Studies on nano suspensions of silver sol and redispersed nanocrystallite silver in aqueous and alcoholic media

► Dispersion of silver nanoparticles by sonication. ► Investigation of nature of interaction of nanosize particles in suspension by ultrasonic velocity measurements. ► Comparison of theoretical predictions of ultrasonic velocity in nano silver suspensions with experimental velocities. ► Effect of particle size on ultrasonic velocity in nano suspensions. ► Effect of medium on ultrasonic velocity.