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Bruckschlegel C, Pasquier C, Toquer G, Girard L, Odorico M, Lautru J, Diat O, Bauduin P. Toward Distinguishing between the Superchaotropic and Hydrophobic Characters of Nanometric-Sized Ions in Interaction with PEGylated Surfaces. J Phys Chem Lett 2024; 15:4229-4236. [PMID: 38634114 DOI: 10.1021/acs.jpclett.4c00710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/19/2024]
Abstract
In this study, we explore the superchaotropic effect of various polyoxometalate or boron cluster nano-ions on hydrophilic neutral surfaces. Nano-ions, characterized by low charge densities, exhibit strong adsorption on non-ionic hydrophilic surfaces like PEGylated micelles. This adsorption phenomenon was attributed to the enthalpically favorable dehydration of nano-ions, the so-called superchaotropic effect. Here, we investigate the adsorption of three nano-ions, α-SiW12O404-, α-PW12O403-, and B12I122-, with decreasing charge density or increasing superchaotropicity (or hydrophobicity), on hydrophilic solid surfaces, PEGylated gold nanoparticles, and PEGylated gold-coated quartz crystal. Solid surfaces are devoid of hydrophobic regions, enabling the study of the subtle nuance between hydrophobic and superchaotropic effects. Unlike adsorption on PEGylated micelles, the adsorption constant decreases with a reduced charge density, aligning with the well-established principle that hydrophobic ions do not adsorb on hydrophilic surfaces. This research improves our understanding of the subtle difference between superchaotropic and hydrophobic effects in nano-ion adsorption phenomena.
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Affiliation(s)
- Christoph Bruckschlegel
- Institute of Analytical Chemistry, Chemo- and Biosensors University of Regensburg, 93053 Regensburg, Germany
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, 30207 Bagnols sur Cèze Cedex, France
| | - Coralie Pasquier
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, 30207 Bagnols sur Cèze Cedex, France
| | - Guillaume Toquer
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, 30207 Bagnols sur Cèze Cedex, France
| | - Luc Girard
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, 30207 Bagnols sur Cèze Cedex, France
| | - Michael Odorico
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, 30207 Bagnols sur Cèze Cedex, France
| | - Joseph Lautru
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, 30207 Bagnols sur Cèze Cedex, France
| | - Olivier Diat
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, 30207 Bagnols sur Cèze Cedex, France
| | - Pierre Bauduin
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, 30207 Bagnols sur Cèze Cedex, France
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Micheau C, Ueda Y, Motokawa R, Bauduin P, Girard L, Diat O. Foam Flotation of Clay Particles Using a Bifunctional Amine Surfactant. Langmuir 2023. [PMID: 37503925 DOI: 10.1021/acs.langmuir.3c01213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 07/29/2023]
Abstract
Understanding clay flotation mechanisms has become a major concern because of the increasing level of environmental contamination of soil and ground water by heavy metals and radionuclides. Clays are often used as sorbents for extracting metals in indirect flotation processes but can function simultaneously as defoamers. However, how foam generation and stability depend on the molecular interactions between the clays and surfactant is still controversial. In the present study, an amine polyethoxylated surfactant was used as a bifunctional surfactant that collected clay particles and acted as a foaming agent in the flotation process. The pH conditions strongly affected the surfactant physicochemical properties, allowing the clay extraction efficiency to be tuned. The interfacial recovery factor of the clays almost reached 100% under acidic (pH < 6) and neutral (pH 6-10) conditions, whereas it was negative under alkaline conditions (pH > 10), contrary to expectations. To elucidate the mechanisms involved in the particle flotation process for each of the pH conditions, the bulk and foam phases were analyzed. The effects of electrostatic interactions between the solutes and multiscale structure on the clay extraction behavior were investigated by electrophoretic measurements, dynamic light scattering, small-angle neutron scattering, and image analysis. Based on these results, three flotation processes were found depending on pH range: surfactant foam fractionation at pH > 10; clay particle foam flotation at pH 6-10; and particle froth flotation at pH < 6.
