyl alcohol (PVA) and PVP–PVA mixed-dispersant-stabilized nanofluids by varying the concentration ratio of dispersants for the viscosity and thermal conductivity analysis. The optical absorption studies indicate the presence of nanoparticles in the prepared fluids (or the formation of the silver nanoparticles). The shape and size of the nanoparticles are confirmed by the field emission scanning electron microscopy, and the particle size distribution and zeta potential analysis were carried out by using dynamic light scattering. It is observed that the thermal conductivity of Ag nanofluids increases with an increase in the dispersant concentration with respect to the temperature. The maximum thermal conductivity enhancement of Ag nanofluids was observed in the presence of an equimolar ratio of PVP–PVA (1:1:1) blends as stabilizers. Graphic abstract
ISSN:1388-6150
1588-2926
DOI:10.1007/s10973-020-10064-8