Numéro
J. Phys. IV France
Volume 03, Numéro C1, Mai 1993
COMPLEX LIQUID SYSTEMS
Page(s) C1-39 - C1-46
DOI http://dx.doi.org/10.1051/jp4:1993104
COMPLEX LIQUID SYSTEMS

J. Phys. IV France 03 (1993) C1-39-C1-46

DOI: 10.1051/jp4:1993104

Spinodal dynamics in cluster aggregation

M. CARPINETI and M. GIGLIO

Dipartimento di Fisica, Università di Milano, via Celoria 16, 20133 Milano, Italy


Abstract
We report small angle static light scattering measurements on colloidal aggregation at high monomer volume fractions. The structure factor S(q) exhibits a pronounced maximum at a finite wave vector qm at any stage during the aggregation reaction. In the later stages the structure factor scales accordng to a universal law similar to that of spinodal decomposition dynamics : [MATH]. At variance with spinodal decomposition, where d = 3, we find d = df, the fractal dimension of colloidal clusters. The aggregation stops when the peak position reaches a certain value q* which depends on the monomer concentration. The terminal stage occurs when all the sample is filled with close packing fractal clusters of size R α 1/q*



© EDP Sciences 1993