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Affiliation(s)
- Cyril Micheau
- Materials Sciences Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - Yuki Ueda
- Materials Sciences Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - Ryuhei Motokawa
- Materials Sciences Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
| | - Pierre Bauduin
- Institut de Chimie Séparative de Marcoule, ICSM, CEA, CNRS, ENSCM, Univ Montpellier, BP 17171, Marcoule, 30207 Bagnols-sur-Cèze, France
| | - Luc Girard
- Institut de Chimie Séparative de Marcoule, ICSM, CEA, CNRS, ENSCM, Univ Montpellier, BP 17171, Marcoule, 30207 Bagnols-sur-Cèze, France
| | - Olivier Diat
- Institut de Chimie Séparative de Marcoule, ICSM, CEA, CNRS, ENSCM, Univ Montpellier, BP 17171, Marcoule, 30207 Bagnols-sur-Cèze, France
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Hohenschutz M, Dufrêche JF, Diat O, Bauduin P. Correction to "When Ions Defy Electrostatics: The Case of Superchaotropic Nanoion Adsorption". J Phys Chem Lett 2023:5235. [PMID: 37262125 DOI: 10.1021/acs.jpclett.3c01501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
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Chazapi I, Diat O, Bauduin P. Aqueous solubilization of hydrophobic compounds by inorganic nano-ions: An unconventional mechanism. J Colloid Interface Sci 2023; 638:561-568. [PMID: 36773518 DOI: 10.1016/j.jcis.2023.01.115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 01/19/2023] [Accepted: 01/23/2023] [Indexed: 01/27/2023]
Abstract
HYPOTHESIS Solubilization of hydrophobic compounds in water is commonly performed by using organic solubilizers such as hydrotropes, surfactants, co-solvents, and macrocycles to form host-guest complexes. 3,3'-commo-bis[closo-1,2-dicarba-3-cobaltadodecaborane] derivatives (COSANs) are fully inorganic and non-amphiphilic ionic boron clusters with nanometric size (nano-ions) showing superchaotropic properties as they strongly bind to neutral organic molecules. Therefore, we expect COSANs to act as solubilizers of sparingly water-soluble molecules, but with a mechanism different from all other organic solubilizers known so far. EXPERIMENTS The aqueous solubilization efficiency of COSANs towards butanol was evaluated by determining phase diagrams and comparing them to classical solubilizers. Nanostructuration of the mixture was studied using UV spectroscopy, small-angle X-ray, and neutron scattering with contrast variation. FINDINGS COSANs act as efficient aqueous solubilizers of medium-chain alcohols (0.6 < log P < 1.5). Unlike surfactants, COSAN is an efficient solubilizer in its monomeric state, at concentrations well below its critical aggregation concentration. Solubilization by COSAN takes place with a bi-dimensional anisotropic growth of COSAN/butanol co-assemblies, whereas solubilization by surfactant occurs via an isotropic swelling of micelles. Appealingly, COSANs/2-butanol co-assemblies efficiently solubilize more hydrophobic compounds with log P values up to around 6, offering new opportunities in many applied fields.
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Affiliation(s)
- Ioanna Chazapi
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Bagnols sur Cèze, France
| | - Olivier Diat
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Bagnols sur Cèze, France
| | - Pierre Bauduin
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Bagnols sur Cèze, France.
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Abstract
Nanometer-sized anions, like polyoxometalates and borate clusters, bind to nonionic hydrated matter driven by the chaotropic effect, which arises from the favorable dehydration of the ions. Herein, we evaluate the adsorption and activity coefficient of the superchaotropic Keggin polyoxometalate SiW12O404- (SiW) on nonionic surfactant (C8E4) micelles by modeling small-angle X-ray and neutron-scattering spectra. Neither hard sphere nor electrostatic repulsion models reproduce the experimental activity coefficient of adsorbed SiW ions on the micelles. However, the activity and binding of SiW on the micelles is well-described by a Langmuir adsorption isotherm. These results imply that adsorbed SiW ions are non-interacting and "create" around themselves adsorption sites on the micelle. The temperature dependence of the adsorption constant showed that the SiW adsorption is enthalpically driven and entropically unfavorable, in line with the typical chaotropic thermochemical signature. The adsorption enthalpy can be split into an electrostatic term and a water-recovery term to evaluate and qualitatively predict the superchaotropicity of a nanoion.
