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 525 for “"surfactants"”.
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Emulsion Polymerization Using Switchable Surfactants
… on expanding the use of CO2-triggered switchable surfactants in emulsion polymerization of hydrophobic and hydrophilic monomers. Bicarbonate salts of the following compounds were employed as surfactants in the emulsion polymerization of styrene, methyl methacrylate (MMA) and/or butyl methacrylate …
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Interaction of oils with surfactants
… is concerned with the interactions of oils with surfactants. The understanding of these interactions is important for a number of practical applications which include perfume delivery in fabric softeners. Both non-ionic surfactants, of the general formula H( CH2)n( OCH2CH2)m-OH, and lome …
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The mesophase structure of surfactants
The binary surfactant system nona (ethylene glycol) mono-( 11 -oxa- 14,18.22,26-tetramethylheptacosylether) in heavy water has been investigated using deuterium nuclear magnetic resonance, optical polarising microscopy and small angle scattering techniques. The phase diagram has been established …
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Surfactants and enhanced oil recovery
… of commercial and some novel Brunel synthesised surfactants have been studied with a view to their potential usefulness for enhanced oil recovery (EOR) application. Ethoxylated phenols and their sulphonated derivatives were given especially high priority. The surfactants were well-characterised …
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Dynamic properties of seawater surfactants
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1996.
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Synthesis and Use of Chiral Surfactants.
… been previously shown that micelles formed from surfactants with chiral head groups serve to induce a chiral reaction medium, leading to enhanced enantioselectivities in the reaction products. This utilization of chiral surfactants will offer an economical alternative to traditional chial …
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Hydrate Formation Using Dowfax Gemini Surfactants
… This work investigates the effect of two Dow surfactants, Dowfax 2A1 and Dowfax C6L, on gas hydrate formation, first by determining the adsorption isotherms via liquid-liquid titration methods, and then investigating the role in methane hydrate formation in a non-stirred batch reactor. Both …
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Hyperbranched polyglycerol surfactants: a modular approach
… of amphiphiles has led to a broad new range of surfactants for industrial and medical applications. Hyperbranched polyglycerols (HPGs) have been employed as a nonionic hydrophilic material with high salt stability. In this work the HPG scaffold has been used to develop a series of different …
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A new class of photoresponsive surfactants
… thesis, a new class of nonionic, photoresponsive surfactants consisting of a polar di(ethylene oxide) head group attached to an alkyl spacer of between two and eight methylene groups, coupled through an ether linkage to an azobenzene moiety, were synthesized and developed. Structural changes …
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Electrokinetic separations involving surfactants and proteins
Methods for the analysis of surfactants and proteins by Capillary Electrophoresis (CE) were investigated. Several modifications of the system to achieve detection and separation of these analytes were examined. These modifications included buffer additives, sample additives and surface treatment …
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Langmuir Monolayers of Minimal-linker Dimeric Surfactants
Surfactants are ubiquitous, useful compounds of immense practical significance in key industries ranging from drug-delivery to agrochemicals. The performance of these commercially valuable products depends largely on their chemical structure. The objective of the research presented in this thesis …
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Analysis of organosilicone surfactants and their degradation products
… and quantitation of the organosilicone surfactants. Consistently reproducible quantitative results were achieved using an online HPLC separation system. Atmospheric pressure chemical ionisation (APcI) was used to enable high sample throughput, and the resulting HPLC/APcI/MS data obtained …
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Interaction of azobenzene containing surfactants with plasmonic nanoparticles
… between noble metal nanoparticles and cationic surfactants containing azobenzene units in their hydrophobic tail, employing absorption spectroscopy, surface zeta-potential, and electron microscopy. In the first part of the thesis, the formation of complexes between negatively charged laser …
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Synthesis of Chiral Surfactants for Enantioselective Organic Synthesis.
<p>The first step of the synthesis of the hydrocarbon-based chiral surfactant <b>(2)</b> involved the methylation of (S)-leucinol to give (2S)-N-hexadecyl-N,N-dimethyl-(1-hydroxy-4-methyl-1-pentyl)-2-ammonium bromide (2.92g, 67%). The chiral surfactant was synthesized by reacting …
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