Suspensions of powders in liquids are involved in many commercial processes and products. Surface forces control the flow and sedimentation characteristics of particles whose diameters are between 0.02-200 microns. The preparation of a dispersion/(cerium slurry) require equipment and chemicals to facilitate the steps of dispersion, for example, wetting the external surface of the particles, breaking up clumps, and preventing reagglomeration.
Glass polishing with cerium oxide is a chemical mechanical process. When the cerium particles move away from the glass surface after the polishing/collision, the uncoated oxide surface from the collision area would adsorb dispersant from solution, where the adsorption equilibrium is affected by the contact process as liquid shear rate, pressure, and temperature in the contact region change significantly during the cerium particle and glass surface collision.
Improved methods for polymer synthesis have led to more effective dispersant; powerful computers have facilitated modeling details of interactions between particle, dispersants, and the liquid; and highly sophisticated instruments are available to measure particle-particle and particle-dispersant interactions. We have been studying the three stages of dispersing a powder in a liquid: wetting the powder into the liquid, deagglomerating the wetted clumps, and preventing reagglomeration. As well as the modification of surface and use of additives (dispersants) to prevent reagglomeration.
Years of research and development work have allowed us to develop cerium oxide products with superior performance and functionality with respect to suspension and dispersion, slurry re-circulation and re-dispersion, glass removal rate, polishing cycle time, longevity, and surface finish.
All of our polishing products are engineered for high material removal rate and exceptional cleanability, while producing low to sub-angstrom surface finishes.
Research and Development in Particle Science
Glass removal rate tests conducted jointly with Zeiss.
Glass surface roughness tests conducted by a customer
Tyflong International Inc.
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