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Affiliation(s)
- Max Hohenschutz
- ICSM, CEA, CNRS, ENSCM, Univ. Montpellier, Marcoule, France, Centre de Marcoule, 30207 Bagnols-sur-Cèze, France
| | - Jean-François Dufrêche
- ICSM, CEA, CNRS, ENSCM, Univ. Montpellier, Marcoule, France, Centre de Marcoule, 30207 Bagnols-sur-Cèze, France
| | - Olivier Diat
- ICSM, CEA, CNRS, ENSCM, Univ. Montpellier, Marcoule, France, Centre de Marcoule, 30207 Bagnols-sur-Cèze, France
| | - Pierre Bauduin
- ICSM, CEA, CNRS, ENSCM, Univ. Montpellier, Marcoule, France, Centre de Marcoule, 30207 Bagnols-sur-Cèze, France
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Braun L, Hohenschutz M, Diat O, von Klitzing R, Bauduin P. Repulsive, but sticky - Insights into the non-ionic foam stabilization mechanism by superchaotropic nano-ions. J Colloid Interface Sci 2023; 641:437-448. [PMID: 36948099 DOI: 10.1016/j.jcis.2023.03.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 02/28/2023] [Accepted: 03/03/2023] [Indexed: 03/11/2023]
Abstract
HYPOTHESIS The superchaotropic Keggin polyoxometalate α-SiW12O404- (SiW) was recently shown to stabilize non-ionic surfactant (C18:1E10) foams owing to electrostatic repulsion that arises from the adsorption of SiW-ions to the foam interfaces. The precise mechanism of foam stabilization by SiW however remained unsolved. EXPERIMENTS Imaging and conductimetry were used on macroscopic foams to monitor the foam collapse under free drainage and small angle neutron scattering (SANS) at a given foam height allowed for the tracking of the evolution of film thickness under quasi-stationary conditions. Thin film pressure balance (TFPB) measurements enabled to quantify the resistance of single foam films to external pressure and to identify intra-film forces. FINDINGS At low SiW/surfactant ratios, the adsorption of SiW induces electrostatic repulsion within foam films. Above a concentration threshold corresponding to an adsorption saturation, excess of SiW screens the electrostatic repulsion that leads to thinner foam films. Despite screened electrostatics, the foam and single foam films remain very stable caused by an additional steric stabilizing force consistent with the presence of trapped micelles inside the foam films that bridge between the interfaces. These trapped micelles can serve as a surfactant reservoir, which promotes self-healing of the interface leading to much more resilient foam films in comparison to bare surfactant foams/films.
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Affiliation(s)
- Larissa Braun
- Soft Matter at Interfaces, Department of Physics, Technische Universität Darmstadt, Darmstadt, Germany
| | - Max Hohenschutz
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, France; RWTH Aachen University, Institute of Physical Chemistry, Landoltweg 2, 52074 Aachen, Germany
| | - Olivier Diat
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, France
| | - Regine von Klitzing
- Soft Matter at Interfaces, Department of Physics, Technische Universität Darmstadt, Darmstadt, Germany.
| | - Pierre Bauduin
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, France.
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Cot-Auriol M, Virot M, Dumas T, Diat O, Le Goff X, Moisy P, Nikitenko SI. Ultrasonically controlled synthesis of UO 2+x colloidal nanoparticles. Dalton Trans 2023; 52:2135-2144. [PMID: 36722900 DOI: 10.1039/d2dt03721a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Actinide colloids and nanoparticles (NPs) currently constitute a topic of strong interest due to their potential role in advanced nuclear energetics and the environmental migration of radioactivity. A better understanding of the physico-chemical properties of nanoscale actinide oxides requires robust synthesis approaches. In this work, UO2+x NPs were successfully prepared by sonochemistry from U(IV) solutions previously stabilised in a hydrochloric medium (20 kHz, 65 °C, Ar/(10%)CO). Colloidal suspensions were found to be composed of crystalline and spherical NPs showing a UO2-like structure and measuring 18.0 ± 0.1 nm (SAXS, HR-TEM and PXRD techniques). In comparison with the controlled hydrolysis approach used as a reference, sonochemistry appears to be a simple and original synthesis route providing larger, better defined and more crystalline UO2+x NPs with a narrower size distribution. These well-defined NPs offer new opportunities for the preparation of reference actinide materials devoted to fundamental, technological and environmental studies.
