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Showing 1 to 20 of 27 for “"Surface active agents"”.
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Studies on the Adsorption of Surface Active Agents by Staphylococcus Aureus
Made available in DSpace on 2014-12-05T19:06:46Z (GMT). No. of bitstreams: 1 5900516.pdf: 6315291 bytes, checksum: eea42a0395952378a3ece555a4f3c7a3 (MD5) Previous issue date: 1958
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Bacterial coagulation by a chlorinated solvent
… in changing from room temperature. S. proper surface active agents aided in the coagulation of bacteria in the solvent ooagulation process. 6. Almost all of the bacteria in suspension after the coagulation process were not viable. 7. Good removals were observed using the solvent coagulation …
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The amino acid and monosaccharide content of the cell walls of Thiobacillus thiooxidans
… Type Culture Collection Number 8085. The surface active agents Tergitol 08 and Tween 80 were investigated for their ability to reduce the lag period found in the growth of T. thiooxidans. Although a concentration of 12.5 ppm Tween 80 did decrease the lag period, the use of these …
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Complementary use of computer simulations and molecular-thermodynamic theory to model surfactant and solubilizate self-assembly
Surfactants, or surface active agents, are used in many pharmaceutical, industrial, and environmental applications. Selection of the appropriate surfactant or mixture of surfactants for any given application is driven by the need to control bulk solution micellization and solubilization …
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Study of Surface Tension, Natural Evaporation, and Subcooled Boiling Evaporation of Aqueous Surfactant Solutions
<p>The relation between surface tension and surfactant concentration and its effect on solution evaporation under natural convection and subcooled pool boiling is examined through experimental methods. Aqueous solutions of sodium lauryl sulfate (SLS), ECOSURFTM EH-14, and ECOSURFTM SA-9 are used in …
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Inhibition of Proteus Swarming by the Metabolic Products of Serratia Marcescens
… agar media. Swarming is a cyclic pattern of active motility and stationary growth away from a point of inoculation giving rise to concentric rings of growth on the agar surface (Fig. 1). On media that is exceptionally moist, the concentric rings may be absent and swarming may only appear as a …
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Production of stable bcs class ii drug suspensions by melt emulsification and subsequent incorporation into polymer strip films
… is to produce fine drug particles with increased surface area. This increase will lead to bioavailability enhancement. However, smaller drug particles are thermodynamically unstable and tend to aggregate or grow. Therefore, proper formulation and process parameters must be chosen to keep the …
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Mechanisms of heat and mass transfer to and from single drops freely-suspended in an air stream
… The effects of substances that may provide drop surface rigidity (e.g. surface active agents, binders and polymers) on mass transfer rates were investigated by doping distilled de-ionised water drops with sodium di-octyl sulfo-succinate surfactant. Mass transfer rates decreased with reduced drop …
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Comparison of transport effects of perfluorinated and hydrocarbon surfactants on environmental co-contaminants
<bold>ABSTRACT</bold>COMPARISON OF TRANSPORT EFFECTS OF PERFLUORINATED AND HYDROCARBON SURFACTANTS ON ENVIRONMENTAL CO–CONTAMINANTSByRashad Najee Simmons The use of groundwater as drinking water justifies efforts for the prevention and remediation of groundwater contamination by environmental …
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Lattice models of amphiphile and solvent mixtures.
… Their importance derives from their behaviour as surface-active agents in solubilization applications and because of their ability to form systems with varying degrees of structural order such as micelles, bilayers and liquid crystal phases. The nature of the molecular ordering is of importance …
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Sugar-Derived Oleogels in Cosmetics and Food Applications: a Case Study of Trehalose- and Mannitol-Based Gelators
… of adsorbing at the interface and behaving as surface active agents are known as surfactants. Alcohol sugars have been successfully used for the synthesis of LMWGs and found their application across various industries. Trehalose has been used in cosmetic products as antioxidant, skin protectant …
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A computer simulation and molecular-thermodynamic framework to model the micellization of ionic branched surfactants in aqueous solution
Surfactants, or surface active agents, are chemicals exhibiting amphiphilic behavior toward a solvent. This amphiphilic character leads to increased activity at interfaces and to self-assembly into micellar aggregates beyond a threshold surfactant concentration, referred to as the critical micelle …
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Investigation into interactions between emulsifiers and wheat starch/wheat flour
… has been the use of emulsifiers. Emulsifiers are surface-active agents, some of which improve specific properties of baked products. Two emulsifiers, sodium stearoyl lactylate (SSL) and oleyl lactylic acid (OLA) are similar in structure, the difference being the acid moiety: stearic versus oleic …
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Materials and coatings derived from the polymerizable ionic liquid surfactant 1-(2-Acryloyloxyundecyl)-3-methylimidazolium bromide
<p>The polymerizable ionic liquid surfactant, 1-(2-acryloyloxyundecyl)-3- methylimidiazloium bromide (IL-Br) was synthesized. The ternary phase diagram of the ILBr/ MMA/water system was constructed at 25 and 60 °C. Several microemulsion polymerizations were carried out, yielding materials that …
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Development of an analytical method to derive hydrophobicity parameters for use as descriptors for the prediction of the environmental and human health risk of chemicals
… ionised under the conditions of analysis and surface active agents. An alternative technique to assess hydrophobicity is Immobilised Artificial Membrane High Performance Liquid Chromatography (IAM-HPLC). The IAM stationary phase was developed initially to mimic biological membranes more …
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Synthesis and resolution of enantiomeric quaternary ammonium halides
The purpose of the work described in this thesis was the synthesis of a new class of surfactants containing chiral cationic end groups and the synthesis of two chiral reactant molecules which would react in the presence of these surfactants. The structures of the surfactant and substrate molecules …
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Spectroscopic studies of hydrophobic association of merocyanine dyes in cationic and anionic micelles
<p>Merocyanine dyes exhibit interesting changes in absorption spectra with changes in solvent polarity. For example solutions of 1-methyl-4- (oxocyclohexadienylidene) ethylidene -1,4-dihydropyridine (MOED) are yellow, red, violet, or blue, in water, ethanol, acetone or pyridine …
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Thermocapillary convection in laser melted pools during materials processing
… in the molten region is induced by buoyancy and surface tension (thermocapillary) forces. This motion of the liquid metal causes heat to be redistributed (convective heat transfer) which in turn effects the melt pool shape (solid/liquid interace), local temperature gradients, and ultimately, the …
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Amphiphilic hyperbranched polyglycerols for industrial and biomedical applications
… including live cell encapsulation, cell surface decoration, and antifouling coatings. The wide range of uses exemplify their modularity and utility. Herein, we report two distinct amphiphilic HPG materials designed for applications in nanomedicine and industry. Theranostic agents have the …
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The stimulation or inhibition of growth and acid precipitable material production of Vibrio Fetus by Kreb's cycle intermediates, fatty acids, amines, and miscellaneous compounds
… lactate, pyruvate, fatty acid, amines, surface active agents, aminobutyrate, hydroxybutyrate, glutathione, asparagine, phenylacetyl chloride, and sodium bicarbonate. Experimental media consisted of the chemically defined medium containing various concentrations of the test compounds. An …
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