Aggregation and Gelation in Colloidal Suspensions: Time-Resolved Light and Neutron Scattering Experiments

摘要

We present a time-resolved study of the aggregation and sol-gel transition in concentrated colloidal suspensions. We use diffusing wave spectroscopy (DWS) to obtain quantitative information about the microscopic dynamics all the way from an aggregating suspension to the final gel, thereby covering the whole sol-gel transition. In order to obtain additional information on the corresponding structural changes we have designed a combined SANS-DWS experiment. This allows us to simultaneously measure both the time evolution of the local dynamics as well as the microstructure as the aggregation and gelation proceeds.