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Biosurfactants – Exotic specialties or ready for application ? / M. Dreja in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 1 (01-02/2012)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 1 (01-02/2012) . - p. 10-17 Titre : Biosurfactants – Exotic specialties or ready for application ? Type de document : texte imprimé Auteurs : M. Dreja, Auteur ; I. Vockenroth, Auteur ; N. Plath, Auteur Année de publication : 2012 Article en page(s) : p. 10-17 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biosurfactants Détergents Durée de vie (Ingénierie) Mouillage (chimie des surfaces) Tension superficielle Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Surfactants are the most important ingredients in laundry detergents, hand dish washing liquids and shampoos. It is a major challenge for the industry today to identify alternative materials that are biodegradable, based on renewable resources and that show reasonable cost-performance effectiveness. Biosurfactants are an emerging class of surfactants produced by microorganisms in processes usually running at low temperatures and without large amounts of waste or by-products, therefore complying with the rules of green chemistry and potentially resulting in a lower carbon footprint than conventional surfactants. We show in our work which biosurfactants can meet or even surpass conventional surfactants today when it comes to properties like interfacial tension reduction and wetting. Taking into account that further optimization and tailoring of materials, unique physicochemical properties and efficient production processes are within reach, the future perspectives for the broader use of biosurfactants are bright. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13306 [article]

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Synthesis and interfacial properties of novel imidazoline gemini surfactants / W. Li in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 1 (01-02/2012)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 1 (01-02/2012) . - p. 18-2 Titre : Synthesis and interfacial properties of novel imidazoline gemini surfactants Type de document : texte imprimé Auteurs : W. Li, Auteur ; H. Tian, Auteur ; X. Zhou, Auteur Année de publication : 2012 Article en page(s) : p. 18-2 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Nanoparticules Surfactants -- Synthèse Tags : 'Surfactants  gemini'  Imidazole  'Propriétés  interfaciales'  Synthèse  Nanomatériaux Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Two novel imidazoline gemini surfactants quaternary ammonium salts of di(2-undecyl (heptadecyl)-1-formyl aminoethyl imidazoline) hexanediamine (SUAEIHDI/SHAEIHDI) were synthesized in this article, and their interfacial properties were studied. It was found that SUAEIHDI had a higher CMC value than SHAEIHDI in distillated water at constant temperature (12 ± 2) °C, indicating that it was easier for SHAEIHDI to form micelles in water. The symmetrical molecular structure of SUAEIHDI/SHAEIHDI is composed of lipophilic group and hydrophilic group comprising many active elements i.e. O, N and two imidazoline rings. The novel imidazoline gemini surfactants can be viewed as block-like copolymers, whose surface-modifying effects on nanomaterials are promising. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Synthesis and characterization of imidazoline gemini surfactants - Measurement of the surface tension - RESULTS AND DISCUSSION : FT-IR characterization - Interfacial properties of SUAEIHDI and SHAEIHDI - Adsorption isotherms of SUAEIHDI and SHAEIHDI - Structure-property relationship and potential application of SUAEIHDI/SHAEIHDI DOI : 10.3139/113.110159 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13307 [article]

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Two-phase titration method for cationic surface active agents determination with use of 5-(3-Bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7hindolo[1,2-a]quinolinium perchlorate dye / M. Gasiorowska in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 1 (01-02/2012)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 1 (01-02/2012) . - p. 23-25 Titre : Two-phase titration method for cationic surface active agents determination with use of 5-(3-Bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7hindolo[1,2-a]quinolinium perchlorate dye Type de document : texte imprimé Auteurs : M. Gasiorowska, Auteur ; Elwira Katarzyna Wroblewska, Auteur Année de publication : 2012 Article en page(s) : p. 23-25 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cations Pigments Solvatochromisme Surfactants Volumétrie (chimie analytique) Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The direct two-phase titration method with use of solvatochromic dye, i.e. 5-(3-bromo-4-hydroxy-5-methoxyphenyl)-7,7-dimethyl-7H-indolo[1,2-a]quinolinium perchlorate (1) for cationic surfactants determination is presented which is the modification of an earlier described procedure for anionic surface active substances detection. The method was tested on standard solution of benzethonium chloride (cationic detergent) which enables to estimate its accuracy as well as on few commercially available products to verify its utility. The influence of pH value of the probe on the titration endpoint determination was discussed and a simple solution of this problem has been proposed. Note de contenu : - EXPERIMENTAL : Chemicals - Commercial products - Procedure - RESULTS AND DISCUSSION : Test of the method - Determination of cationic surface active agents in commercial products Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13308 [article]

