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Biosurfactant in planar chromatography of transition metal ions : mixed micelles activated separations / A. Moheman in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 4/2011 (07-08/2011)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 4/2011 (07-08/2011) . - p. 275-280 Titre : Biosurfactant in planar chromatography of transition metal ions : mixed micelles activated separations Type de document : texte imprimé Auteurs : A. Moheman, Auteur ; A. Husain, Auteur ; K. S. Siddiqi, Auteur Année de publication : 2011 Article en page(s) : p. 275-280 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : 'Chromatographie  Planaire'  Biosurfactant  'Ions  métaux  transition'  Souillure  Cellulose Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Sodium deoxycholate (a biosurfactant) in planar chromatography has been used to investigate the separation and migration behavior of transition metal ions. The chromatographic system comprised of soil-cellulose (3:7, w/w) as stationary phase and mixed micellar solution (sodium deoxycholate-sodium dodecyl sulfate, 1.0% each in 1:1 ratio) containing M5-acetonitrile in 3:2 ratio (v/v) was identified as the best mobile phase for separation and migration of transition metal ions. The Rf value for the metals follows the order, Cu(II) (0.15) < Ag(I) (0.57) < Au(III) (0.91) which also happens to be the order of increasing atomic weight of the metal ions in the periodic group. The detection limit of Cu(II), Ag(I), and Au(III) was found to be 0.22, 1.48, and 7.76 μg zone–1 respectively. The proposed method is robust, sensitive, easy, and reproducible. It has been used for successful identification and separation of above mentioned cations in sample matrices. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11928 [article]

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Synthesis and properties of lactobionamide-based polysiloxane surfactant / L. Wang in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 4/2011 (07-08/2011)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 4/2011 (07-08/2011) . - p. 281-285 Titre : Synthesis and properties of lactobionamide-based polysiloxane surfactant Type de document : texte imprimé Auteurs : L. Wang, Auteur ; D.-L. Zhang, Auteur ; Z.-P. Du, Auteur ; G. Y. Wang, Auteur ; S.-J. Wang, Auteur ; Y. Cao, Auteur Année de publication : 2011 Article en page(s) : p. 281-285 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie des surfaces Concentration micellaire critique Lactobionamide Précipitation (chimie) Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Surfactants Tension superficielle Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : A lactobionamide-based polysiloxane surfactant (LBPS) with well-defined structure was prepared via a two-step method. Structure characterization of the LBPS was performed by Fourier Transform Infrared spectroscopy (FT-IR) and proton nuclear magnetic resonance (1H NMR). Surface activity and aggregation behavior in aqueous solution of the LBPS were investigated by surface tension measurements, dynamic light scattering (DLS) and negative-stain transmission electron microscopy (TEM). The results show that the critical micelle concentration (CMC) and surface tension (γCMC) at the CMC in aqueous solution of the LBPS are 7.7 mg · L–1 and 27.5 mN · m–1, respectively, and the surfactants can self-assemble into spherical micelles with diameters in the range from 30 to 250 nm. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11945 [article]

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Structural elucidation and surfactant properties of rhamnolipids synthesized by pseudomonas aeruginosa (ATCC 10145) on sweet water as carbon source and stabilization effect on foam produced by sodium lauryl sulfate / S. D. Wadekar in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 4/2011 (07-08/2011)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 4/2011 (07-08/2011) . - p. 286-292 Titre : Structural elucidation and surfactant properties of rhamnolipids synthesized by pseudomonas aeruginosa (ATCC 10145) on sweet water as carbon source and stabilization effect on foam produced by sodium lauryl sulfate Type de document : texte imprimé Auteurs : S. D. Wadekar, Auteur ; S. V. Patil, Auteur ; S. B. Kale, Auteur ; A. M. Lali, Auteur ; D. N. Bhowmick, Auteur ; Ashish Pratap Singh, Auteur Année de publication : 2011 Article en page(s) : p. 286-292 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biosurfactants Chromatographie en phase liquide Eau douce Emulsions -- Stabilité Mousse (chimie) Pseudomonas aeruginosa Spectrométrie de masse Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The interest in biosurfactant has increased considerably due to their large potential for industrial applications. Rhamnolipid is the simplest class of biosurfactants with well defined structure. The main obstacle in commercialization of biosurfactant especially rhamnolipids is the higher cost of the production that can be reduced by use of inexpensive carbon substrates like glycerol that is readily available from commercial fat-splitting process in the form of sweet water (up to 20% w/v) at very low cost. The composition and structure of various components in crude rhamnolipids synthesized by of Pseudomonas aeruginosa (ATCC 10145) on sweet water, were determined using TLC, HPLC and LC\MS. The crude product showed two distinct components having structure Rha2C10C10 and Rha2C10C12 at 85.45 wt.% and 14.55 wt.% respectively. The Rha2C10C10 was more efficient and effective in surface tension reduction up to 23.5 mN/m than other components. Crude rhamnolipids showed better emulsifying power than its individual components. The crude rhamnolipids showed better foam stability than sodium lauryl sulfate (SLS) at lower concentrations (0.05 to 0.002% w/v). It also enhanced and stabilized the foam produced by SLS at 0.01 to 0.025% of rhamnolipids. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11946 [article]