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Affiliation(s)
| | - Matthieu Virot
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France.
| | - Thomas Dumas
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France
| | - Olivier Diat
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France.
| | - Xavier Le Goff
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France.
| | - Philippe Moisy
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France
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Lamolinairie J, Dollet B, Bridot JL, Bauduin P, Diat O, Chiappisi L. Probing foams from the nanometer to the millimeter scale by coupling small-angle neutron scattering, imaging, and electrical conductivity measurements. Soft Matter 2022; 18:8733-8747. [PMID: 36341841 DOI: 10.1039/d2sm01252a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Liquid foams are multi-scale structures whose structural characterization requires the combination of very different techniques. This inherently complex task is made more difficult by the fact that foams are also intrinsically unstable systems and that their properties are highly dependent on the production protocol and sample container. To tackle these issues, a new device has been developed that enables the simultaneous time-resolved investigation of foams by small-angle neutron scattering (SANS), electrical conductivity, and bubbles imaging. This device allows the characterization of the foam and its aging from nanometer up to centimeter scale in a single experiment. A specific SANS model was developed to quantitatively adjust the scattering intensity from the dry foam. Structural features such as the liquid fraction, specific surface area of the Plateau borders and inter-bubble films, and thin film thickness were deduced from this analysis, and some of these values were compared with values extracted from the other applied techniques. This approach has been applied to a surfactant-stabilized liquid foam under free drainage and the underlying foam destabilization mechanisms were discussed with unprecedented detail. For example, the information extracted from the image analysis and SANS data allows for the first time to determine the disjoining pressure vs. thickness isotherm in a real, draining foam.
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Affiliation(s)
- Julien Lamolinairie
- Institut Max von Laue - Paul Langevin (ILL), 71 Avenue des Martyrs, 38042 Grenoble, France.
| | - Benjamin Dollet
- Université Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, France
| | | | - Pierre Bauduin
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France
| | - Olivier Diat
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France
| | - Leonardo Chiappisi
- Institut Max von Laue - Paul Langevin (ILL), 71 Avenue des Martyrs, 38042 Grenoble, France.
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Schmid P, Hohenschutz M, Graß X, Witzmann M, Touraud D, Diat O, Pfitzner A, Bauduin P. Counterion effect on α-Keggin polyoxometalates in water: The peculiar role of H+ on their salting-in effect and co-assembly with organics. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Foucaud Y, Dufrêche JF, Siboulet B, Duvail M, Jonchère A, Diat O, Vuilleumier R. Why local and non-local terms are essential for second harmonic generation simulation? Phys Chem Chem Phys 2022; 24:12961-12973. [PMID: 35580631 DOI: 10.1039/d1cp05437f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Second Harmonic Generation (SHG) today represents one of the most powerful techniques to selectively probe all types of interfaces. However, the origin of the SHG signal at a molecular level is still debated since the local dipole contribution, which is strongly correlated to the molecular orientation can be counterbalanced by non-local quadrupole contributions. Here, we propose a method to simulate the SHG signal of a model water/air interface from the molecular response of each contribution. This method includes both local and non-local terms, which are represented, respectively, by the dependency of the polarisability and hyperpolarisability upon the chemical environment of the molecule and by the bulk quadrupole response. The importance of both terms for the sound simulation of the SHG signals and their interpretation is assessed. We demonstrate that the sole dipole term is unable to simulate a SHG signal, even if the dependency of the hyperpolarisability on the local environment is considered. The inclusion of the bulk quadrupole contribution, which largely dominates the dipole contribution, is essential to predict the SHG response, although the accuracy of the prediction is increased when the dependency upon the local environment is considered.
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Affiliation(s)
- Yann Foucaud
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France.
| | | | | | - Magali Duvail
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France.
| | - Alban Jonchère
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France.
| | - Olivier Diat
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, Marcoule, France.
| | - Rodolphe Vuilleumier
- PASTEUR, Département de Chimie, Ecole normale supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France.
