Original scientific paper

Light Scattering from Polydispersed Fractal Clusters in Solution

Sow Hsin Chen ; Department of Nuclear Engineering and Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Mass. 02139, U.S.A.
Jacques Rouch ; Physics Department, C.P.M.O.H., University Bordeaux I, 351 Cours de la Liberation 33405 Talence Cedex France
Pierro Tartaglia ; Dipartimento di Fisica, Università di Roma, »La Sapienza«, Piazzale Aldo Moro 2, 1-00185 Roma, Italy

Abstract

A brief review is given of our recent theoretical and experimental work on static and dynamic light scattering from aggregating polystyrene lattices in solutions and percolating dense microemulsions. The former is characterized by formation and growth of reaction limited fractal aggregates induced by addition of salt, and is basically a nonequilibrium phenomenon. The latter, however, is characterized by formation and growth of clusters of dynamically percolated microemulsion droplets, as one approaches the percolation threshold from below, and is an equilibrium phenomenon. Theories of static and dynamic light scattering from these polydispersed fractal clusters are formulated, emphasizing calculations of the universal scaling functions measurable in the experiment Experimental data are then analyzed to substantiate the theoretical predictions. The similarity of the latter case with the well-known results from the equilibrium critical phenomena is pointed out.

Keywords

Hrčak ID:

137179

URI

https://hrcak.srce.hr/137179

Publication date:

15.8.1992.

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