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Showing 1 to 18 of 18 for “"Anionic Surfactants"”.
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Syntheses of Multi-headed, Two-tailed, Anionic Surfactants as Topical Microbicides
… of a series of multi-headed, two-tailed anionic surfactants (3CAm1(n)2) as anti-HIV microbicides, and to compare the biological activities of these compounds to the activities of their straight-acyl chain derivatives. The synthesis requires coupling reaction of dialkylacetic acid …
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Assessment of co-occurrence of cyanotoxins, toxic metals and anionic surfactants in irrigation water, agricultural soils and food crops
… investigated the co-existence of cyanotoxins, anionic surfactants and metal species in irrigation water, agricultural soils and food crops and determine the health risks associated with consuming cyanotoxins contaminated plants in the Crocodile (West) Marico Water Management Area, which covers …
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The damaging potential of pesticide formulations on human skin
… The major excipient responsible was the divalent anionic surfactant Phenylsulphonate CA. Another divalent anionic surfactant Empicol ML26/F also caused stratum corneum barrier function impairment. Protection against anionic damage was achieved using polyoxyethylated nonionic surfactants of the …
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Interactions between solutes in displacement solutions and oil bearing rocks.
Studies of adsorption of several surfactants from aqueous solution onto kaolin have been made, such as might be employed in an enhanced oil recovery process. Investigations of the surfactants were carried out with regard to pH, ionic strength, temperature, the addition of short chain aliphatic …
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Mesoporous Functionalized Materials for Post-Combustion Carbon Dioxide Capture.
… in presence of cationic and anionic surfactants. Reaction media strongly affected gelation time. Thus, in basic media gelation occurred immediately while acid increased gelation time. Material structures were studied by IR spectroscopy, porosimetry, XRD, and SAXS methods. In …
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Foam-surfactant technology in soil remediation
… were used as representatives of nonionic and anionic surfactants, respectively. The results obtained from this study on a sandy soil showed that foam can be used as a fluid to enhance soil remediation under low pressures compared to other fluids such as liquid surfactant solutions.
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Design of Viscoelastic Surfactant-oil-water Structures with the Hydrophilic-lipophilic Difference (HLD) and Net-average Curvature (NAC) Frameworks
Manipulating the self-assembly of surfactants into viscoelastic structures such as wormlike micelles and liquid crystals is an important aspect in the development of personal care products and nanostructured materials. Central to this is the curvature of the surfactant membrane, which is one of the …
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Spectroscopic studies of hydrophobic association of merocyanine dyes in cationic and anionic micelles
… of merocyanine dyes were studied in cationic and anionic surfactants in order to investigate the behaviour of these dyes in micellar system and to use their electronic spectra as probes of the micellar environment.</p><p>Since the description of the literature and discussion of the experimental …
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Microemulsions formation, stability and their characterisations
… systems stabilised by pure nonionic surfactants and alcohol as well as mixtures of nonionic and anionic surfactants. Phase equilibria and interfacial characteristics of the systems are studied with a view to their potential usefulness for enhanced oil recovery, in which salinity and …
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Diffusion phenomena in oil-water-surfactant systems
… detergency. Experimentally, systems containing anionic surfactants and alcohol cosurfactants were studied by optical microscopy. A microscope which utilized a vertical sample orientation was specifically designed for this purpose. As a result, an Improved and detailed viewing of intermediate …
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Material Characterization, Patterning and Adsorbate Induced Modulation of Light Emission of Porous Silicon Produced by Metal -Assisted Electroless Etching
… behavior of PSi in aqueous solutions of ionic surfactants is undertaken by photoluminescence and Fourier Transform Infrared (FTIR) spectroscopy. Modulation of the light emission of PSi in surfactant solutions can be interpreted by changes in the depletion region of the semiconductor as a result …
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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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The synthesis of well-defined functional homo- and block copolymers in aqueous media via Reversible Addition-Fragmentation Chain Transfer (RAFT) Polymerization
… of 70°C. Subsequently, a series of non-ionic, anionic and cationic water-soluble monomers were polymerized via RAFT in water. In these experiments, polymerizations were conducted either at 48°C or 55°C, that are lower than the conventionally employed temperatures (>60°C) for RAFT in organic …
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Protein containing porous polymers for biocatalytic applications
… via the formation of ion-pairs with various anionic surfactants. It was shown that the enzyme remained in solution when transferred from organic solvents to a mixture of monomers. The dense gas porogen R134a was then added to the solution of enzyme in monomer, prior to the initiation of a …
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Mg-Al Layered Double Hydroxide: A Potential Nanofiller and Flame-Retardant for Polyethylene
… The organic modification of Mg-Al LDH using anionic surfactants has been studied in details. The main purpose of such modification is to enlarge the interlayer distance and to render it more organophilic. The surfactants were selected based on their functionality, chain length, etc and the …
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Phase Behavior and Rheology of Latex, Thickener, Surfactant Mixtures and Liquid Crystal Based Compositions for Printing High-Efficiency Flexible Electronics
… latex, two associative thickeners, and two surfactants. Mixtures containing a small particle size acrylic latex and HEUR RM-825 exhibited the most interesting and complex phase behavior and rheology. In experiments wherein the latex particle volume fraction was kept constant, the addition of …
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Removal of Perfluorooctane Sulfonate (PFOS) and Related Compounds From Industrial Effluents
… sulfonate (PFOS) and related perfluoroalkyl surfactants (PFAS) are ubiquitous contaminants of increasing public concern due to their environmental persistence, toxicity, and bioaccumulation. These perfluorinated compounds have been used for more than half a century in a wide variety of …
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Aspects of the chemistry of milk protein films formed on stainless steel
… Desorption was facilitated by hydroxyl ions and anionic surfactants but no simple relationship between rate of desorption and species concentration was obtained. Simple adsorption process cannot account for the formation of macroscopic milk protein films on milk contact surfaces. After the …