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Showing 1 to 11 of 11 for “"Acid-Base Interaction"”.
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Investigation of acid/base interactions in adhesion
The fundamental study of Lewis acid/base interactions presented in this dissertation demonstrates the role of these interactions in adhesive phenomena. The model systems investigated were representative of real substrates and soft, viscoelastic adhesives where, in one case, favorable acid/base …
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Reactivity studies of phosphoric amides and esters
The effect of protonation and Lewis acid-base interaction on the ¹H n.m.r. chemical shifts of the ester and amide bonds in selected phosphoramidates (RO)₂P(O)NR'₂ was investigated. The results are interpreted in terms of the interaction of the phosphoryl oxygen atom with Lewis acids and …
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Manipulation of Carbon Nanostructures for Multifunctional Composite Materials
… SWCNT fibers were impregnated with polyamic acid (PAA) solution at 100 psi followed by thermal imidization to obtain fibers reinforced with polyimide (PI). The tensile strength was increased form 68 to 215 MPa for SWCNT fibers after VPI and imidization. Surfactant-wrapped chemically converted …
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Development and Evaluation of Ternary Amorphous Solid Dispersion of Poorly Water-soluble Compounds
… crystallization tendency, Flory-Huggins interaction parameter, solubility parameter, as well as advanced studies (i.e., crystallization kinetics and molecular interaction). Upon selection of the optimum polymer, TASDs were prepared by rotary evaporation. Pure drugs, their physical …
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Interactions of biomass derived oxygenates with heterogeneous catalysts in aqueous and vacuum environments
… of various surface sites on polyol-metal oxide interactions, and to discover the surface species of kinetic importance in aqueous phase reforming reactions of biomass molecules. Transmission infrared spectroscopy and density functional theory modeling were the major techniques used to …
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Development of Conjugated Boronate Ester-Linked Materials For Optical Sensing Applications Targeting Small Molecules
… esters to serve as optical sensors towards Lewis base substrates, because the Lewis acid-base interaction causes the change in hybridization of boron, thus interrupting effective conjugation. In chapter 3, thiophene containing conjugated boronate esters were used to study the factors affecting the …
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Stabilization of Submicron Metal Oxide Particles in Aqueous Media
… to PVOH were observed to adsorb only on the most acidic metal oxide, SiO₂. PVOH, however, was observed to adsorb on all three metal oxides, but to a lesser degree on SiO2 as compared to the more basic PEOX and PEO. These initial results were indicative of hydrogen-bonding mechanisms, a form of …
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Investigations on the Behaviour and Properties of Different Types of Unilamellar Vesicles
… state with higher TTB concentration. Catanionic interaction between two oppositely charged parent-surfactants oleic acid and decyltrimethyl ammonium hydroxide (C10TAOH) is like an acid-base interaction. Phase behaviour of their interaction revealed that a narrow region with equimolar mixing …
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Design, Synthesis and Evaluation of Liquid-like Nanoparticle Organic Hybrid Materials for Carbon Dioxide Capture
… is critical for the future of carbon-based energy. Currently, the most commonly employed approach to capture CO2 is amine scrubbing in which amine-based solvents react with gaseous CO2 to form carbamate. Although the amine-based solvents such as monoethanolamine (MEA) exhibit high CO2 …
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Advanced Chemical-Mechanical Dewatering of Fine Particles
… to achieve lower cake moistures. It was based on using a lower vacuum pressure during the cake formation time, while a full vacuum pressure was used during the drying cycle time. Thus, use of the dual vacuum system allowed the disc filter to be used in conjunction with the novel …
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Investigating electrolyte-reagent-mineral interactions in response to water quality challenges in the flotation of a PGM ore
… performance through electrolyte-reagent-mineral interactions. This study has investigated whether there are any dominant or synergistic electrolyte-reagent interactions occurring during flotation which may impact negatively on the flotation performance. Interactions occurring in both the pulp …