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 56 for “"dilute solution"”.
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The Computer Simulation of Dilute Solution Particle Dynamics
… behavior of arbitrary bead/rod/spring models in dilute solution is described. Equilibrium, shear and extensional flow fields are considered. The program tracks particles individually and is therefore capable of calculating statistical averages of a wide range of properties; particle inertia and …
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The effect of gamma radiation on certain pure vitamins in dilute solution
Thesis: M.S., Massachusetts Institute of Technology, Department of Food Technology, 1960
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Dilute solution studies of molecular weight distributions of nitrocellulose, modified lignins and PMMA graft polymers
Dilute solution properties of three difficult-to-analyze macromolecular systems were investigated and clarified. Two were notorious for having highly time-in-solution dependent properties, nitrocellulose and lignin, while the third was an ideal model branched methacrylate polymer with which to …
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Study of the dilute solution properties of various homo- and block co-polymers by variable temperature size exclusion chromatography
… Chromatography (VTSEC) was used to study the dilute solution properties of various homo- and block copolymers as well as polymer blends, focus being primarily on the configuration-dependent properties such as average chain dimensions and hydrodynamic behavior of polymers. The study constituted …
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Heats of Neutralization of Sodium and Potassium Hydroxides with Sulfuric and Hydrochloric Acids Measured in an Ice Calorimeter
… strong acid and a strong base react together in dilute solution affords a test in favor of Hess’s theory of ionization. In the case of the interaction of HC1 with KOH, or NaOH, in solution there is a remarkably close agreement among the values of deltaH. The average value is deltaH = -13.8 Kg cal …
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Phenylene Vinylene Based Supramolecular Materials: Triblock Rodcoil Molecules and Highly Branched Amphiphiles
… dendrimers and their self assembly in aqueous solution was investigated. The amphiphiles contain lysine derivatives as the hydrophilic segments and phenylene vinylene as the rigid hydrophobe. The larger cross section and planarity of the hydrophobe is a unique design within amphiphilic …
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Multi-Scale Assembly Methodologies of Poly(3-Hexylthiophene) Derivative Systems for Enhanced Optoelectronic Anisotropy
… advantages of macromolecular systems, including solution processing and mechanical flexibility, conjugated polymers have become a burgeoning field of research with the hopes of producing cost-effective solution-based electronics. Importantly, optoelectronic device performance is heavily …
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ΕΙΣΑΓΩΓΗ ΚΑΙ ΜΕΛΕΤΗ ΜΙΑΣ ΝΕΑΣ ΚΡΙΣΙΜΗΣ ΣΥΓΚΕΝΤΡΩΣΗΣ ΣΤΗ ΠΕΡΙΟΧΗ ΤΩΝ ΑΡΑΙΩΝ ΜΑΚΡΟΜΟΡΙΑΚΩΝ ΔΙΑΛΥΜΑΤΩΝ
… NEW CRITICAL CONCETRATION C** WHICH SEPERATE THE DILUTE SOLUTIONS IN TOW REGIMES. THE REGIME OF VERY DILUTE SOLUTIONS C C<C** AND THE REGIME OF DILUTE SOLUTION (C>C**). IT IS PROPOSED A MODEL WHICH DESCRIBE THIS CRITICAL CONCENTRATION. THE INFLUENCES IN THIS CRITICAL CONCENTRATION OF THE SOLVENT, …
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Thermal conductivity in organic semiconducting polymers
… quantifies the stiffness, of these polymers in dilute solution was determined both experimentally and computationally; although this was an interesting topic on its own, no explicit correlation was found between persistence length in dilute solution and thermal conductivity in thin films with …
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Synthesis and Characterization of Branched Macromolecules for High Performance Elastomers, Fibers, and Films
… that were developed based on slow addition of dilute solution of poly(ethylene glycol) (PEG) (A2) to a dilute solution of 1,3,5-benzenetricarbonyl trichloride (B3) at room temperature in the presence of triethylamine. A revised definition of the degree of branching was proposed to accurately …
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Importance of hierarchical interactions in concentrated protein systems
… each other causing a sharp rise in viscosity of solution. To reduce the production cost, we need to predict the viscous behavior of molecules in the early stages of drug development. We develop a method to use dilute solution measurements to predict the antibody viscosity. We translate the …
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Modification, curing and flame retardation of epoxy resin networks
… differential scanning calorimetry (DSC), dilute solution viscosity, potentiometric titration of their end groups and model chain extension reactions. Thermoplastic modification of the epoxy networks was demonstrated to afford materials with improved fracture resistance. Two glass …
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Synthesis and self-assembly of multiple thermoresponsive amphiphilic block copolymers
… of multi thermoresponsive block copolymers in dilute aqueous solution was investigated by a combination of turbidimetry, dynamic light scattering, TEM measurements, NMR as well as fluorescence spectroscopy. The successive conversion of such block copolymers from a hydrophilic into a hydrophobic …
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Morphology and Conformation of Polythiophene Derivatives in Anisotropic Core-Shell Nanocomposites and Solution
… polythiophenes are investigated in dilute solution through the use of ultraviolet-visible absorption spectrophotometry. A coil-to-rod conformational transition is identified, and is found to be induceable through temperature and solvent changes. Study into the kinetics of the …
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Statistical Physics of Semidilute Polymer Systems (And); Soft Billiard Systems
… In the first part, we carefully study the semidilute regime of polymer solutions. The renormalization group (RG) method using the $\varepsilon$-expansion has been a systematic method giving good semiquantitative agreement with both real and computer experiments for the static and dynamical …
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Oriented polymer crystal growth from flowing solutions
The kinetics of dilute solution flow-induced crystallization in a tubular flow geometry have been quantified for several polymer systems using digital image processing to observe and monitor the birefringence of the crystallizing fiber. Three molecular weights of polyethylene were studied in 0.01 …
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Hydrogen bond rearrangements and the motion of charge defects in water viewed using multidimensional ultrafast infrared spectroscopy
… applied to the O-H stretching transition of a dilute solution of HOD in NaOD/D20. The frequency of the O-H stretch, (OH, is highly sensitive to the configuration of its hydrogen bonding partner. 2D IR spectroscopy allows us to measure rapid shifts in OH that reveal time scales for changes in …
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Molecular Modeling Studies of Dendrimers and Hyperbranched Polymers
… investigate the single-molecule behavior in the dilute solution and the Tube Model is utilized to investigate the dynamics in the entangled state. The Fokker-Planck equation from the general bead-rod-spring phase space formalism of Bird and co-workers is converted to a Stochastic Differential …
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Induced-charge electrokinetics at large voltages
… (PB) theory of electrolytes assumes a dilute solution of point charges with mean-field electrostatic forces. Even for very dilute solutions, however, it predicts absurdly large ion concentrations (exceeding close packing) for surface potentials of only a few tenths of a volt, which are …
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Surfactant Formulations for Water-Based Processing of a Polythiophene Derivative
… properties. A relationship between the dilute-solution processing with surfactants and the final properties of the system is substantiated.</p>
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