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Reduction of methylene blue by ascorbic acid : kinetic and thermodynamic aspects / H. J. Y. El-Aila in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 1 (01-02/2012)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 1 (01-02/2012) . - p. 26-31 Titre : Reduction of methylene blue by ascorbic acid : kinetic and thermodynamic aspects Type de document : texte imprimé Auteurs : H. J. Y. El-Aila, Auteur Année de publication : 2012 Article en page(s) : p. 26-31 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bleu de méthylène Cinétique chimique Ions ascorbate Micelles Réduction (chimie) Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : This article reports the reduction of methylene blue (MB) by ascorbic acid (H2As) in basic aqueous and micellar solutions. Ascorbate ion (As2–) is found to be an effective reducing agent for the decolorization of methylene blue under ambient condition. Effects of salting-in and salting-out agents have been investigated for real-time application in the reduction process. The salting-in agent urea has been found to uniquely enhance the rate of the reduction of MB by As2– in the presence of micelles. Detailed kinetic and thermodynamic aspects have been considered to realize the interaction between methylene blue and ascorbate ion. Kinetic studies revealed that the reaction follows pseudo first order reaction kinetics. Note de contenu : - EXPERIMENTAL : Materials and methods - Kinetics and instruments - RESULTS AND DISCUSSION : Reduction of methylene blue by ascorbate ion in aqueous solution - Micellar catalysis - Effect of temperature - Effect of salting-in and salting-out agent Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13309 [article]

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Investigating the activity of zirconia as a catalyst and a support for noble metals, in green oxidation of cyclohexane / M. Sadiq in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 1 (01-02/2012)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 1 (01-02/2012) . - p. 32-36 Titre : Investigating the activity of zirconia as a catalyst and a support for noble metals, in green oxidation of cyclohexane Type de document : texte imprimé Auteurs : M. Sadiq, Auteur ; S. Alam, Auteur ; F. Mabood, Auteur ; F. K. Bangash, Auteur ; M. Ilyas, Auteur Année de publication : 2012 Article en page(s) : p. 32-36 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composés organiques volatils -- Oxydation Cyclohexane -- Oxydation liquides Surfactants Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Green oxidation of cyclohexane by molecular oxygen was carried out over ZrO2 and noble metals (Pd and Pt) supported on zirconia in solvent free conditions. Studies have been carried out in a typical three-necked batch reactor. Reaction products were identified by GC and UV spectrophotometer. Reaction rates were determined as a function of temperature, partial pressure of oxygen, amount of catalyst, volume of reactants, agitation and reaction duration. The agitation effect and activation energy revealed the absence of mass transfer resistance. Experimental results unveiled the effect of morphology of ZrO2 on catalysis. 1.0 wt.% noble metal/ZrO2(m) was found more selective for cyclohexanol production at low temperature, agitation 900 rpm and partial pressure of 101.325 KPa while at high temperature cyclohexanol was further oxidized to cyclohexanone. Comparison of Pt/ZrO2 and Pd/ZrO2 catalysts was made on the basis of reactivity and selectivity. Catalysts were characterized by using BET surface area and pore size analyzer, XRD and SEM. To conclude shortly, for the oxidation of cyclohexane, platinum or palladium supported on zirconia are selective, recyclable and could behave as truly heterogeneous catalysts. Note de contenu : - EXPERIMENTAL : General - Preparation of catalyst - General procedure for oxidation of cyclohexane - RESULTS AND DISCUSSION : Characterization of catalyst - Oxidationof cyclohexane - Optimal conditions for catalytic activity Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13310 [article]