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Cot-Auriol M, Virot M, Dumas T, Diat O, Menut D, Moisy P, Nikitenko S. First observation of [Pu6(OH)4O4]12+ cluster during the hydrolytic formation of PuO2 nanoparticles using H/D kinetic isotope effect. Chem Commun (Camb) 2022; 58:13147-13150. [DOI: 10.1039/d2cc04990b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New insights are provided about the formation mechanism of PuO2 nanoparticles (NPs) by investigating an unprecedented kinetic isotope effect observed during their hydrolytic synthesis in H2O or D2O and attributed...
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Dumas T, Virot M, Menut D, Tamain C, Micheau C, Dourdain S, Diat O. Size and structure of hexanuclear plutonium oxo-hydroxo clusters in aqueous solution from synchrotron analysis. J Synchrotron Radiat 2022; 29:30-36. [PMID: 34985420 PMCID: PMC8733971 DOI: 10.1107/s1600577521012005] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Accepted: 11/10/2021] [Indexed: 06/01/2023]
Abstract
The size and shape of a water-soluble hexanuclear plutonium cluster were probed by combining synchrotron small-angle X-ray scattering (SAXS) and extended X-ray absorption fine structure (EXAFS). A specific setup coupling both techniques and dedicated to radioactive samples on the MARS beamline endstation at Synchrotron SOLEIL is described. The plutonium hexanuclear cores are well stabilized by the 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid ligands and this allows a good evaluation of the setup to probe the very small plutonium core. The results show that, in spite of the constrained conditions required to avoid any risk of sample dispersion, the flux and the sample environment are optimized to obtain a very good signal-to-noise ratio, allowing the detection of small plutonium aggregates in an aqueous phase. The structure of the well defined hexanuclear cluster has been confirmed by EXAFS measurements in solution and correlated with SAXS data processing and modelling. An iterative comparison of classical fit models (Guinier or sphere form factor) with the experimental results allowed a better interpretation of the SAXS signal that will be relevant for future work under environmentally relevant conditions.
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Affiliation(s)
- Thomas Dumas
- CEA, DES, ISEC, DMRC, Univ Montpellier, Marcoule, France
| | - Matthieu Virot
- ICSM, CEA, Univ Montpellier, CNRS, ENSCM, Bagnols sur Cèze, France
| | - Denis Menut
- Synchrotron SOLEIL, L’Orme des Merisiers Saint Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France
| | | | - Cyril Micheau
- ICSM, CEA, Univ Montpellier, CNRS, ENSCM, Bagnols sur Cèze, France
| | | | - Olivier Diat
- ICSM, CEA, Univ Montpellier, CNRS, ENSCM, Bagnols sur Cèze, France
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13
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Foucaud Y, Siboulet B, Duvail M, Jonchere A, Diat O, Vuilleumier R, Dufrêche JF. Deciphering second harmonic generation signals. Chem Sci 2021; 12:15134-15142. [PMID: 34909155 PMCID: PMC8612378 DOI: 10.1039/d1sc03960a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Accepted: 10/25/2021] [Indexed: 11/21/2022] Open
Abstract
Second harmonic generation (SHG) has emerged as one of the most powerful techniques used to selectively monitor surface dynamics and reactions for all types of interfaces as well as for imaging non-centrosymmetric structures, although the molecular origin of the SHG signal is still poorly understood. Here, we present a breakthrough approach to predict and interpret the SHG signal at the atomic level, which is freed from the hyperpolarisability concept and self-consistently considers the non-locality and the coupling with the environment. The direct ab initio method developed here shows that a bulk quadrupole contribution significantly overwhelms the interface dipole term in the purely interfacial induced second-order polarisation for water/air interfaces. The obtained simulated SHG responses are in unprecedented agreement with the experimental signal. This work not only paves the road for the prediction of SHG response from more complex interfaces of all types, but also suggests new insights in the interpretation of the SHG signal at a molecular level. In particular, it highlights the modest influence of the molecular orientation and the high significance of the bulk quadrupole contribution, which does not depend on the interface, in the total experimental response. Second harmonic generation is one of the most powerful techniques used to selectively probe interfaces of all types. The direct ab initio method developed here allows predicting the signal and highlights the importance of local and non-local effects.![]()
