title: Ultrasonic properties of nanoparticles-liquid suspensions.
abstract: 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.
authors.affiliation: Physics Department, University of Allahabad, Allahabad 211002, India. rryadav1@rediffmail.com
authors.forename: R R
authors.initials: RR
authors.lastname: Yadav
authors.forename: Giridhar
authors.initials: G
authors.lastname: Mishra
authors.forename: P K
authors.initials: PK
authors.lastname: Yadawa
authors.forename: S K
authors.initials: SK
authors.lastname: Kor
authors.forename: A K
authors.initials: AK
authors.lastname: Gupta
authors.forename: Baldev
authors.initials: B
authors.lastname: Raj
authors.forename: T
authors.initials: T
authors.lastname: Jayakumar