Impact of Ultrasound on the Motion of Compact Particles and Acousto-responsive Microgels

• DOI: 10.48550/arxiv.2307.12696
• Publication Date: 2023-01-01
• Authors: Sebastian Stock; Regine von Klitzing; Amin Rahimzadeh
• Keywords: Particle (ecology); Intensity

In this study, we investigate dynamic light scattering (DLS) from both randomly diffusing silica particles and acousto-responsive microgels in aqueous dispersions under ultrasonic vibration. Employing high-frequency ultrasound (US) with low amplitude ensures that the polymers remain intact without damage. We derive theoretical expressions for homodyne autocorrelation function, incorporating US term alongside diffusion term. Subsequently, successfully combine a conventional DLS system to experimentally characterize compact influence of US. Our model allows us extract essential parameters, including particle size, frequency, vibration, based on correlation function scattered intensity. The studies involving non-responsive demonstrate does not disrupt size determination, establishing them as suitable reference systems. Microgels show same swelling/shrinking behavior induced by temperature, but significantly faster kinetics. findings study have potential applications various industrial biomedical fields benefit characterization macromolecules subjected