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.
Results
Showing 1 to 20 of 39 for “"Solvent mixtures"”.
-
Lattice models of amphiphile and solvent mixtures.
… dimensional lattice model of an amphiphile and solvent mixture has been developed as an extension of earlier work in two dimensions. In the earlier investigation the simulation was carried out with three segment amphiphiles on a two dimensional lattice and cluster size distributions were …
-
Thermochemical Study of Crystalline Solutes Dissolved in Ternary Hydrogen-Bonding Solvent Mixtures
… of nonelectrolyte solutes dissolved in ternary solvent mixtures, and to develop mathematical expressions for predicting and describing behavior in the solvent mixtures. Forty-five ternary solvent systems were studied containing an ether (Methyl tert-butyl ether, Dibutyl ether, or 1,4-Dioxane), …
-
Thermodynamical, structural, and dynamical characterization of solvent mixtures of technological interest: experimental and computational studies
… and ionic liquids(ILs)are solvents with “green” characteristics, such as low volatility and low toxicity. They can be used as a valid alternative to the common organic solvents with a high environmental, health and safety impact. The aim of my research was to investigate …
-
Application of COSMO-SAC to Solid Solubility in Pure and Mixed Solvent Mixtures for Organic Pharmacological Compounds
… Sigma Profile Database generally focuses on solvents and small molecules, while the VT-2006 Solute Sigma Profile Database primarily consists of larger, pharmaceutical-related solutes. We design both of these databases for use with the conductor-like screening model−segment activity …
-
Application of PC-SAFT Equation of State to Bitumen/Solvent Systems
Solvent-assisted process is promising to recovery Canada's bitumen recourses, but the prediction techniques for the solubility, density and viscosity of bitumen and solvent mixtures in reservoir simulation are not well developed. This thesis works to develop the application methodology of the …
-
An investigation of medium effects on the one and two-dimensional electronic spectroscopy of chlorophyll a
… Chlorophyll a, and their changes with different solvents. The study of the pigment was conducted by linear spectroscopic studies for water-solvent mixtures, while by the nonlinear technique 2D spectroscopy was applied for pure solvent. The theory and technique of 2D spectroscopy is described. The …
-
The alkaline hydrolysis of esters in aqueous-organic solvent mixtures. The effects of solvents and of the activity coefficients of reactants on the kinetics of the alkaline hydrolysis of methyl acetate in aqueous dioxan, aqueous dimethyl sulphoxide and aqueous diglyme (bis (2-methoxyethyl ) ether) mixtures as solvents.
… of methyl acetate in various aqueous-organic solvent mixtures (dimethyl sulfoxide 0<x40.2, dioxane 0 <, x., < 0.2, methyl ethyl ketone 0<x<0.06 and diglyme, i. e. ether-bis (2-methyloxethyl) 0x<0.10) have been determined for the temperatures 15 0 C, 25 0C and 35 0C conductometrically. To …
-
Polymer dynamics in bulk, adsorbed and solution by NMR methods
… resonance (PGSE ¹H NMR). The diffusion of solvents in polymer solutions is investigated. The diffusion of N-N, dimethylformamide in polystyrene is studied as a function of concentration and temperature. The diffusion coefficients of solvents in binary solvent mixtures of methylene …
-
N9 Alkylation and Glycosylation of Purines; A Practical Synthesis of 2-Chloro-2'-deoxyadenosine
… of the sodium salts in moderately polar solvents. Differential solvation effects in binary solvent mixtures were utilized to improve the stereoselectivity of glycosylation. The stereoselectivity varied with the sizes of lipophilic groups and the polarity of solvents. With the propyl …
-
Structure-property behavior of elastomeric telechelic ionomers in bulk and solution
… dilute solution viscometric behavior in nonpolar solvents and nonpolar-polar solvent mixtures as well as the viscoelastic behavior of more concentrated solutions in nonpolar solvents. Gelation was observed in nonpolar solvents at concentrations as low as 1-2 g/dl. The gelation concentration is …
-
Reaction calorimetry applied to kinetic problems. The design and construction of an isothermal calorimeter with heat compensation by the Peltier effect, and the application of the calorimeter in the study of reaction kinetics in solvent/water mixtures.
… in order to investigate reaction rates in solventwater mixtures. Because a thermal method was used a constant temperature environment was essential and this was achieved by using a water bath controlled to + 0.0010C. This callorinieter has been used to study the alkaline hydrolysis of …
-
Synthesis and Characterization of Disulfonated Poly(Arylene Ether Sulfone) Random Copolymers as Multipurpose Membranes for Reverse Osmosis and Fuel Cell Applications
… separation (DIPS) from various polar aprotic solvent or cosolvent systems is reported. The best aprotic solvents to generate an asymmetric structure were NMP and DMAc whereas tetrahydrofuran (THF)/ formamide (FAm) (80/20 v/v) mixtures proved to be the best co-solvent systems. Acetone was the …
-
Development and optimisation of supercritical fluid deposition of semiconductor films
… supercritical CO<sub>2</sub> and CO<sub>2</sub>-solvent mixtures. Ge was deposited into macropores etched into crystalline silicon substrates. A variety of reactors were designed in order to achieve the successful deposition of the materials. The surface morphology and crystallinity of the films …
-
Particle microstructure and polymer dynamics in concentrated polymer solutions
… Silica nanoparticles are suspended in polymer-solvent mixtures. The effects of polymer induced interactions on the particle microstructure are examined with varying (i) polymer concentration, (ii) solvent type, (iii) temperature, (iv) particle volume fraction and (v) polymer chemistry while …
-
Liquid collection efficiencies after supercritical fluid extraction
… to evaluate the collection efficiency of various solvents and solvent mixtures. Nine single collection solvents and four mixed collection solvent systems were studied. When one-component collection solvents were employed, quantitative (above 90%) recovery of all analytes was not possible. With …
-
Aplicación de la espectroscopia de resonancia magnética nuclear al análisis de embutidos
… in resolution was achieved when using solvent mixtures involving hexadeuterodimethyl sulfoxide. The new methodology allows the detection and quantification of diacylglycerides, monoacylglycerides, free fatty acids, and other minor components in one single, short experiment, as well as …
-
Ion dissociation and transport behavior in ionic liquids and ionic liquid solutions
… recently, focus has shifted to the study of IL/solvent mixtures to increase the range and efficacy of IL-applications. The diverse nature and complexity of these IL systems requires researchers to develop new techniques and metrics for understanding IL behavior by way of thermophysical …
-
SPECTROSCOPIC STUDIES OF SOME AROMATIC DECOMPOSITION INTERMEDIATES
… or ether- isopentane-ethanol solvent mixtures at 77°K« The structures of the radicals have been deduced by consideration of the furthermost red band in the spectrum and by the application of the generalizations of Porter and Strachan2 concerning the relative probabilities of …
-
Investigation of the Colloidal Behaviour of Carbon Black and Perfluorosulfonated Ionomer in Various Solvents
… investigated at different ionomer concentration, solvent type and solvent composition. Ionomer was found to exist in three forms in solution. Extended molecule chains having a hydrodynamic diameter between 20nm to 30nm. Primary aggregates formed by the hydrophobic interaction of fluorocarbon …
-
A study of inter- and intramolecular interactions through neutron compton scattering and low temperature matrix isolation infrared spectroscopy
… phase change, deuterated polymer/ solvent mixtures were studied on the VESUVIO instrument at the ISIS RAL facility, and the analysis of that data is presented. pNIPAAm and related compounds display a critical temperature for solvation above which they precipitate due to competition …
Page 1 of 2