An Empirical Correction for Moderate Multiple Scattering in Super-Heterodyne Light Scattering

Abstract

Frequency domain super-heterodyne laser light scattering is utilized in a low angle integral measurement configuration to determine flow and diffusion in charged sphere suspensions showing moderate to strong multiple scattering. We introduce an empirical correction to subtract the multiple scattering background and isolate the singly scattered light. We demonstrate the excellent feasibility of this simple approach for turbid suspensions of transmittance T>0.4. We study the particle concentration dependence of the electro-kinetic mobility in low salt aqueous suspension over an extended concentration regime and observe a maximum at intermediate concentrations. We further use our scheme for measurements of the self-diffusion coefficients in the fluid samples in the absence or presence of shear, as well as in polycrystalline samples during crystallization and coarsening. We discuss the scope and limits of our approach as well as possible future applications.

Submitted to JCP as regular article, 35 pages, 13 figures and supplementary material, 15 pages, 12 figures

References in corpus (2)

• Particle sizing by dynamic light scattering: non-linear cumulant analysis
• Grain refinement and partitioning of impurities in the grain boundaries of a colloidal polycrystal

Cited by in corpus (4)

• Charging of dielectric surfaces in contact with aqueous electrolyte -- the influence of CO${}_2$
• Non-Monotonic Concentration Dependence of the Electro-Phoretic Mobility of Charged Spheres in Realistic Salt Free Suspensions
• Nonequilibrium dynamical structure of a dilute suspension of active particles in a viscoelastic fluid
• Formation of a transient amorphous solid in low density aqueous charged sphere suspensions