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Investigating the catalytic activity of monoclinic zirconia ; oxidation of benzyl alcohol in aqueous medium at mild conditions / M. Sadiq in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 1 (01-02/2012)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 1 (01-02/2012) . - p. 37-42 Titre : Investigating the catalytic activity of monoclinic zirconia ; oxidation of benzyl alcohol in aqueous medium at mild conditions Type de document : texte imprimé Auteurs : M. Sadiq, Auteur ; M. Ilyas, Auteur ; S. Alam, Auteur Année de publication : 2012 Article en page(s) : p. 37-42 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alcool benzylique -- Oxydation Benzoïque, Acide Catalyse Eaux usées -- Epuration Surfactants Zirconium Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The oxidation/degradation of benzyl alcohol in artificially contaminated water under atmospheric pressure by molecular oxygen/air over ZrO2(m) catalyst was investigated. Monoclinic phase ZrO2 was synthesized and characterized by modern techniques. Oxidation of benzyl alcohol in aqueous medium was carried out in a typical three necked double walled batch reactor equipped with thermometer and condenser. The rate of oxidation was affected by different reaction parameters such as speed of agitation, catalyst loading, temperature, concentration of substrate solution (46.3–185 mmol/L) and partial pressure of oxygen. Major products were detected with GC and UV spectrophotometer. Optimal conditions were setup for better catalytic activity of ZrO2(m). To sum up, catalytic oxidation of benzyl alcohol in aqueous medium by ZrO2(m) is a useful and cheaper method for the conversion of benzyl alcohol to valuable products as well as for the removal of benzyl alcohol from industrial waste water. Note de contenu : - EXPERIMENTAL : Chemicals - Typical procedure for catalyst preparation - Catalytic test and analysis - RESULTS AND DISCUSSION : Characterization of catalyst - Oxidation alcohol in aqueous medium - Effects of different parameters Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13311 [article]

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Synthesis and characterization of mesoporous alumina-zirconia as catalyst support for suzuki coupling reaction / J. Ji in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 1 (01-02/2012)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 1 (01-02/2012) . - p. 43-47 Titre : Synthesis and characterization of mesoporous alumina-zirconia as catalyst support for suzuki coupling reaction Type de document : texte imprimé Auteurs : J. Ji, Auteur ; K. Zhang, Auteur ; Y. Qin, Auteur ; Y. Kong, Auteur ; S. Li, Auteur ; Y. Wang, Auteur Année de publication : 2012 Article en page(s) : p. 43-47 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alumine Caractérisation Composés inorganiques -- Synthèse Copolymères séquencés Matériaux mésoporeux Réaction de couplage Surfactants Zirconium Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : One pot facile synthesis of ordered mesoporous alumina-supported zirconia with high thermal stability and large pore sizes by evaporation-induced method was systematically investigated. The strategy based on a sol-gel process associated with nonionic triblock copolymers PPO-PEO-PPO as templates in ethanolic solution. Small-angle XRD, TEM, and nitrogen adsorption and desorption results showed that these composites possessed an ordered 2D hexagonal mesostructure, resisted to high temperature up to 1000°C, and had large surface areas and narrow poresize distributions. Loaded with palladium, the mesoporous alumina-zirconia composite exhibited high catalytic activity in Suzuki coupling of 2-bromotoluene with phenylboronic acid. Note de contenu : - EXPERIMENTAL : Materials - Synthesis - Characterizations - RESULTS AND DISCUSSION : Preparation and characterization of mesoporous Al2O3-ZRO2 supports - Catalysis activity of Pd/Al2O3-ZRO2 catalyst Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13323 [article]

