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 20 of 22 for “"ionic interaction"”.
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Synthesis and application of ionic molecular and polymeric materials
… built from atoms and molecules through different interactions. Few artificial material is built primarily with ionic interaction despite its ubiquitous existence in living systems. My research has focused on filling this void by developing novel ionic molecular and polymeric materials for both …
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Novel Insights into CB1 Receptor Signaling and the Anabolic Role of Cannabinoid Receptors in Bone
… Studies in class A GPCRs have suggested an ionic interaction between residues of TMHII and VII. In this report, modeling studies identified residue K373, in the extracellular (EC)-3 loop, in charged interactions with D2.63. We investigated this possibility by performing reciprocal mutations …
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Designing Acrylic Block Copolymers with Multiple Hydrogen Bonding or Multiple Ionic Bonding
The dynamic characteristics of hydrogen and ionic bonding contributes to the reversible properties of acrylic polymers, opening new avenues for designing materials with mechanical strength and processability. These non-covalent interactions function as physical crosslinks, which provide enhanced …
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A Study of the Effects of Polyethylene Glycol on Interactions Between Glycolytic Enzymes and F-Actin, and Among Glycolytic Enzymes
<p>Many studies of the protein interactions that compose the microtrabecular lattice have been done in dilute solutions. However, solutions containing inert polymers such as polyethylene glycol (PEG) more effectively mimic the crowded interior of the cell. Therefore, the interactions of …
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The Effect of PEG-Insulin and Insulin Hexamer Assembly on Stability in Solution and Dry Powders. Hexamer Assembly of PEGylated-Insulin and Insulin Studied by Multi-Angle Light Scattering to Rationally Choose the pH and Zinc Content for Analytical Methods and Formulations of Dry Powders.
… especially when the zinc ion is removed. Ionic interaction is one of the major forces affecting insulin assembly. The theory that a change in the charge state of insulin could modulate the ionic interaction and reduce hexamer formation at alkaline conditions was investigated. Experiments …
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Examination of intramolecular interactions between residues of the cys-loop GABA receptor Hco-UNC-49 from Haemonchus contortus
… this thesis was to characterize intramolecular interactions of Hco-UNC-49B. Two sets of oppositely charged residues were chosen based on their proximity to each other in a model of Hco-UNC-49 generated using the C. elegans GluCl crystal structure as a template. These residues are predicted to …
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Structural and Mutational Analyses of Aspergillus fumigatus SidA: A Flavin-Dependent N-hydroxylating Enzyme
… In particular, we have chosen to study the interactions of Arg 279, shown to interact with the 2'phosphate of the adenine moiety of NADP+ as well as the adenine ring itself. The mutation of this residue to alanine makes the enzyme have little to no selectivity between coenzymes NADPH and …
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An ab Initio Investigation of van der Waals-Rich Systems and a Machine Learning Approach to Finding Analytical Functions Describing Tabulated Data
van der Waals interactions are weak, non-specific forces arising at the atomic scale. Although they are weak---much weaker than a covalent or ionic interaction---they occur in large numbers, and in total, can make a significant contribution to the properties of a system. Several systems are herein …
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Colloidal microgels: synthesis, characterisation and applications
… and temperature play an important role in the ionic interaction between oppositely charged microgel and PS latex particles. Some particulate dispersions have shown temperature-dependent reversible flocculation behaviour, which could be applicable in the water industry for the removal of …
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Phase behavior of dipolar fluids and ion-dipole mixtures, and surface diffusion of adsorbed polymers
… (DHS) is the simplest model described by dipolar interactions, studying this model is fundamentally important for understanding the structures and thermodynamics of polar fluids. A variety of unsolved scientific questions arises when the dimensionality of this model is changed and when other …
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Surface analysis of sodium oleate coated poly (ethylene terephthalate) films
… the mechanism for this phenomenon includes the ionic interaction between the sodium of sodium oleate and the surface oxygen groups, as well as, the increased crystallinity of the PET brought about by the annealing process. Corona discharge processing of polymer films such as PET or polyethylene …
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Smart organic-inorganic nanohybrids of functionalized silsesquioxane nanoparticles
… all cases the mixing of aqueous solutions of anionic block copolymer micelles or the anionic stars with solutions of the silsesquioxane nanoparticles led to the easy and straightforward formation of organic-inorganic nanohybrids. The structure of the complex nanohybrids depends on pH and …
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Synthesis, characterization and assembly of the binary ligand protected gold nanoparticles
… The network structure is formed only using ionic interaction between NPs, and it requires both divalent anionic nanoparticles and divalent cations. Gels are investigated to determine their properties using rheological characterization.
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Irreversibilities and nonidealities in desalination systems
… approximation, Debye-Hückel theory, Pitzer's ionic interaction model, and Pitzer-Kim's model for mixed electrolytes. Error introduced by using incorrect property models is quantified. Least work is a strong function of ionic composition; therefore, standard property databases should not be …
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Contribution of specific amino acids to calcium-dependent dimerization of epithelial cadherin
… is residue K14, which is proposed to have an interaction with D138 on the partner protomer, an ionic interaction that stabilizes the X-dimer interface. While the wild type protein displays behavior characteristic of a rapidly exchanging monomer-dimer equilibrium, the mutant K14E exhibits slow …
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Development of mechano-active organic materials for shock wave energy dissipation
… that undergo pressure-induced neutral-to-ionic transitions via ultrafast electron transfer reactions. Due to the enhanced ionic interactions, intermolecular volume decreases as electron transfers occur from electron donors to electron acceptors. Both hydrostatic pressure and transient …
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Nanomechanical coupling of mechanomutable polyelectrolytes
… which characterize the strength of electrostatic interactions, topology, and viscoelastic properties of polyelectrolyte multilayers (PEMs), but very little is known about the fundamental molecular interactions that drive system behavior. Here, we focus on two specific weak polyelectrolytes - …
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Process and Material Modifications to Enable New Material for Material Extrusion Additive Manufacturing
… counterions affect FFF processing. The strong ionic interaction within poly(PEG8k-co-CaSIP) resulted in the best print quality due to the higher viscosity (105 Pa∙s) allowing the material to hold shape in the melt and the high-nucleation producing small spherulites mitigating the layer warping. …
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Synthesis and Characterization of Novel Telechelic High Performance Polyester Ionomers
… techniques. Various concentrations of the ionic end group, SSBA, were successfully incorporated in a telechelic fashion. For comparison, polyesters containing telechelic alkyl groups with controllable molecular weights were also synthesized. Furthermore, ionic copolymers of dimethyl …
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Bio-inspired Design and Self-Assembly of Nucleobase- and Ion-Containing Polymers
… monomers functionalized with nucleobase or ionic group allowed synthesis of supramolecular polymers using free radical polymerization and controlled radical polymerization techniques. Comprehensive investigations for the structure-property-morphology relationships of these supramolecular …
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