Multiple-scattering suppression in dilute and concentrated colloidal dispersions |
| |
Authors: | P N Segrè P N Pusey |
| |
Institution: | (1) Department of Physics and Astronomy, The University of Edinburgh, Mayfield Road, EH9 3JZ Edinburgh, UK |
| |
Abstract: | Summary We describe the design and operation of an improved two-colour dynamic light scattering (TCDLS) equipment which effectively
suppresses multiple scattering and allows the study of the Brownian dynamics of optically turbid samples. The technique operates
by cross correlating scattered light of two different colours. With the appropriate scattering geometry, only singly scattered
light contributes to the time-dependent part of the measured intensity cross-correlation function thus allowing straightforward
interpretation of the data. To test the performance of the instrument we have studied several dilute colloidal suspensions,
which, although dilute enough that free diffusion of the particles can be assumed, ranged from quite transparent to distinctly
turbid. We have confirmed that the measured cross-correlation functions accurately reflect only single scattering even in
the presence of strong multiple scattering. As a first application of the technique, we have performed light scattering measurements
on concentrated suspensions of PMMA particles in cis-decalin.
Paper presented at the I International Conference on Scaling Concepts and Complex Fluids, Copanello, Italy, July 4–8, 1994. |
| |
Keywords: | Viscosity and diffusion: experimental |
本文献已被 SpringerLink 等数据库收录! |
|