Study of Ultrasonic Attenuation and Thermal Conduction in Bimetallic Gold/Platinum Nanofluids : Effect of thermal conductivity on ultrasonic attenuation of gold and gold/platinum nanofluids

Here, we report the frequency dependent ultrasonic attenuation of monometallic gold and bimetallic gold/platinum based aqueous nanofluids (NFs). The as-synthesised bimetallic NFs (BMNFs) revealed less resistance to ultrasonic waves compared to the monometallic NFs. Thermal conductivity of both NFs t...

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Bibliographic Details
Published in:Johnson Matthey technology review 2021-10, Vol.65 (4), p.556-567
Main Authors: Verma, Alok Kumar, Yadav, Navneet, Singh, Shakti Pratap, Dey, Kajal Kumar, Singh, Devraj, Yadav, Raja Ram
Format: Article
Language:English
Subjects:
Bimetals
Gold
Heat conductivity
Heat transfer
Industrial applications
Morphology
Nanofluids
Nanoparticles
Platinum
Spectrum analysis
Thermal conductivity
Ultrasonic attenuation
Wave resistance
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Summary:Here, we report the frequency dependent ultrasonic attenuation of monometallic gold and bimetallic gold/platinum based aqueous nanofluids (NFs). The as-synthesised bimetallic NFs (BMNFs) revealed less resistance to ultrasonic waves compared to the monometallic NFs. Thermal conductivity of both NFs taken at different concentrations revealed substantial conductivity improvement when compared to the base fluid, although gold/platinum showed lesser improvement compared to gold. Characterisation of the as-synthesised nanoparticles (NPs) and fluids was carried out with X-ray diffraction (XRD), ultraviolet-visible (UV-vis) spectroscopy, transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDS). The distinct two-phase bimetallic nature of gold/platinum, its two plasmonic band optical absorption features and the spherical morphology of the particles were shown. The findings were correlated with the observed thermal and ultrasonic behaviour and proper rationalisation is provided. It was revealed that the comparatively lesser thermal conductivity of gold/platinum had direct implication on its attenuation property. The findings could have important repercussions in both industrial applications and in the mechanistic approach towards the field of ultrasonic attenuation in NFs.
ISSN:2056-5135
2056-5135
DOI:10.1595/205651321X16038755164270