Session EC17 - Scattering From Particles and Surfaces.
ORAL session, Monday morning, March 22
Room 263W, GWCC
Studying light scattered by colloids has applications in both space research and industry. One application is to use the measured diffusion coefficient for determining particle size. Ideally, a reliable light scattering device is capable of measuring a wide range of particle sizes over a wide range of concentrations. However, when measuring light scattered from concentrated systems, multiple scattering and low signal-to-noise ratios have, until recently, made particle sizing a challenging task. While several approaches have attempted to address this problem, ours provides simplicity, robustness, ease of use, and gives the correct results over both a large range of concentrations and correlator delay times. The work we present will show results obtained by extending a single wavelength cross-correlation technique developed in our laboratory. This paper will also discuss the techniques we have developed for particle sizing with both dilute and concentrated solutions.