Global ETD Search
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 12 of 12 for “"redispersion"”.
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The redispersion of supported metal catalysts
Call number: LD2668 .T4 1978 H347
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Liquid-Liquid Extraction in Agitated Contactors Involving Droplet Coalescence and Redispersion
… the high energy contactors a droplet coalescence-redispersion mechanism predominates, The literature pertaining to these extractors has been examined and the important phenomena such as droplet break-up and coalescence, phase inversion, mass transfer and backmixing have been reviewed, The …
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The Effects of Temperature and Reactive Environments on Metal Particle Sintering and Redispersion
… key observation was a measured increase in the redispersion of the catalyst that had been sintered after exposures with Hfac at an elevated temperature. A similar process has never been observed previously. These results suggest the possible future use of Hfac or similar diketones to control …
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The Surface Reaction Mechanisms of Beta-Diketones on Transition Metal Surfaces Including Applications to Metal Thermal Chemical Vapor Etching and Heterogeneous Catalyst Particle Redispersion
… to alter Pd particle dispersion. Low-temperature redispersion of a sintered 5% Pd/gamma-alumina catalyst was most successful via exposure to oxygen and acetylacetone at ∼560 K for 8 hours. A bimodal distribution of CO desorption states was achieved, at 405 K and 585 K, with more CO desorbing …
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Thermoresponsive colloidal stability of core-shell nanoparticles with self-assembled ionic surfactant shells
… for complete precipitation and for beginning redispersion, can be fitted accurately by using a simple model based on an H-type adsorption and including the specific surface area of the particle and molar area of the surfactant. In order to assess influence of the surfactant chain length on the …
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Production of stable bcs class ii drug suspensions by melt emulsification and subsequent incorporation into polymer strip films
… by oven drying. The film is characterized by redispersion and by dissolution rate. Particles are recovered from the films in de-ionized water within 5 minutes with no size increase, and a marked increase in dissolution rate is observed in comparison to as-received particles. The feasibility of …
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Preparation of CO2-Switchable Poly(Methyl Methacrylate) Latexes by Surfactant-Free Emulsion Polymerization
… followed by simple CO2 purging for redispersion. Full recovery of particle size and distribution, solids content and latex stability was achieved within 5 min of applying the triggers. The second switching cycle was carried out by alternating N2/CO2 purging. Sonication was not needed …
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A study of adsorptive bubble separation methods for removal of metal ions from aqueous solution
… flotation was complete within two minutes and redispersion tended to occur with extended flotation times. The flotation process produced-good removal of copper (It) ions (395%) from solutions with pH >6.0. Liquid-liquid extraction studies were carried out using the dioxime dissolved in …
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Anti-solvent precipitation and subsequent film formation of hydrophobic drugs for drug delivery
… marked improvements. Most importantly, the redispersion of the drug-loaded films in an aqueous matrix showed that the crystallinity remained unaltered, and there was no appreciable increase in the particle size distribution.
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Assessment of nanocomposites vs. amorphous solid dispersions for dissolution enhancement of bcs class ii drugs
… on drug release rate and mechanisms during the redispersion-dissolution of nanocomposites prepared via dying of the drug nanosuspensions, and (3) assess the dissolution enhancement imparted by drug nanocomposites vs. ASDs prepared via drying of drug nanosuspensions by a novel nanoextrusion …
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Heterogeneous catalytic conversion of biomass to added-value biofuels and chemicals
… of catalysts as well as for the in situ redispersion of deactivated/sintered catalyst in a hydrogenolysis reaction. Hence, this thesis reports the conversion of lignocellulosic biomass to added-value biofuels and chemicals using primarily platinum group and related metal catalysts on a …
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Programmable, isothermal disassembly of DNA-linked colloidal particles
Colloidal particles serve as useful building blocks for materials applications ranging from controlled band-gap materials to rationally designed drug delivery systems. Thus, developing approaches to direct the assembly and disassembly of sub-micron sized particles will be paramount to further …