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Synthesis of bisphosphodiester surfactants derived from tetradecanol and different methylene chains as a spacer derived from a-ω-alkyl dibromides / P. Tyagi in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 4/2011 (07-08/2011)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 4/2011 (07-08/2011) . - p. 293-300 Titre : Synthesis of bisphosphodiester surfactants derived from tetradecanol and different methylene chains as a spacer derived from a-ω-alkyl dibromides Type de document : texte imprimé Auteurs : P. Tyagi, Auteur ; R. Tyagi, Auteur Année de publication : 2011 Article en page(s) : p. 293-300 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bisphosphodiester Composés amphiphiles Dispersions et suspensions Surfactants Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Bisphosphodiester surfactant is a name assigned to a family of synthetic amphiphiles possessing a hydrocarbon chain attached to another hydrocarbon chain via different methylene chains as a spacer derived from α-ω-alkyl dibromide (1,4-DBB, 1,6-DBH and 1,8-DBO). In the present study, a series of bisphosphodiester surfactants having C14 hydrophobic tail and different methylene chains as a spacer derived from α-ω-alkyl dibromide have been synthesized at 35 °C. The effect of reaction variables like temperature, duration and molar ratios of mono tetradecyl phosphate, tetramethyl ammonium hydroxide and spacer on the yield of bisphosphodiester surfactants has also been reported. Modern instrumental techniques viz. FT-IR, 1HNMR, and 13CNMR were utilized to characterize the functional groups presence in synthesized bisphosphodiester surfactants. Elemental analysis of synthesized bisphosphodiester surfactants was also carried out. Surface active properties viz. surface tension, interfacial tension, critical micelle concentration and aqueous properties viz. foaming stability, wetting ability, emulsifying ability and dispersing power of synthesized gemini surfactants were also determined. Among all synthesized bisphosphodiester surfactants IIIb had maximum anionic content of 78.9%; and showed highest foaming ability (70 ml), superior dispersing ability (45.7%), whereas IIIc showed low CMC values (0.00026 mmol/l); minimum surface tension and interfacial tension (37.3 mN/m and 31.6 mN/m) respectively. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11947 [article]

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Synthesis, characterization, and kinetic study of two new cationic surfactants / Mohammad Edrissi in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 4/2011 (07-08/2011)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 4/2011 (07-08/2011) . - p. 301-304 Titre : Synthesis, characterization, and kinetic study of two new cationic surfactants Type de document : texte imprimé Auteurs : Mohammad Edrissi, Auteur ; Meysam Soleymani, Auteur ; M. Asadian, Auteur Année de publication : 2011 Article en page(s) : p. 301-304 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Cinétique chimique Surfactants -- Synthèse Tags : 'Surfactants  cationiques'  'Chlorure  stéaryl  morpholinium'  palmitoyl  Synthèse Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Two new surfactants (stearoyl morpholinium chloride and palmitoyl morpholinium chloride) were synthesized in two steps. In the first step, chloride acids were reacted with morpholine salt for producing morpholinium normal penta decyl ketone and morpholinium normal hepta decyl ketone. In the second step, the obtained products were reacted with HCl to produce suitable surfactants. The synthesis products in each steps were analyzed by Nuclear magnetic resonance (NMR), Fourier transform infrared spectrometry (FTIR), and elemental analysis. Also, the kinetic of the reactions were investigated. It has been shown that the synthesis reaction of the first step, the low rate step, follows a first order for two surfactants. The properties of two surfactants were investigated for anti-static and surface tension reduction. It was found that the hydrocarbon chain length is the main factor which has an effect on the properties of surfactants. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11948 [article]

