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Particle Size Analysis and the Use of Particulates in Advanced Materials Processing Professor Don H. Rasmussen has published extensively in the areas of nucleation and growth of new phases and on techniques to study nucleation and particle growth processes. His research is focused on (1) the study of phase stability in ternary systems using DIT (diffusive interface transport) techniques; (2) characterizing concentrated colloidal systems using fiber optic dynamic light scattering; (3) metal particle nucleation and growth in non-aqueous media; (4) nano-scale ceramic particle nucleation and growth, and in the deposition of thin ceramic films; (5) homogeneous nucleation in aerosols; and finally, the influence of surface properties of polymers and colloidal particles on the chemical-mechanical polishing of metal and nonmetal films. His ongoing experimental projects include: (1) measurement of the dynamic scattered light power spectrum from concentrated colloidal systems using a bifurcated single mode fiber optic probe (being developed to study particle breakdown, aggregation or growth in concentrated systems; the probe reduces the influence of multiple scattered light), (2) determination of the particle size from the shape of the power spectrum and the particle concentration from the integrated power spectral density, (3) nucleation and growth of particles in supersaturated systems (both aerosols in vapors and particles in supersaturated liquors), and (4) the characterization of the hardness and surface properties of CMP polishing pads by surface energy determination and measurement of hardness using nano-indentation resistance. The establishment of a laboratory for the determination of phase equilibrium in ternary surfactant systems is currently a high priority. Granular Flows and Materials CAMP Professor Hayley Shen, of Clarkson University's Department of Civil and Environmental Engineering, is investigating granular flows in terms of constitutive relations, flow rate effects, particle size and shape effects. She is also interested in two-phase flows. Professor Shen is currently funded by a NASA Microgravity Fluid Physics Program to study the behavior of granular flows in different gravitational fields. This project is being conducted in collaboration with researchers from the University of Florida and Cornell University. Professor Shen is also applying the new knowledge on dry granular materials to improve the design of soil handling machinery. She is collaborating with Professor Janoyan on a project supported by John Deere. They combine laboratory tests andmathematical modeling to simulate soil/structure interactions TOP
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