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In this work, we have synthesized Au/Pt bimetallic nanoparticle via chemical route. The fabricated nanoparticles were characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Frequency and concentration dependent ultrasonic attenuation in present nanofluids and particle size distribution Au/Pt bimetallic nanoparticle in the base fluids have been determined by acoustical particle sizer (APS-100). The obtained XRD pattern confirmed the formation of Au/Pt bimetallic nanoparticle. Comparative study of different technique to determine particle size of nanoparticles has been done. The results obtained by XRD and TEM were consistent with acoustical particle sizer. In present days ultrasonic wave is widely used in non-destructive techniques for material characterization. The present analysis highlights the significance of acoustical particle sizer for fast and non-destructive approach to determine particle size distribution of nanoparticles in base fluids.
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