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 659 for “"steric"”.
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The steric courses of chemical reactions.
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemistry, 1973
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Particle Transport in Confinement: Nonlinearity, Compressibility, and Steric Effects
… of water. Lastly, we also investigate how steric effects play a role in particle transport near a solid boundary. We show that externally driven active colloids can trap and transport passive particles by steric interactions with a wall, which irreversibly changes the trajectories of …
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Steric and kinetic measurements at well-defined surface sites
… is directly bound to carbon, its length and steric profile can be modulated without affecting the surface packing density. This enables isolation of ligand steric profile as a single contributing factor in the overall steric inhibition of the nanocatalyst. When the ligand of interest is bound …
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Steric and electrosteric stabilization of colloids in aqueous salt solutions
Steric stabilization of colloidal particles occurs through the presence of a layer of adsorbed polymer, and can be important in a number of activities such as paint formulation, treatment of waste water, and drug delivery. Conventional wisdom dictates that the polymer must be attached well, have …
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Modeling steric effects in antibody aggregation using rule-based methods
… models provide information about the average steric hindrance between binding regions and the probability that IgE-FcεRI receptor complexes will bind to these regions. In ad- dition, the optimized rule-based models provide a means of quantifying the variation in aggregate size distribution …
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Steric aspects of the interaction of metal species with nucleic acid constituents
The delineation of steric effects in the interaction of metal species with biomolecules has been addressed. More specifically, a focus has been placed on the interaction of platinum complexes with nucleoconstituents. Steric effects thus characterised have been related to the biological properties …
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Steric Effects of Alkyl Ammonium Salts on the Combustion of Exchanged Smectite Clays
<p>Bomb calorimetry was explored as a new method for determining the cation exchange capacity (CEC) of clays. Smectite clays were modified with several alkyl ammonium salts varying in number of carbons and the spatial orientation of the carbons about the central nitrogen atom. The clays used, …
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Steric and Electronic Effects Induced by Ancillary Ligand Substitutions on Cyclopentadienyl Osmium Complexes
… [(C5Me5)Os(dmpm)H2+] showed that C5Me5 is more sterically demanding than C 5H5, as evidenced by the 7--8° decrease in the dihedral angle between the P-Os-P and C5 ring planes for the C5H 5 analogue, suggesting that movement of the phosphine toward the less sterically bulky C5 ring may lead …
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Three-dimensional kinetic simulations of active suspensions: effect of chemotaxis and steric interaction
In this work, the effects of chemotaxis and steric interactions in active suspensions are analyzed by extending the kinetic model proposed by Saintillan and Shelley [1, 2]. In this model, a conservation equation for the active particle configuration is coupled to the Stokes equation for the flow …
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In-situ steric stabilization of ultrafine titania particles synthesized by a sol-gel process
… polymeric stabilizers which imparted in-situ steric stability during the particle growth. An attempt was made to elucidate the factors which govern the particle size and morphology by studying the solvent-polymer-particle surface interactions. For this purpose, the effects of polymer …
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Modeling process dynamics in membrane-electrolyte-assemblies of chloralkali electrolyzers considering steric and hydration effects
The dynamic operation of the chloralkali electrolyzer has been considered as one of the solution for balancing the supply-demand fluctuation in the electricity grid. This opportunity becomes a motivation to study the complex transient behaviors of the electrolyzer caused by linked multiscale …
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Synthesis and microstructural characterization of phosphate cathode materials prepared by a polymeric steric entrapment precursor route
… (since 300 ºC) using an organic–inorganic steric entrapment solution, from precursor chemicals of LiNO3, Fe(NO3)3•9H2O and (NH4)2HPO4 stoichiometrically dissolved in distilled water. A long-chain polymer such as polyvinyl alcohol (–[CH2–CHOH]-n or PVA) having a degree of polymerization …
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Adsorption of Novel Block Copolymers for Steric Stabilization and Flocculation of Colloidal Particles in Aqueous Environments
… solution. The effect of adsorbed polymer on the steric stabilization of alumina particles was studied using sedimentation and electrophoretic mobility experiments. These results do not show conclusively that the triblock copolymer adsorption led to particle stabilization. It is possible that …
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Nuclear Magnetic Resonance Spectroscopic Studies of the Role Steric Effects in Molecular Interactions Using Rationalised Data Processing Procedures
… the approach of the solute to the aromatic is sterically hindered by substituents of greater bulk than three methyl groups. Such substituents in fact tend to exclude the solute. Finally, as a result of a study of a reference independent shift technique, a new method of determining magnetic …
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