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Thermophysical properties and proton transport mechanisms of trialkylammonium and 1-Alkyl-1H-imidazol-3-ium protic ionic liquids / Janice L. Lebga-Nebane in Industrial & engineering chemistry research, Vol. 51 N° 43 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 14084-14098 Titre : Thermophysical properties and proton transport mechanisms of trialkylammonium and 1-Alkyl-1H-imidazol-3-ium protic ionic liquids Type de document : texte imprimé Auteurs : Janice L. Lebga-Nebane, Auteur ; Simon E. Rock, Auteur ; Joshua Franclemont, Auteur Année de publication : 2013 Article en page(s) : pp. 14084-14098 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Ionic  liquid  Transport  process Résumé : We investigated the thermophysical and electrochemical properties of eight model protic ionic liquids (PILs) primarily because of our interest in their proton conductivity and low volatility. The chemical structures of the cations (ammonium vs imidazolium) and anions (mesylate vs triflate) were found to strongly govern properties such as density, viscosity, ionic conductivity, thermal and electrochemical stability, and phase transition behaviors. Structure-property relations were analyzed on the basis of charge delocalization, cation π-stacking, van der Waals interactions of alkyl tails, and hydrogen bonding interactions between cations and anions. The diffusion coefficients of the free proton, the cation, and the anion were determined by using NMR spectroscopy, and were used to differentiate between the vehicular and Grotthuss mechanisms of diffusion of protons. A correlation, based on the Sutherland―Einstein equation, was developed to predict ionic conductivity by using the room temperature molar volume and the VFT equation for viscosity. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26593336 [article] Thermophysical properties and proton transport mechanisms of trialkylammonium and 1-Alkyl-1H-imidazol-3-ium protic ionic liquids [texte imprimé] / Janice L. Lebga-Nebane, Auteur ; Simon E. Rock, Auteur ; Joshua Franclemont, Auteur . - 2013 . - pp. 14084-14098. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 43 (Octobre 2012) . - pp. 14084-14098 Mots-clés : Ionic  liquid  Transport  process Résumé : We investigated the thermophysical and electrochemical properties of eight model protic ionic liquids (PILs) primarily because of our interest in their proton conductivity and low volatility. The chemical structures of the cations (ammonium vs imidazolium) and anions (mesylate vs triflate) were found to strongly govern properties such as density, viscosity, ionic conductivity, thermal and electrochemical stability, and phase transition behaviors. Structure-property relations were analyzed on the basis of charge delocalization, cation π-stacking, van der Waals interactions of alkyl tails, and hydrogen bonding interactions between cations and anions. The diffusion coefficients of the free proton, the cation, and the anion were determined by using NMR spectroscopy, and were used to differentiate between the vehicular and Grotthuss mechanisms of diffusion of protons. A correlation, based on the Sutherland―Einstein equation, was developed to predict ionic conductivity by using the room temperature molar volume and the VFT equation for viscosity. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26593336