Liquid Interface Functionalized by an Ion Extractant: The Case of Winsor III Microemulsions
| Autor: | Caroline Bauer, Olivier Diat, Pierre Bauduin, Thomas Zemb |
|---|---|
| Přispěvatelé: | Ions aux Interfaces Actives (L2IA), Institut de Chimie Séparative de Marcoule (ICSM - UMR 5257), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Tri ionique par les Systèmes Moléculaires auto-assemblés (LTSM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Dodecane
Inorganic chemistry 02 engineering and technology 010402 general chemistry 01 natural sciences Ion n-octyl-β-glucopyranoside (C8G1) chemistry.chemical_compound Colloid 020401 chemical engineering Electrochemistry salt General Materials Science Microemulsion [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] 0204 chemical engineering Solubility Spectroscopy Alkyl chemistry.chemical_classification Chromatography Surfaces and Interfaces Condensed Matter Physics microemulsion Spent nuclear fuel 0104 chemical sciences Phase diagram chemistry Energy source [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft] tributylphosphate (TBP) |
| Zdroj: | Langmuir Langmuir, American Chemical Society, 2011, 27 (5), pp.1653-1661. ⟨10.1021/la104005x⟩ Langmuir, 2011, 27 (5), pp.1653-1661. ⟨10.1021/la104005x⟩ |
| ISSN: | 0743-7463 1520-5827 |
| DOI: | 10.1021/la104005x⟩ |
| Popis: | International audience; The present work shows for the first time that tributylphosphate (TBP), the major ion extractant used in thereprocessing of spent nuclear fuel, acts efficiently as a cosurfactant in the formation of three-phase microemulsions.The system is composed of water, dodecane, TBP, and an extremely hydrophilic sugar surfactant, n-octyl-β-glucoside.The investigation of the three-phase region (Winsor III), the so-called “fish-cut” diagrams, revealed that TBP exhibitscosurfactant behavior comparable to that of classical cosurfactants n-pentanol and n-hexanol. Upon increasing thecosurfactant/surfactant molar ratio, TBP appears to be more efficient than single-chain alcohols in raising thespontaneous curvature of the adsorbed surfactant film toward oil. This is a direct consequence of the different lateralpacking of TBP and n-pentanol or n-hexanol in the mixed surfactant film, with TBP having three alkyl chains and so ahigher hydrophobic volume than those n-alcohols. This property is underlined by the interfacial film composition, whichis determined by the chemical analysis of the excess phases. It gives a surfactant to cosurfactant molar ratio of 1:1 forTBP and 1:3 for n-hexanol. Moreover, the local microstructure of the microemulsion becomes dependent on theaddition of salt when n-alcohol is replaced by TBP. A specific salt effect is also observed and rationalized in terms of thecomplexing property of TBP and Hofmeister’s effects. Treatment of the small-angle neutron scattering (SANS) datagives access to (i) the length scales characterizing the microemulsions (i.e., the persistence length, ξ, and aqueous ororganic domain sizes, D*) and (ii) the specific surface, Σ. It results that a subtle change is highlighted in the TBPmicroemulsion structure, in terms of connectivity, according to the type of salt added. |
| Databáze: | OpenAIRE |
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