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Conductivity measurements as a method for studying ionic technical grade surfactants / E. Carey in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 45, N° 3/2008 (05-06/2008)
[article]
Titre : Conductivity measurements as a method for studying ionic technical grade surfactants Type de document : texte imprimé Auteurs : E. Carey, Auteur ; C. Stubenrauch, Auteur ; S. R. Patil, Auteur Année de publication : 2008 Article en page(s) : p. 120-125 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Conductivité ionique
Micelles
Surfactants
Tensions (chimie)Tags : Ionic technical grade surfactant Specific conductivity Surface tension Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The critical micellar concentrations (cmc) of cationic alkyltrimethylammonium bromides (C10TAB–C16TAB) and of anionic alkyl sulfates (SDS, technical grade Sulfopon 12G and Sulfopon 1214G) were determined using specific conductivity and surface tension measurements. While the cationic surfactants were purified, the anionic surfactants were used as received. In the former case, surface tension and conductivity measurements lead to the same cmc values. In the latter case, measuring the specific conductivities (bulk property) proved to be superior compared to measuring the surface tensions (surface property) because the presence of highly surface active impurities creates a pronounced minimum in the surface tension isotherm, which makes it impossible to determine an accurate value for the cmc. On the other hand, these impurities do not influence the conductivities, i.e. that the conductivities can be used to determine cmc values of impure and technical grade ionic surfactants, respectively. Moreover, an evaluation of the specific conductivities allows for the determination of the degree of micelle ionization (alpha) of the ionic surfactant solutions and thus provides additional useful information. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3044
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 45, N° 3/2008 (05-06/2008) . - p. 120-125[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 010305 - Périodique Bibliothèque principale Documentaires Disponible Corrosion protective poly(aniline-co-o-anisidine) coatings onmild steel / Pritee M. Raotole in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 4 (07/2015)
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Titre : Corrosion protective poly(aniline-co-o-anisidine) coatings onmild steel Type de document : texte imprimé Auteurs : Pritee M. Raotole, Auteur ; Pankaj Koinkar, Auteur ; Bhavana Joshi, Auteur ; S. R. Patil, Auteur Année de publication : 2015 Article en page(s) : p. 757-766 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique.
L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1.
C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple.
Anticorrosion
Conducteurs organiques
Copolymérisation
Electrochimie organique
Métaux -- Revêtements protecteurs
VoltampérométrieIndex. décimale : 667.9 Revêtements et enduits Résumé : Syntheses of corrosion protective poly(aniline-co-o-anisidine) (PAOA) coatings were carried out on mild steel by the electrochemical copolymerization of aniline with o-anisidine under cyclic voltammetry conditions. An aqueous salicylate solution was used as the supporting electrolyte for the synthesis of PAOA coatings on mild steel. These coatings were characterized with cyclic voltammetry, ultraviolet–visible absorption spectroscopy, Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectroscopy (NMR), and scanning electron microscopy. The FTIR and 1H-NMR spectroscopy studies reveal that during copolymerization of aniline and o-anisidine, there are more o-anisidine units than aniline units in PAOA copolymer. The corrosion protection offered by PAOA coatings to mild steel was investigated in aqueous 3% NaCl solutions using the potentiodynamic polarization technique. The results of the potentiodynamic polarization measurements showed that the PAOA coatings provided more effective corrosion protection to mild steel than the respective homopolymers. The corrosion rate was observed to be dependent on the feed ratio of o-anisidine used for synthesis of the copolymer coatings. Note de contenu : - EXPERIMENTAL PROCEDURE : Materials - Substrate preparation - Electrochemical synthesis - PAOA copolymer coatings on mild steel - Characterization of the coatings - Study of corrosion protection performance
- RESULTS AND DISCUSSION : PAOA copolymer coatings on mild steel - FTIR spectroscopy results - NMR spectroscopy results - UV-visible absorption spectroscopy results - SEM results - Evaluation of corrosion protection performance - Open circuit potentialDOI : 10.1007/s11998-015-9669-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9669-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24410
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 4 (07/2015) . - p. 757-766[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17366 - Périodique Bibliothèque principale Documentaires Disponible