Use of fiber optics quasi-elastic light scattering (FOQELS) in the particle sizing of polymer latices

Dynamic light scattering (DLS) technique is used for characterizing the mol ecular changes in the physiological, chemical, polymer and colloidal system s, Since the first experimental use of the optical fiber in 1975, it has be en increasingly important tool in the light scattering instrumentation, The re had been a great amount of modification and development of this instrume ntation during last couple of decades by so many researchers. Here we repor t the DLS study of polymer latices of different particle size and different concentration using various cells. The study shows that the quartz cell sh ows better efficiency than the acrylic cell for the latices of lower concen tration. Analysis by FOQELS for concentrated solution of the latex of small er particle size shows no deviation, Analysis of the latex of relatively la rger particles shows negative deviation.