Particle size distribution analysis of oil-in-water emulsions using static and dynamic ultrasound scattering techniques.

• Size distribution of fluorinert/water emulsion was investigated. • Static/dynamic ultrasound scattering techniques were employed. • Characterization of concentrated emulsion up to 40 vol% was achieved. Dynamic ultrasound scattering allows us to investigate the particle motion and its average size via the time-evolution analysis of the scattering amplitude in optically turbid media. Recently, we proposed a novel particle sizing method that simultaneously analyzes the depth dependences on the sedimentation velocity and the scattered intensity without prior knowledge about the shape of the size distribution (Ultrasonics , 65 (2016) 59–68). In this study, the applicability of the technique to Fluorinert/water dilute and concentrated emulsions (up to 40 vol%) was examined. For the bimodal distribution of the emulsion, the size distribution of the particles was successfully obtained by directly probing the particle motion with different sizes as a function of the sample depth. The validity of the analysis was also investigated by comparing with conventional ultrasonic spectroscopy. [ABSTRACT FROM AUTHOR]