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 44 for “"Ionic Surfactant"”.
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Novel microemulsions with an anionic/non-ionic surfactant mixture
Mikroemulsionen bestehen im einfachsten Fall aus Wasser, Öl und Tensid(en). Es handelt sich dabei im Gegensatz zu normalen Emulsionen um transparente, thermodynamisch stabile Phasen. Diesen makroskopisch einphasig erscheinenden Systemen liegen jedoch hoch komplexe Nanostrukturen zu Grunde. Die in …
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Development of non-ionic surfactant vesicles for inhaled drug delivery
Non-ionic surfactant vesicles (NIVs) provide similar bioavailability as liposomes but they are associated with higher stability profiles and reduced production cost. However, NIVs formulations are limited by the stability of the encapsulated drug and little is know about their use for inhaled …
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Theoretical modeling of micellization and solubilization in ionic surfactant systems
Ionic surfactants constitute a very important class of surfactants, both from an academic as well as from a commercial viewpoint. In most commercial applications involving ionic surfactants, the selection of the surfactant is based on its aqueous bulk solution properties, including its …
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Theoretical and experimental investigations of electrostatic effects associated with ionic surfactant micelles
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1998.
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The use of non-ionic surfactant vesicles to prevent radiocontrast media-associated damage
… formulate and characterise a novel iohexol-non-ionic surfactant vesicle (IOX-NIV) delivery system in line with FDA recommendations. This work adds to current knowledge of IOX-associated cytotoxicity and its influence on vessel function. IOX-NIVs were prepared using a 3: 3: 1 mol. ratio of …
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Formulation of non-ionic surfactant vesicles for therapeutic delivery of siRNA in cancer treatment
… another type of lipid-based system known as non-ionic surfactant vesicles (NISV) which are commonly used for drug delivery of various therapeutic agents, are relatively safe and non-expensive have not been extensively studied for siRNA delivery. Therefore, the aim of this study was to investigate …
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Non-ionic surfactant vesicles as an Amphotericin B inhaled delivery system for the treatment of leishmaniasis
… and Abelcet®). In this study, inhaled AmB non-ionic surfactant vesicles (AmB-NIV) were assessed as an alternative AmB formulation, which should reduce costs, enhance drug bioavailability and stability and allow a non-invasive route of administration. AmB-NIV formulations (freshly prepared or …
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Multiphase, Multicomponent Systems: Divalent Ionic Surfactant Phases and Single-Particle Engineering of Protein and Polymer Glasses
… properties and phase behavior of divalent ionic surfactant salts, and protein and polymer glasses. There has been extensive interest in understanding the phase behavior of divalent ionic surfactants due to the many applications of ionic surfactants in which they come into contact with …
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Effects of the Non-ionic Surfactant Tween 80 on the Enzymatic Hydrolysis of Model Cellulose and Lignocellulosic Substrates
Non-ionic surfactants are known to enhance the biochemical conversion of lignocellulosic (LC) biomass to bioethanol. Their mechanisms of action, however, are incompletely understood. This research was conducted to elucidate the effects of the non-ionic surfactant Tween 80 on the enzymatic …
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Influence of surface tension and concentration of a non-ionic surfactant on the barrier effectiveness of a microporous polypropylene fabric for pesticide protective clothing
… tension (γ) of aqueous solutions of a non-ionic surfactant on the barrier effectiveness of a fabric containing microporous polypropylene (PP) film that may be used in pesticide protective clothing (PPC). Aqueous solutions of Triton® X-100, a non-ionic surfactant, at various concentrations …
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Investigation of minor groove binders (MGB), non-ionic surfactant vesicles (NIV) delivery systems and IL-4i1 as novel pathogen- and host-directed drug therapy for tuberculosis
… being non-toxic. Encapsulation of MGBs into non- ionic surfactant vesicles (NIVs) demonstrated a 1.6- and 2.1-fold increased intracellular mycobacterial activity, similar to that of rifampicin when compared with MGB alone. Treatment with MGB 364 or MGB 364 formulation did not cause DNA damage in …
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A Mesoscale Dynamics study of the phases in surfactant-water ternary systems
… molecules to control phase structures in non-ionic surfactant-water systems. The ability to control phase structure has positive implications for potential templating applications which require ordered and stable phases with high surface curvature. The phases present in such systems were …
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Development and Implementation of Dispersion Phase Diagrams (DPDs) for Four Different Hydrophobically Modified Ethoxylated Urethane (HEUR) Based Acrylic Paint Systems
… of paint include associative thickeners, surfactants, pigments and fillers with the thickener being the primary area of focus for this study.</p> <p>The relatively simple system of latex, associative thickener and surfactant has been studied extensively. These studies have shown the …
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Production of nano-templated surfaces for quartz crystal microbalance
… route using high concentrations of non-ionic surfactant in the liquid crystal matrix in order to fabricate a high surface area silver electrode onto the gold electrode substrate of an Electrochemical Quartz Crystal Microbalance (EQCM). Deposition onto the EQCM allowed the unconventional …
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Studies using luciferase-expressing Leishmania donovani parasites
… were also carried out to determine if non-ionic surfactant vesicles (NIV) were capable of enhancing luciferin delivery and increasing parasite detection sensitivity by measuring bioluminescence using the IVIS® imaging system. Treatment with luciferin-non-ionic surfactant vesicles resulted …
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A study of the effect of anaesthetic molecules on model membranes formed in surfactant / water mixtures
… models used for biological membranes were simple surfactantiwater systems, which have been previously well studied and characterised. The phases they form are sensitive to changes in composition and interfacial architecture, though they lack the complexity of real membranes. Previous studies on …
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Fabrication of carbon-aerogel electrodes for use in phosphoric acid fuel cells
… was found that the use of a 25% solution of the surfactant Cetyltrimethylammonium chloride (CTAC) in water resulted in the creation of micelle within the pores of the organic aerogel. The micelle allowed the aerogel to be air dried while maintaining the desired pore composition. Further testing …
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Effect of fertilizers and adjuvants on quizalofop, sethoxydim, and thiameturon foliar uptake and weed control
… (AS), petroleum oil concentrate (POC), and non-ionic surfactant (SURF) were evaluated as postemergence spray additives to improve giant foxtail (Setaria faberi Herrm.) and volunteer corn (Zea mays L.) control by 28 g ai/ha of the ethyl ester of quizalofop $\{({\pm})$-2- (4 …
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Fracture Stimulation by Nano-assisted Foam-based Fluids in High-Temperature Reservoirs
… proppants in the fractures. However, while surfactant agents are mainly used to generate and stabilize liquid foams, they tend to degrade very quickly at high temperatures and high salinity, resulting in reduced stability and poor performance of fracturing foams at reservoir conditions. The …
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Part I: In-situ fluorometric quantification of microalgal neutral lipids Part II: Thermal degradation behavior of investment casting polymer patterns
… (O/W) microemulsion stabilized by a non-ionic surfactant was employed as a pseudo-standard that mimics lipid-bearing microalgal cells suspended in water. The average neutral lipid contents determined were very close to the results obtained by traditional gravimetric method and solid phase …
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