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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 343 for “"Organic solvents"”.
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Polyol induced extraction (PIE) of water from organic solvents
… with large amounts of water, buffer and trace organic impurities. It would seem worthwhile to purify the ACN from water using a mass separating agent (MSA). In a quest for an MSA, our investigation reveals polyols as a new class of MSAs. It is observed that when a polyol such as glycerol, …
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The use of enzymes in organic solvents in polytransesterification reactions
… of a diester and a diol in organic solvents. It was hoped that by modifying reaction conditions a commercially acceptable polymer molecular weight (Mn) of 20,000 daltons might be attained. Exploratory investigations were carried out using 1,4-butanediolibis(2,2,2- …
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ZSM-5/thermoplastic polyurethane mixed matrix membranes for pervaporation of dilute aqueous organic solvents
The present study aimed to synthesize ZSM-5/thermoplastic polyurethane (TPU) mixed matrix membranes (MMMs) for efficient pervaporation of n-butanol and ethanol from dilute aqueous solutions as a cheap and easy to fabricate replacement for the benchmark polydimethylsiloxane (PDMS) membranes. Binary …
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Electrolyte Dependence on the Electrochemical and Optoelectronic Activity of a Conjugated Polymer in Organic Solvents
<p>Organic electronic devices rely on the redox and charge transport properties of conjugated polymers. Many high-performance electroactive polymers are hydrophobic and require processing in organic solvents. As such, these materials are characterized in nonaqueous electrolyte systems to evaluate …
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Evaluation of Neurotoxic Effect for the Low-Dose Mixed Organic Solvents Exposed Workers by using Posturography
… for detecting the neurotoxic effects of organic solvents before symptom appear. Therefore, this study was conducted using static posturography to investigate the neurotoxic effects on workers exposed to mixed solvents under the TLV level in Korea. Forty-one workers (mean age 41.5) from 4 …
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Scintillation counting of 32p without added scintillator in aqueous solutions and organic solvents, and on dry chromatographic media
Thesis (M.S.)--Michigan State University. Dept. of Biochemistry, 1970
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Part I. DNA Base and Base Analogue Pairing in Organic Solvents. Part II. Ring Closing Metathesis of Poly-Allylated Glycerol Dendrimers
Part II details cross linking of glycerol dendrimers using the ring closing metathesis (RCM) reaction. An iteratively cross-linked dendrimer was prepared by RCM of an allylated G-3.5 cross-linked dendrimer and the methodology developed for perfect dendrimers was subsequently applied to …
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Studies in the gas chromatography of ammonia, with special reference to packings containing solutions of silver salts in some organic solvents
It has been found that the gas chromatography of ammonia on certain fixed phases containing salts yields chromatograms consisting of a peak followed by a plateau or a succession of plateaux of progressively decreasing height. Such chromatograms have been interpreted in terms of ammine formation in …
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Studies in the gas chromatography of ammonia, with special reference to packings containing solutions of silver salts in some organic solvents
It has been found that the gas chromatography of ammonia on certain fixed phases containing salts yields chromatograms consisting of a peak followed by a plateau or a succession of plateaux of progressively decreasing height. Such chromatograms have been interpreted in terms of ammine formation in …
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An evaluation of the applicability of the EPA Organic Leachate Model to leaching of solvent and non-solvent wastes
… of the Environmental Protection Agency's Organic Leachate Model to wastes containing organic solvents and other organic compounds ("non-solvents"), and determined that the model tends to overestimate the leaching of organic solvents and other organic compounds. Furthermore, when evaluated …
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SAMPLE INTRODUCTION AND INSTRUMENTATION IN PLASMA SPECTROMETRY
… types. The successful introduction of volatile organic solvents has however been limited, due to the resulting high solvent loading of the plasma and subsequent plasma instability. The design, function and application of a number of novel desolvation systems have been investigated in this study …
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Analysis of aqueous matrices using supercritical fluid extraction in conjunction with chromatographic spectroscopic and mass spectrometric techniques
The use and supply of various organic solvents for analytical chemistry is coming under scrutiny due to their environmental impact. International legislation now prevents the supply of "ozone depleting" solvents for laboratory purposes. Consequently alternative analytical methods to those which had …
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Part I: Crystal Engineering Using Trimesic Acid Analogs. Part II: An Extremely Stable Hydrogen-Bonded Hexamer
… which provides suitable solubility in nonpolar organic solvents, and a 2-aminoethyl group which directs the self-assembly process of 1. The synthesis of 1 was accomplished from chloronaphthyridine 6 by a precedented nucleophilic cyclization with N-ethyl guanidine. It was found that 1 forms a …
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Metallodendrimers as catalysts for C-C coupling reactions
… ligands were observed to be soluble in common organic solvents. They were characterized by FTIR spectroscopy, 1H-NMR spectroscopy, 13C-NMR spectroscopy, micro-analysis and ESImass spectrometry.A reaction of the ligands with PdCl2(COD) or PdCl2(MeCN)2 gave palladium(II) complexes C1 – C4 in good …
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Síntese e caracterização de filmes de polietileno/poli(álcool vinílico) contendo nanopartículas de negro de fumo e sílica
… and processability, despite being permeable to organic solvents. In order to improve their barrier properties, the aim of this work was study the synthesis and characterization of HDPE and poly (vinyl alcohol) (PVA) mixtures, and verify the effect of crosslinking of PVA with maleic anhydride …
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Interactions of Nitrated Aromatics With Electron Rich Species: Chiral and Achiral
… charged Meisenheimer complexes in non-polar organic solvents. The gained mechanistic insight allowed the development of the first enantioselective nucleophilic aromatic substitution reactions.
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Molecular Dynamics Of Ionic Liquids In Nanoporous Electrodes
… the pores (pore loading) and concentration of organic solvent, in the case of mixtures of ILs with organic solvents. The results obtained in this work indicate that the properties of the nanoporous materials have a profound effect on the structure and dynamics of ILs. Formation of layers of ILs …
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