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Influence of polymer architecture on the stabilization of iron and manganese ions in aqueous systems / Zahid Amjad in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 44, N° 4/2007 (08-09/2007)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 44, N° 4/2007 (08-09/2007) . - p. 210-217 Titre : Influence of polymer architecture on the stabilization of iron and manganese ions in aqueous systems Type de document : texte imprimé Auteurs : Zahid Amjad, Auteur Année de publication : 2007 Article en page(s) : p. 210-217 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Fer Manganèse Polymères Solutions aqueuses (chimie) -- Stabilité Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The influence of polymers as stabilizing additives for iron and manganese ions was investigated in an aqueous system. The polymers tested include : homo-polymers of acrylic acid, maleic acid, methacrylic acid, 2-acrylamido-2-methylpropane sulfonic acid; co-polymer of acrylic acid : vinyl acetate, acrylic acid : hydroxypropyl acrylate, acrylic acid : carbitol acrylate, acrylic acid : 2-acrylamido-2-methylpropane sulfonic acid; and ter-polymer of acrylic acid :methacrylic acid : acrylic acid : acrylic acid :2-acrylamido-2-methylpropane sulfonic acid : sulfonated styrene, acrylic acid : 2-acrylamido : t-butylacrylamide. It was found that polymer architecture i.e., monomer type, monomer charge, molecular weight, and polymerization solvent, strongly influences the performance of polymer as iron and manganese ions stabilizing additives. The stabilization data reveal the following order in terms of decreasing polymer performance: ter-polymer > copolymer > homo-polymer. DOI : 10.3139/113.100339 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3206 [article]

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The long-term stability of sodium percarbonate in presence of zeolite as measured by heat flow calorimetry / C. Johansson in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 44, N° 4/2007 (08-09/2007)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 44, N° 4/2007 (08-09/2007) . - p. 210-217 Titre : The long-term stability of sodium percarbonate in presence of zeolite as measured by heat flow calorimetry Type de document : texte imprimé Auteurs : C. Johansson, Auteur ; P. Pekonen, Auteur ; D. Forsström, Auteur Année de publication : 2007 Article en page(s) : p. 210-217 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de blanchiment Calorimétrie Peroxyde d'hydrogène Le peroxyde d'hydrogène (H2O2), communément appelé eau oxygénée ou encore perhydrol (appellation industrielle), est un composé chimique liquide et visqueux, aux puissantes propriétés oxydantes (il est aussi réducteur). C'est donc un agent blanchissant efficace qui sert de désinfectant et (à haute concentration) d'oxydant ou monergol dans les fusées spatiales. Sodium -- Composés organiques Sodium -- Composés organiques -- Stabilité Zéolites Tags : Sodium  percarbonate  15630-89-4 Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Heat flow calorimetry has been evaluated as an alternative technique to conventional stability testing of sodium percarbonate [15630-89-4] (SPC) based on analysis of the hydrogen peroxide content. Stability tests were performed with different SPC samples as well as under various experimental conditions. In general, stable samples exhibiting high concentration of hydrogen peroxide were accompanied by low heat flow values. It was found that the results obtained by heat flow calorimetry and conventional stability testing were in agreement. It was also demonstrated that the long-term stability could be predicted from heat flow data obtained during the initial stage of decomposition. Furthermore, different manufacturing and experimental conditions were manifested as a change of the heat flow curve. The results indicate that the rate of heat production is closely associated with the stability of sodium percarbonate, i.e. the rate of decomposition of sodium percarbonate. In presence of zeolite the stability of sodium percarbonate was reduced, particularly under humid conditions. DOI : 10.3139/113.100340 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3207 [article]

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A novel method for the synthesis of mesoporous TiO2 at ambient temperature / X.-M. Tai in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 44, N° 4/2007 (08-09/2007)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 44, N° 4/2007 (08-09/2007) . - p. 218-220 Titre : A novel method for the synthesis of mesoporous TiO2 at ambient temperature Type de document : texte imprimé Auteurs : X.-M. Tai, Auteur ; Z.-P. Du, Auteur ; W.-X. Wang, Auteur ; J. F. Zhang, Auteur Année de publication : 2007 Article en page(s) : p. 218-220 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Mesoporous  Nanocrystal  Synthese  AEC9Na  Ambient  temperature Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Using anionic surfactant sodium alkyl epoxy ethylene carboxylate as structure-oriented agent mesoporous titanium dioxide was direct prepared at ambient temperature via hydrolysis precipitation. The synthesized products were characterized by XRD and N2-adsorption. XRD analysis indicates that the TiO2 exhibits anatase phase and its pore disappears at 550° calcinations temperature. N2-adsorption results shows that high surface area of 324m2/g, pore volume of 0.211cm3/g and pore size of 3.5nm were obtained in no heat-treated sample. DOI : 10.3139/113.100341 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3208 [article]