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A new place setting – Consumer-relevant measuring unit for domestic dishwashers / A. Brückner in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 1 (01-02/2012)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 1 (01-02/2012) . - p. 48-56 Titre : A new place setting – Consumer-relevant measuring unit for domestic dishwashers Type de document : texte imprimé Auteurs : A. Brückner, Auteur ; M. Schneider, Auteur ; R. Stamminger, Auteur Année de publication : 2012 Article en page(s) : p. 48-56 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Consommateurs -- Préférences Lave-vaisselle Tests d'efficacité Tags : 'Lave-vaisselle'  'Tests  performance'  Étalonnage  'Comportement  consommateur'  Amménagement  endroit'  'Technologie  ménage' Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : This study summarises the possible, necessary and recommended steps to align consumer behaviour and the standard place setting used for performance and consumption measurements of domestic dishwashers. The diversity and amount of load items, the composition of the dish materials and the amount of soiling in real life differ from the standard place setting. Through the analysis of secondary data regarding the dishware cleaned in household dishwashers, the development of a new, more consumer relevant place setting was possible. Apart from a reduction of the total amount of load items, new materials and items were introduced. The durability and availability of the dishes has been guaranteed and reproducible and differentiating soiling for the new dish items has been developed. Although laboratory tests revealed that the new place setting caused slightly different cleaning results, it still delivers differentiable results concerning the performance parameters of dishwashers. Finally, it reflects the actual usage of a dishwasher in the household much better than the current place setting, and standard test results may gain in importance for the consumer. Note de contenu : - INTRODUCTION : Labelling and testing - Usage of a dishwasher under household conditions - Materials and items cleaned in a household dishwasher - AIM - METHODS : Development of a consumer-relevant place setting - Concept of the new items - Concept of the new soiling - Parameters for comparative tests with the current and the new place setting - RESULTS : Development of a consumer-relevant place setting - Concept of the new items - Concept of the new soiling Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13324 [article]

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Minimum protocol for comparative detergent performance testing “detergent testing” A.I.S.E. working group / R. Lodewick in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 1 (01-02/2012)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 1 (01-02/2012) . - p. 57-60 Titre : Minimum protocol for comparative detergent performance testing “detergent testing” A.I.S.E. working group Type de document : texte imprimé Auteurs : R. Lodewick, Auteur ; E. S. Krijnen, Auteur ; O. Chevalier, Auteur ; Fred Schambil, Auteur ; D. Nickel, Auteur ; A. Crestana, Auteur ; L. Spadoni, Auteur Année de publication : 2012 Article en page(s) : p. 57-60 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Détergents Tests comparatifs Tests d'efficacité Tags : 'Protocole  minimum  essai'  'Test  performance  comparatif'  Détergents  'Exécution  première'  'Seconde  exécution' Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : In this paper a new protocol to support comparative testing of European laundry detergents is described. This protocol has been developed by A.I.S.E., the International Association for Soaps, Detergents and Maintenance products, to assess the primary (i.e., stain removal) and key secondary performance (whiteness, colour safety and colour transfer) of Household Laundry Detergents and Laundry Additives. The main purpose of designing and supporting a minimum test protocol across A.I.S.E. members and external stakeholders has been to improve the available comparative testing methodologies, while it isnotintended to become a standard methodology in the detergent industry. This was carried out by setting minimum requirements for a reliable comparison of detergent quality which is particularly important for test institutes and consumer organisations running comparative performance tests. Note de contenu : - THE PROTOCOL AND ITS KEY PRINCIPLES : Stain set and body soil - Temperature - Washing machines and ballast load - General recommendations - THE STAIN SET - INSTRUMENTAL EVALUATION OF THE RESULTS : Stain removal - Whiteness - Colour maintenane (oxidative bleach damage) and dye transfer - Summary of the recommended test conditions - FUTURE DEVELOPMENTS Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13325 [article]

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Biosurfactants, new ingredients and formulations, sustainability, forum for innovations / Hermann G. Hauthal in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 1 (01-02/2012)  

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 1 (01-02/2012) . - p. 68-74 Titre : Biosurfactants, new ingredients and formulations, sustainability, forum for innovations Type de document : texte imprimé Auteurs : Hermann G. Hauthal, Auteur Année de publication : 2012 Article en page(s) : p. 68-74 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biosurfactants Détergents Durée de vie (Ingénierie) Microémulsions Miniémulsions Mousse (chimie) Index. décimale : 668.1 Agents tensioactifs : savons, détergents Note de contenu : - Academia-industry Cooperation : Sugar surfactants - Biosurfactants, hybrid polymers - Microemulsions, miniemulsions, foam films - Detergents and cleansers - Sustainability (GDCh/LUV Conference) - Surfactants for natural cosmetic, phase behavior - Forum for innovations En ligne : http://www.tsd-journal.com/web/archiv/get_doc_free.asp?url=get_doc_free.asp&bin_ [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13326 [article]

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