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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 92 for “"ball milling"”.
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Ball milling process
Thesis: B.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1963
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Investigating carbocations using high speed ball milling
… reactions can occur under high speed ball milling conditions; the results were that primary alkyl halides undergo substitution reactions, while the reactions of secondary alkyl halides depend on the nucleophile. However, reactions that form a carbocation intermediate, such as, …
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Nanostructured Copper-Silver Alloys Synthesized by High Energy Ball Milling
… the range of 4--6 Gpa. The hardness increases as milling temperature increase, as a result of phase separation and dynamic recrystallization.
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Investigation of operating conditions in stirred ball milling of coal
… finely disseminated mineral matter. The stirred ball mill is regarded as one of the most efficient devices for micronizing coal. Using a five-inch batch mill, the optimum operating conditions have been determined in terms of media size, feed size, media type, stirring speed and percent solids. …
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Bismuth-Ceramic Nanocomposites Through Ball Milling and Liquid Crystal Synthetic Methods
An additional synthetic method based on the infusion of ammonia gas to drive pH driven chemistries was also demonstrated for the synthesis of BiOCl and Bi nanoparticles.
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Discrete element method based scale-up model for material synthesis using ball milling
Mechanical milling is a widely used technique for powder processing in various areas. In this work, a scale-up model for describing this ball milling process is developed. The thesis is a combination of experimental and modeling efforts. Initially, Discrete Element Model (DEM) is used to describe …
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Sintering behavior of Ag-Sn alloys prepared via cryogenic high-energy ball milling
… Ag-Sn alloys, prepared via cryogenic high-energy ball milling, as well as their sinterability. Multiple Sn compositions were studied ranging from 6-15at%Sn. Cryomilling is shown to extend the solid solubility of Sn in Ag from 8 to 15.4at% at room temperature, as well as produce anomalous Bragg …
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Development and mechanistic understanding of ball milling as a sustainable alternative to traditional synthesis
… of sustainable synthesis that utilizes ball milling. Ball milling, unlike traditional synthetic methods, uses mechanical energy to drive organic reactions and transformations towards completion. Not only are we interested in finding reaction pathways that produce desired organic products …
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Hardness variation and cyclic crystalline-amorphous phase transformation in CuZr alloy during ball milling
… cycles of a cyclic phase transformation during ball milling. Each are found to cycle with a period of approximately 320 minutes. Although significant chemical contamination was found in the milled specimens, the results shed some light on mechanical alloying theory and favor interpreting …
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Development of nanocrystalline Fe80Cr20 alloy using combination technique of ball milling and ultrasonic treatment for fuel cell interconnector
… of this study is to explore the high energy ball milling (milled) combined with ultrasonic treatment (UT) in obtaining smaller crystallite size, finer surface morphology, higher thermal stability and more homogenous nanocrystalline Fe80Cr20 alloys. This condition was motivated by the previous …
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Development of High Entropy Alloys for High Temperature Applications
High Entropy Alloys, Spark Plasma Sintering, Ball milling, AlCoCrFeNI HEA, CO- Free HEA, Oxidation, Corrosion
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In-situ Synthesis of Piezoelectric-Reinforced Metal Matrix Composites
… using reaction synthesis and high energy ball milling. Zinc oxide (ZnO) and barium titanate (BaTiO₃) have been successfully synthesized within copper and iron matrices in a range of volume percentages using reaction synthesis. The microstructures of these composites have been analyzed and …
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Cryomilling of Aluminum-based and Magnesium-based Metal Powders
Ball milling has been shown to produce nanostructures in metal powders through severe repetitive deformation. Ball milling at cryogenic temperatures (cryomilling) is more effective in this capacity due to the low temperature by slowing recovery and minimizing diffusion distances between different …
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Novel Synthesis of Bulk Nanocarbon (BNC)
… (BNC) material was synthesized using high energy ball milling and the carbonization of corn cob. Corn cob was mechanically milled for up to 20 hours by applying high energy ball milling to produce the milled powder. The milled powder was cold-compacted and carbonized at up to 1500°C to fabricate …
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Amorphous Ni-based Alloys as Alkaline Oxygen Evolution Electrocatalysts
… into membrane systems. In this work, a two-stage ball milling process was developed and implemented to synthesize high surface area amorphous Ni-based nanoparticles. This process allowed for a broad range of novel compositions to be explored and not be limited to deep eutectic compositions, as …
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Chemical Compositions of Edamame Beans and Valorization of Edamame Shells
… the properties of edamame shell-derived DF. Ball milling is one of the most efficient techniques to break down biomaterials into sub-micro-level particles. Citric acid, as a natural and safe food additive, can help break down cell walls and improve the dissolution of SDF by ionizing the …
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ZSM-5/thermoplastic polyurethane mixed matrix membranes for pervaporation of dilute aqueous organic solvents
… selectivity and permeability of the MMMs. Ball milling and air calcination were also conducted on the ZSM-5 particles to ideally further improve their separation capabilities. The resulting membranes were characterized by SEM, AFM, EDXA, TGA, and contact angle analysis. Experimental results …
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Sustainable Mechanochemical Synthesis and Manufacturing of Metal-Organic Frameworks for Enhanced Hydrogen Storage
… that high-quality CuBTC can be produced by ball milling, challenging the widely held assumption that mechanochemical synthesis inevitably leads to defect-rich frameworks. This solvent-free design approach reduces the CuBTC synthesis time to a few minutes while consuming less than 2% of the …
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Consolidation of WC-Co nanocomposites synthesised by mechanical alloying
The influence of mechanical alloying (MA) milling time, temperature, sintering method and microstructure on the mechanical properties of a tungsten carbide-cobalt (WC-Co) hardmetal, based on 10wt% Co, has been established. The effects of high-energy milling for 30, 60, 180 and 300 min and the …
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