Study On Microstructures Of Metallic Superfined Particles Under External Force

In this thesis Brownian Dynamics is used to study on microstructures and properties of the solution contained superfined metallic particles(ions and non-ions) under shear rates, to search for the influence of shear stresses on microstructures in non-polar solution, uni-polar solution, and bi-polar solution systems, as well as to search for the reasons why change of properties of physical chemistry in the three systems from the microstructure changes, thereby to lay a fundation for industrializing applications on a large scale. This research is importantly significant of guidance to the systems of superfined particles such as preparation of nanometer materials, and to the aqueous systems of many particles such as hydrometallurgy and processes of extraction in chemical engineering.Research on microstructures of partly charged particles at different shear rates in uni-polar and bi-polar systems under the conditions of partly charge have been performed, the microstructures mainly include radial distributions, average energies and cluster sizes as well as cluster size distribution of the metallic particles, and the properties are compared with those in both non-polar system and experiments. The results indicate that scatteribility is the best and is the most unfavorable to grow up or to deposit for the metallic particles in uni-polar systems with high ion concentrations; the average potential energies in uni-polar and non-polar systems increase monotonously with increasing shear stresses,but response of the average energies to shear rates is non-linear in bi-polar systems. Besides, a "double peaks" that is rarely seen in other systems has been found exiting in the first shell of radial distribution at high shear rates in the bi-polar system, of which, "the right peak" located as same...