Characteristics of HOPG Surfaces for the Analysis of Carbonaceous Matter Separation from Sulfide Ores by Flotation, M.F.His research has involved electrochemistry of cementation and leaching reactions, as well as technology for gold recovery from both cyanide and noncyanide leach solutions. In hydrometallurgy, Professor Miller is especially interested in the physical chemistry of leaching, cementation and solvent extraction. Lithium-ion batteries, with a solid electrolyte, are regarded as one of the most promising systems for next-generation batteries. Most recently, Miller’s study of phyllosilicates has branched into research involving the use of phyllosilicates, particularly halloysite nanotubes, for improved lithium ion transport in solid polymer electrolytes (SPE’s) for lithium-ion batteries. In addition, the charge for different surfaces of anisotropic nanoclay particles has been measured to explain and simulate the aggregation of these nanoparticles from suspension. In addition, considerable effort has been devoted during the past decade to surface force measurements by atomic force microscopy (AFM) and the in-situ examination of surface micelle structures by AFM soft contact imaging. Study of spectroscopic characteristics of interfacial water by SFG spectroscopy and molecular dynamics simulation is in progress to understand in more detail the hydrophobic surface state. Surface chemistry research activities to support the development of flotation technology include the study of surfactant adsorption, particularly the characterization of self-assembled monolayers and LB monolayers by in-situ FTIR/IRS and Raman spectroscopy. The development of software tools for the 3D characterization, analysis, and simulation of packed particle beds using high resolution X-ray microtomography (HRXMT) has been applied in areas of importance to mineral processing technology including comminution (particle damage and preferential grain boundary fracture), exposure/liberation analysis (liberation-limited grade/recovery curves and coal washability), and filtration/heap leaching (pore network structure of packed particle beds and simulated flow using the LB method of computational fluid dynamics, including the multiscale structure of flocculated clay sediments and corresponding water content).Ĭontributions to the technology of coal preparation include flotation chemistry for improved rejection of pyrite and ash, procedures for the selective flotation of fossil resin from coal, and most recently the use of X-ray computed tomography both for high speed coal washability analysis. Due to advances in X-ray optics, the resolution afforded with point-projection microtomography systems has been improved by at least an order of magnitude using a lens-based X-ray microtomography system. An important effort in the application of X-ray microtomography to 3D mineral liberation analysis continues with significant progress. Research has focused on fine particle flotation, grinding/liberation analysis, and the flotation chemistry of nonsulfide and fossil energy minerals. Research interests include mineral processing and coal preparation, particularly phenomena involved in flotation separations including surface chemistry, particle/particle interaction and particle/bubble interaction.
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