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Synthesis, characterization and surface activity of trioctyl hydroxyethyl ammonium chloride / Y.-L. Li in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 4/2011 (07-08/2011)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 4/2011 (07-08/2011) . - p. 305-307 Titre : Synthesis, characterization and surface activity of trioctyl hydroxyethyl ammonium chloride Type de document : texte imprimé Auteurs : Y.-L. Li, Auteur ; Q.-X. Li, Auteur ; L.-F. Zhi, Auteur ; M.-H. Zhang, Auteur Année de publication : 2011 Article en page(s) : p. 305-307 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Surfactants -- Synthèse Tags : 'Surfactant  cationique'  'Chlorure  ammonium  trioctyle  hydroxyéthyle'  'Oxyde  éthylène'  'Activité  surface' Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Trioctyl hydroxyethyl ammonium chloride was synthesized from trioctylamine, hydrochloric acid and ethylene oxide by a twostep process. The structure of the quaternary ammonium salt was characterized by FTIR and 1H NMR. The surface tension at the critical micelle concentration was measured to investigate the surface activity of it. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11949 [article]

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Physicochemical properties of cetyltributylphosphonium bromide in the presence of additives / D. Tikariha in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 4/2011 (07-08/2011)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 4/2011 (07-08/2011) . - p. 308-311 Titre : Physicochemical properties of cetyltributylphosphonium bromide in the presence of additives Type de document : texte imprimé Auteurs : D. Tikariha, Auteur ; K. K. Ghosh, Auteur Année de publication : 2011 Article en page(s) : p. 308-311 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : 'Surfactants  monomériques'  cationiques'  'Non-électrolyte'  'Thermodynamique  micellisation'  'Effets  additifs'  'Concentration  micellaire  critique' Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Physicochemical behavior of cetyltributylphosphonium bromide (CTBuPB) surfactant in presence of additives (urea, thiourea and sucrose) has been studied by conductometric measurement at 303–320 K. The critical micelle concentration (CMC) and degree of micellar ionization (α), increases with increasing concentration of additives (urea, thiourea and sucrose). The standard Gibbs free energy of micellization (ΔG0m), enthalpy of micellization (ΔH0m) and entropy of micellization, (ΔS0m), have been obtained by applying the mass action model. The free energy and enthalpy of micellization have found to be negative in all the systems. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11950 [article]

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Conductometry and thermodynamic study of micellization of cetyltrimethylammonium bromide in mixed solvents containing dilute electrolyte solutions / H. J. Y. El-Aila in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 4/2011 (07-08/2011)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 4/2011 (07-08/2011) . - p. 312-317 Titre : Conductometry and thermodynamic study of micellization of cetyltrimethylammonium bromide in mixed solvents containing dilute electrolyte solutions Type de document : texte imprimé Auteurs : H. J. Y. El-Aila, Auteur Année de publication : 2011 Article en page(s) : p. 312-317 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : Micellisation  'Concentration  micellaire  critique'  'Bromure  cétyltriméthyle  ammonium'  Diméthylsulfoxyde  Acétonitrile  Ion  Conductimétrie Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The critical micelle concentration (CMC) of Cetyltrimethyl ammonium bromide (CTAB) was determined conductometrically in binary mixtures of water + cosolvent at various temperatures and at low concentrations of sodium chloride, ranging from 0.0 to 2.4 × 10–2 M. Dimethylsulfoxide (DMSO) and acetonitrile (AN) were used as cosolvents added to water. The ability of NaCl to lower the CMC of CTAB in water was inhibited by DMSO and AN. Thermodynamic parameters of micellization ΔH0m, ΔS0m, and ΔG0m were evaluated according to the pseudo-phase model. The contribution of DMSO and AN in the micellization process of CTAB in aqueous electrolyte solutions were discussed in terms of the observed thermodynamic properties. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11951 [article]

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Preparations of novel flocculants and its applications in the paper-making wastewater / F. Zhao in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 4/2011 (07-08/2011)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 4/2011 (07-08/2011) . - p. 318-322 Titre : Preparations of novel flocculants and its applications in the paper-making wastewater Type de document : texte imprimé Auteurs : F. Zhao, Auteur ; J. L. He, Auteur Année de publication : 2011 Article en page(s) : p. 318-322 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : 'Polacrylamide  cationique'  'Monomère  fonctionnel'  Flocculant  'Eaux  usée  fabrication  papier' Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Functional monomer [N-(2,4,4-trimethylpentan-2-yl)acrylamide] was synthesized and characterized by MS and NMR. A series of high molecular weight cationic polyacrylamides were prepared with N-(2,4,4-trimethylpentan-2-yl)acrylamide, acrylamide and methacryloxyethyltrimethyl ammonium chloride by copolymerization using complex initiation systems as catalysts in aqueous solution. Then they used as flocculants to treat the paper-making wastewater. The removal of the colour and the chemical oxygen demand (COD) in the treated waste water samples were determined. Results showed that flocculants could efficiently remove the color and the COD. The overall color and COD removal efficiencies reached as high as 80% and 85%, respectively. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11952 [article]

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