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Affiliation(s)
- Yann Foucaud
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM Marcoule France
| | | | - Magali Duvail
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM Marcoule France
| | - Alban Jonchere
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM Marcoule France
| | - Olivier Diat
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM Marcoule France
| | - Rodolphe Vuilleumier
- PASTEUR, Département de Chimie, Ecole Normale Supérieure, PSL University, Sorbonne Université, CNRS 75005 Paris France
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14
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Cot-Auriol M, Virot M, Micheau C, Dumas T, Le Goff X, Den Auwer C, Diat O, Moisy P, Nikitenko SI. Ultrasonically assisted conversion of uranium trioxide into uranium(vi) intrinsic colloids. Dalton Trans 2021; 50:11498-11511. [PMID: 34346448 DOI: 10.1039/d1dt01609a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Under oxidizing conditions, the corrosion of spent nuclear fuel may lead to the leaching of radionuclides including soluble uranyl-based species. The speciation of the generated chemical forms is complex and the related potential formation of colloidal species appears surprisingly poorly reported in the literature. Their formation could however contribute significantly to the mobility of radionuclides in the environment. A better knowledge in the speciation and reactivity of these species appears particularly relevant. This study describes the preparation and characterization of intrinsic uranium(vi) colloids from amorphous and crystalline UO3 in pure water assisted by 20 kHz ultrasound. In the presence of carbon monoxide preventing the sonochemical formation of hydrogen peroxide, ultrasonic treatment boosts the conversion of UO3 powder into (meta-)schoepite precipitates and yields very stable and notably concentrated uranium(vi) nanoparticles in the liquid phase. Using HR-TEM, SAXS and XAS techniques, we confirmed that the colloidal suspension is composed of quasi-spherical nanoparticles measuring ca. 3.8 ± 0.3 nm and exhibiting a schoepite-like crystallographic structure. The proposed method demonstrates the possible formation of environmentally relevant U(vi) colloidal nanoparticles appearing particularly interesting for the preparation of reference systems in the absence of added ions and capping agents.
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15
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Hohenschutz M, Grillo I, Dewhurst C, Schmid P, Girard L, Jonchère A, Diat O, Bauduin P. Superchaotropic nano-ions as foam stabilizers. J Colloid Interface Sci 2021; 603:141-147. [PMID: 34186391 DOI: 10.1016/j.jcis.2021.06.098] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 06/14/2021] [Accepted: 06/15/2021] [Indexed: 11/17/2022]
Abstract
HYPOTHESIS Weakly hydrated nanometric ions, called superchaotropes, were recently shown to adsorb strongly to non-ionic surfaces affecting drastically the surface's physical-chemical properties due to a charging effect. Superchaotropic ions could serve as stabilizing agents for non-ionic colloidal systems, such as non-ionic surfactant foams. EXPERIMENTS We study foams of the non-ionic surfactant BrijO10 (C18:1E10) without and in presence of the superchaotropic Keggin-ion SiW12O404- (SiW). The foams are investigated under free drainage conditions by image analysis and conductimetry to reveal the effect of SiW on the foam stability, liquid drainage, and bubble size. Additionally, small angle neutron scattering on the same foams, but in a dry quasi-stationary state, provides insight into effects of SiW on the foam films. FINDINGS SiW strongly stabilizes non-ionic surfactant foams at millimolar concentrations by inducing electrostatic repulsions between foam film interfaces resulting in thicker and monodisperse foam films. A similar effect is observed with the ionic surfactant sodium dodecylsulfate (SDS) but to a lesser extent and with a different mechanism. At the foam films' interface, SiW adsorbs to the polar non-ionic surfactant heads driven by the superchaotropic effect whereas DS- anchors between non-ionic surfactant alkyl chains by the hydrophobic effect. The potential of superchaotropic ions as foam stabilizers is herein demonstrated.
