In this study, we characterize dispersion flow properties as a function of ionic strength and polyurethane weight fraction. In this investigation we examine the flow properties of weakly flocculated suspensions. The mechanical properties of the gelled samples are of importance in determining porosity and suspension processibility. We are currently seeking general descriptions of yielding and flow in terms of the depth of the interparticle attractive potential. The mechanisms of formation of silver sols produced by the sodium borohydride reduction of silver perchlorate are explored.
Factors controlling aggregation include ionic strength and borohydride concentration.
Detailed kinetic experiments are used to develop a predictive growth model. Our recent measurements of surface diffusion on Si have demonstrated that both photon illumination and low-energy ion bombardment can significantly alter surface diffusion on Group IV semiconductors. Neither effect has ever been observed directly before. Photon-induced modifications seem to be mediated electronically, as substrate doping affects the results. Ion-induced modifications clearly involve some sort of momentum transfer.