Spectroscopy of Light Scattered by Suspended Charged Particles

Abstract

Two spectroscopic techniques of the Rayleigh scattered light have been investigated. One investigation is on a method to measure the Rayleigh linewidth precisely. From the measurements it is found that the linewidth of the scattered light by the polystyrene latex particles in the buffer solution is significantly different from that obtained from the Einstein-Stokes relation. The other investigation is on an application of the spectroscopic method for the detection of the electrophoretic analysis. From the investigation it is found that the Rayleigh scattered spectral line shows the Doppler shift by the electrophoretic movement of the particle and that the electrophoretic velocity can be measured in real time.

Paraserianthes Falcaria Activated Carbon for the Absorption of Heavy Metal Fe+3 in Simulated Waste Water

“…The dispersed particles are charged, so that there will be electrical double layer around the particles that prevents the particles from aggregation [17]- [19]. Various techniques may be used to determine the surface charge of the colloidal particle [20]- [22] and the applications of these techniques have been published [23]- [25]. A minimum volume of 600ml sample is needed for each concentration.…”

Dynamic Light Scattering in a Periodically Stationary System

“…Quasi-elastic light scattering in an external dc electric field (QELS-DEF) is a powerful tool for characterization of synthetic and biological polyelectrolytes including DNA and proteins in aqueous solutions. − This is mainly because QELS-DEF can give us the electrophoretic mobility and diffusion constant of polyions simultaneously. The diffusion constant is inversely proportional to the friction constant of the polyion and closely related to the size and conformation of the polyion.…”