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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 52 for “"critical micelle concentration"”.
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Synthesis, Characterization, Critical Micelle Concentration and Antimicrobial Activity of Two-headed Amphiphiles
… protecting group to give the 2CCbn series. The critical micelle concentrations (CMC) were measured by the pyrene-based fluorescent probe method. The pyrene excited at 345 nm and fluoresces with maxima at 374 nm (I1) and 385 nm (I3). The stock solution and the dilution series for each amphiphiles …
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Synthesis, Characterization, Critical Micelle Concentration and Biological Activity of two-Headed Amphiphiles
… the tert-butyl protecting groups to give 2CAmn. Critical micelle concentration measurements were collected by the pendant drop method for measuring surface tension for a series of triethanolamine/2CAmn solutions to establish the concentration required for detergency. The CMCs for the 2CAmn series …
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Elaboration of micelle formation in aqueous and two phase solutions by surface active phosphines
… N+)3,1, aggregates in aqueous solution to form micelles. Light scattering experiments were used to determine the hydrodynamic radius of the aggregates. Fluorescence, conductivity, and surface tension experiments were used to measure the critical micelle concentration of these aggregates. …
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Micellar properties of spermicidal and microbicidal quaternary ammonium surfactants
… and hydrophilic moiety, will aggregate into micelles when dissolved in water above a narrow concentration range, termed the critical micelle concentration (CMC). This project investigates how the CMC relates to spermicidal and microbicidal properties. The CMC’s of the AD-nX and AT-nX …
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Synthesis and characterization of pH/temperature dual sensitive multiblock copolymer for drug delivery
… change in sol-gel transition temperature and critical micelle concentration. This mechanism confers the synthesized polymer with pH/temperature instigated drug release properties and thus can be used for targeted drug delivery applications.
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Fundamental properties and potential applications of two surfactant groups produced from renewable resources
… thermodynamic parameters, such as the CMC (critical micelle concentration) and the HLB value (hydrophilic-lipophilic-balance) and compared the results with a number of commercial products manufactured from fossil raw materials. Given the negative consequences that petroleum-based mass …
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Admicellar Polymerization Of Calcium Carbonate And Its Performance In Drilling Fluids
… Adsorption isotherms of SDS decrease after the critical micelle concentration (CMC) of SDS was observed. This is explained by the phase behavior of SDS with calcium ion. The solubility product constants (Ksp) for calcium dodecylsulfate (Ca(DS) 2) were calculated as 1.55x10?9M3 at 30°C and …
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Mechanistic investigation of skin barrier perturbation induced by surfactants in the presence of humectants
… solutions. SDS monomers self-assemble to form micelles at a SDS concentration above the Critical Micelle Concentration (CMC). The SDS skin penetration and associated skin barrier perturbation is dose-dependent, that is, it increases with an increase in the total SDS concentration above the CMC …
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Theoretical and simulations-based modeling of micellization in linear and branched surfactant systems
… in aqueous solution as a function of surfactant concentration, including: (i) formation of surfactant monolayers at surfaces and interfaces, and (ii) self-assembly into finite aggregates (micelles) in the bulk solution beyond the critical micelle concentration (cmc). This concentration-dependent …
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Computer simulation of micelle self-assembly.
… amphiphile model to study the self-assembly of micelles. Analysis of the results from these simulations shows that the models exhibit a critical micelle concentration together with cluster size distributions consistent with experiment and theory. Simulations of the single amphiphile model also …
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Surfactants in nonpolar oils: agents of electric charging and nanogel templates
… the residual water content, and the surfactant concentration above and below the critical micelle concentration provides insights about the possible charging pathways. Reverse surfactant micelles are explored not only as charging agents, but also as reactors and templates for the synthesis of …
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Tuning polymeric chiral surfactants for enhanced enantiomeric recognition in micellar electrokinetic chromatography
… was used for the determination of the critical micelle concentration (cmc), fluorescence measurements were used for the determination of the polarity of the modified polymeric surfactants. The information about the size of the polymeric surfactants was obtained by use of pulsed field …
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Physicochemical characterization of PEG-based comb-like amphiphilic copolymer structures for possible imaging and therapeutic applications
… copolymer structures was characterized by their critical micelle concentration (the lower this concentration, the higher the stability), which was determined by total intensity light scattering and surface tension measurement. The size, morphology, and detailed structural information were studied …
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Factors Affecting Fuel Transport of Firefighting Foam
… the fuel transport mechanism and role of micelle on fuel transport. Surfactant and fuel interaction has been studied below, at, and above the critical micelle concentration of surfactants. The effect of surfactant concentration, convection, and surfactant types were observed on the fuel …
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Monte Carlo simulations of amphiphilic systems.
… It is demonstrated that the model exhibits a critical micelle concentration together with cluster size distributions consistent with experiment and theory (minimum and maximum in the distribution within the micellar region). The weight average aggregation number, N[w], increases linearly with …
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Lattice models of amphiphile and solvent mixtures.
… with varying degrees of structural order such as micelles, bilayers and liquid crystal phases. The nature of the molecular ordering is of importance both during the processing of these materials and in their final application. A Monte Carlo simulation of a three dimensional lattice model of an …
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Solubilisation and emulsification of silicone oils in aqueous surfactant systems
… temperature, surfactant structure, electrolyte concentration and PDMS molecular weight on the emulsion phase inversion of water/PDMS/surfactant systems has been studied in detail. For certain nonionic surfactants the equilibrium phase behaviour of equal volumes of water and oil has been studied …
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Surfactant Aggregation in the Bulk Fluid and at the Fluid-Wall Interface
… and characterize the formation of hemimicelles at the solid-fluid interface. Using a simple surfactant model consisting of Lennard-Jones sites connected by non-harmonic springs many features of real bulk surfactant solutions, including the critical micelle concentration (cmc), are …
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A SSIMPLE Approach to Surfactant Self-Assembly using DPD Simulations
… comparing experimental properties such critical micelle concentration, aggregation number and micelle shape with those obtained from simulations. Finally, the Setschenow equation, which describes the solubility dependency on the salt concentration, was used to parametrise the …
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A computer simulation and molecular-thermodynamic framework to model the micellization of ionic branched surfactants in aqueous solution
… aggregates beyond a threshold surfactant concentration, referred to as the critical micelle concentration (CMC), in bulk solutions. As a result of these unique attributes, surfactants are used in many pharmaceutical, industrial, and environmental applications, including biological …
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