Journal
ULTRASONICS
Volume 48, Issue 6-7, Pages 591-593Publisher
ELSEVIER
DOI: 10.1016/j.ultras.2008.06.008
Keywords
Nanofluids; Ultrasonic attenuation; Thermal conductivity; Colloidal solution; Pulse-echo-technique
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A polymer colloidal solution having dispersed nanoparticles of Cu and Au metals have been developed using a novel chemical method. Average size of the nanoparticles could be varied in the 4-10 nm range by conducting the reaction at an elevated temperature of 50-70 degrees C. Colloidal solutions of representative concentrations of 0.1-2.0 wt% Cu/Au contents in the primary solutions are used to study the modified ultrasonic attenuation and ultrasonic velocity in PVA polymer molecules on incorporating the Cu/Au particles. A characteristic behaviour of the ultrasonic velocity and the attenuation are observed at the particular temperature/particle concentration. The results demonstrate that the primary reaction during the nanoparticles-PVA colloidal formation occurs in divided groups in small micelles. The results are analyzed predicting the enhanced thermal conductivity of the samples. (C) 2008 Elsevier B. V. All rights reserved.
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