Implementation and comparison of dynamic and static light scattering techniques for polidisperse particle sizing using a CCD camera

Abstract

Abstract. Laser techniques for particle sizing are used in industrial as well as in scientific applications due to the direct connection between the measured quantities in light dispersion processes and particle properties. We have successfully implemented two light scattering techniques, adapted to function with a CCD camera as detector: the dynamic technique, studies the temporal correlation of the scattered light in a fixed direction (known as DLS for "Dynamic Light Scattering"); the static technique, retrieves the mean intensity distribution as a function of the scattering direction. We present experimental results on monodisperse and polidisperse solutions of latex spheres diffusing in water and compare the performance of these techniques. The statistical averaging over the CCD pixels allows significant reduction of measurement times.

Methods to Evaluate Uptake of Engineered Nanomaterials by the Alimentary Tract

“…The particle size determined from MALS, properly called a radius of gyration, is often similar to that measured by DLS (Kato and others ). The primary advantage of MALS is that it is faster than DLS and can be slightly more sensitive (Alvarez and others ). As such, it is most often encountered in combination with a chromatographic separation technique such as asymmetric field flow fractionation (aFFF), which allows one to separate a sample of ENMs by size and measure in real time from the size of each fraction before directly aspirating into an ICP‐MS for elemental analysis, as a study by Schmidt and others () related to detection of clays migrated from food contact materials.…”