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Sanitary ware with easy cleaning and/or antibacterial properties / T. Agné in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 44, N° 4/2007 (08-09/2007)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 44, N° 4/2007 (08-09/2007) . - p. 222-225 Titre : Sanitary ware with easy cleaning and/or antibacterial properties Type de document : texte imprimé Auteurs : T. Agné, Auteur Année de publication : 2007 Article en page(s) : p. 222-225 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antibactériens Energie de surface Matériaux céramiques Nettoyage Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : When the sanitary ware "ceramicplus" was launched it was one of the first product in consumer market that offered a surface based on nanotechnology. "ceramicplus" is a ceramic material that is modified by sol-gel methods, the so called wet-chemical nanotechnology thus creating a material of very low surface energy which results in a particularly dirt-repellent and easy-care surface. A further innovative surface is called "activecare". This ceramic glaze contains small quantities of antibacterial silver ions which prevent the build-up of bacteria and ensures hygienic cleanliness. Independent tests by renowned research institutes have verified the properties and long-term effect of "ceramicplus" and "activecare". Because of its water- and dirtrepellent properties "ceramicplus" requires minimum care without influencing the established good properties typical of ceramic materials. The roughness and hardness of ceramicplus is not significantly different from those of conventional ceramic glaze for sanitary ware. Scrubbing tests have proven that only the long-run use of highly abrasive cleaning agents – like scouring powder – may scratch the surface and impair the properties of "ceramicplus" as well as conventional ceramics. Thanks to the easy-care properties of these functionally modified ceramic surfaces such aggressive cleaning agents are not required for cleanliness. DOI : 10.3139/113.100342 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3209 [article]

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Synthesis and characterization of a series of novel anionic fumaric polymerizable surfactants / M. Zhu in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 44, N° 4/2007 (08-09/2007)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 44, N° 4/2007 (08-09/2007) . - p. 226-229 Titre : Synthesis and characterization of a series of novel anionic fumaric polymerizable surfactants Type de document : texte imprimé Auteurs : M. Zhu, Auteur ; Z. Li ; H. Liu, Auteur ; Y. Sun, Auteur ; W. Qiao, Auteur Année de publication : 2007 Article en page(s) : p. 226-229 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Concentration micellaire critique Micelles Polymérisation Surfactants réactifs -- Synthèse Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : A series of novel anionic fumaric polymerizable surfactants with different lengths of carbon chains (C8–C14) were synthesized. The chemical structure of the surfactants was confirmed by 1H NMR, IR and MS. The values of critical micellar concentration (cmc) and gamma-cmc of the surfactants were determined. The surface properties of this series of designed polymerizable surfactants show their potential application in the emulsion polymerization to improve the stability of the latices and water sensitivity of the films. DOI : 10.3139/113.100343 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3210 [article]

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Interfacial tensions, partition coefficients, and interfacial eelasticities : measures for emulsion stability ? / N. Buchavzov in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 44, N° 4/2007 (08-09/2007)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 44, N° 4/2007 (08-09/2007) . - p. 230-238 Titre : Interfacial tensions, partition coefficients, and interfacial eelasticities : measures for emulsion stability ? Type de document : texte imprimé Auteurs : N. Buchavzov, Auteur ; F. Ravera, Auteur ; S. Hess, Auteur ; Y. Liu, Auteur ; U. Steinbrenner, Auteur ; C. Stubenrauch, Auteur Année de publication : 2007 Article en page(s) : p. 230-238 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Coefficient de partage (chimie) Emulsions -- Stabilité Rhéologie Tension superficielle Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : In this study the interfacial as well as the surface tensions, the partition coefficients Kp, the interfacial elasticities, and the stabilities of o/w-emulsions of the same systems were measured and compared to find a quantitative correlation which can help to control the emulsion stability. The systems in question contain water, paraffin oil and one of four non-ionic technical surfactants commonly used as emulsifiers. While a clear correlation between emulsion stability and equilibrium interfacial tension was found, the different emulsifying capacities cannot be explained by the partition coefficients Kp or the surface tension. However, combining the Kp results with the surface tension data allows us to estimate which emulsifier is more effective in solubilising a given amount of dispersed phase. Another method to classify emulsifiers is to carry out interfacial rheology measurements over a frequency range as broad as possible. Again a clear correlation between interfacial rheology and emulsifying capacity was found. This correlation, however, was restricted to surfactants of the same class. No correlation between interfacial rheology and emulsifying capacity could be found for emulsifiers of different molecular structure. DOI : 10.3139/113.100344 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3211 [article]

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