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Here, we report the frequency dependent ultrasonic attenuation of monometallic Au and bimetallic Au/Pt based aqueous nanofluids (NFs). The as synthesized bimetallic nanofluids (BMNFs) revealed less resistance to ultrasonic wave compared to the monoatomic NFs. Thermal conductivity of both nanofluids taken at different concentrations, measured by the Hot Disk Thermal Constant Analyzer (TPS-500) revealed substantial conductivity improvement when compared to the base fluid, although Au/Pt showed lesser improvement compared to Au. We rationalized our obtained results with thorough characterization of the as synthesized nanoparticles/fluids with techniques such as XRD, UV-Vis, TEM, EDS etc. and some of the important information revealed were about the distinct two-phase bimetallic nature of Au/Pt, its two plasmonic band optical absorption feature and the spherical morphology of the particles. The findings were correlated with the observed thermal and ultrasonic behaviour and proper rationalization was provided. It was revealed that the comparatively lesser thermal conductivity of Yadav_06a_SC.docx ACCEPTED MANUSCRIPT 28/10/2020 Johnson Matthey Technol. Rev., 2021, 65, (x), yyy-zzz Page 2 of 25 Doi: 10.1595/205651321X16038755164270 Au/Pt had direct implication on its attenuation property. The findings could have important repercussions in both industrial applicational aspects and mechanistic approach towards the field of ultrasonic attenuation in nanofluids

johnson matthey technology review

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