TITLE:
Synthesis and Ultrasonic Characterization of Cu/PVP Nanoparticles-Polymer Suspensions
AUTHORS:
Giridhar Mishra, Satyendra Kumar Verma, Devraj Singh, Pramod Kumar Yadawa, Raja Ram Yadav
KEYWORDS:
Nanofluids, Colloids, Thermal Properties, Nanoparticles, Ultrasonic Properties
JOURNAL NAME:
Open Journal of Acoustics,
Vol.1 No.1,
June
29,
2011
ABSTRACT: A polymer colloidal solution having dispersed nanoparticles of Cu metal has been developed using a novel chemical method. Colloidal solutions of representative concentrations of 0.2 to 2.0 wt% Cu-nanoparticles con-tents in the primary solutions were prepared to study the modified ultrasonic attenuation and ultrasonic velocity in polyvinyl alcohol (PVP) polymer molecules on incorporating the Cu-nanoparticles. The synthesized copper metal nanoparticles dispersed in the polymer solutions were characterized by UV-Visible absorption spectros-copy, X-ray diffraction (XRD) and Transmission electron microscopy (TEM). The nanofluid sample showed a symmetrical peak at 592 nm due to the surface plasmon resonance of the copper nanoparticles. XRD results confirmed that copper nanoparticles were crystalline in the colloidal solution. The TEM micrograph revealed spherical copper nanoparticles having diameter in the range 10 - 40 nm. A characteristic behaviour of the ultra-sonic velocity and the attenuation are observed at the particular temperature/particle concentration. It reveals that the colloidal suspension occurs in divided groups in the small micelles. The results are discussed in correlation with the thermophysical properties predicting the enhanced thermal conductivity of the samples.