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Affiliation(s)
- Max Hohenschutz
- Institut de Chimie Séparative de Marcoule, ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, France
| | - Isabelle Grillo
- Institut Laue-Langevin (ILL), 71 Avenue des Martyrs, 38000 Grenoble, France
| | - Charles Dewhurst
- Institut Laue-Langevin (ILL), 71 Avenue des Martyrs, 38000 Grenoble, France
| | - Philipp Schmid
- Institut de Chimie Séparative de Marcoule, ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, France
| | - Luc Girard
- Institut de Chimie Séparative de Marcoule, ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, France
| | - Alban Jonchère
- Institut de Chimie Séparative de Marcoule, ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, France
| | - Olivier Diat
- Institut de Chimie Séparative de Marcoule, ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, France
| | - Pierre Bauduin
- Institut de Chimie Séparative de Marcoule, ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, France.
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Schmid P, Buchecker T, Khoshsima A, Touraud D, Diat O, Kunz W, Pfitzner A, Bauduin P. Self-assembly of a short amphiphile in water controlled by superchaotropic polyoxometalates: H4SiW12O40 vs. H3PW12O40. J Colloid Interface Sci 2021; 587:347-357. [DOI: 10.1016/j.jcis.2020.12.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 11/30/2020] [Accepted: 12/01/2020] [Indexed: 01/28/2023]
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Merhi T, Jonchère A, Girard L, Diat O, Nuez M, Viñas C, Bauduin P. Highlights on the Binding of Cobalta-Bis-(Dicarbollide) with Glucose Units. Chemistry 2020; 26:13935-13947. [PMID: 32628301 DOI: 10.1002/chem.202002123] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 06/18/2020] [Indexed: 12/13/2022]
Abstract
Metalla-bis-dicarbollides, such as the cobalta-bis-dicarbollide (COSAN) anion [Co(C2 B9 H11 )2 ]- , have attracted much attention in biology but a deep understanding of their interactions with cell components is still missing. For this purpose, we studied the interactions of COSAN with the glucose moiety, which is ubiquitous at biological interfaces. Octyl-glucopyranoside surfactant (C8G1) was chosen as a model as it self-assembles in water and creates a hydrated glucose-covered interface. At low COSAN content and below the critical micellar concentration (CMC) of C8G1, COSAN binds to C8G1 monomers through the hydrophobic effect. Above the CMC of C8G1, COSAN adsorbs onto C8G1 micelles through the superchaotropic effect. At high COSAN concentrations, COSAN disrupts C8G1 micelles and the assemblies become similar to COSAN micelles but with a small amount of solubilized C8G1. Therefore, COSAN binds in a versatile way to C8G1 through either the hydrophobic or superchaotropic effect depending on their relative concentrations.
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Affiliation(s)
- Tania Merhi
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, 30207, Marcoule, France
| | - Alban Jonchère
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, 30207, Marcoule, France
| | - Luc Girard
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, 30207, Marcoule, France
| | - Olivier Diat
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, 30207, Marcoule, France
| | - Miquel Nuez
- Institute de Ciencia de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193, Bellaterra, Barcelona, Spain
| | - Clara Viñas
- Institute de Ciencia de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193, Bellaterra, Barcelona, Spain
| | - Pierre Bauduin
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM, 30207, Marcoule, France
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Hohenschutz M, Grillo I, Diat O, Bauduin P. How Nano-Ions Act Like Ionic Surfactants. Angew Chem Int Ed Engl 2020; 59:8084-8088. [PMID: 32125752 DOI: 10.1002/anie.201916193] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 01/24/2020] [Indexed: 12/20/2022]
Abstract
Recently, nanometric ions were shown to adsorb to hydrated neutral surfaces and to bind to the cavities of macrocyclic molecules with an unexpectedly strong affinity arising from a solvent-mediated effect named superchaotropicity. We show here that nano-ions at low concentrations (μm range), similarly to anionic surfactants, induce the spontaneous transformation of a swollen lyotropic lamellar phase of non-ionic surfactant into a vesicle phase. This transition occurs when the neutral lamellae acquire charges, either by adsorption of the nano-ions onto, or by anchoring of the ionic surfactant into the lamellae. In contrast to ionic surfactants, nano-ions strongly dehydrate the neutral surfactant assemblies. As a conclusion, these purely inorganic nanometric ions act as alternatives to the widely used organic ionic surfactants.
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Affiliation(s)
| | - Isabelle Grillo
- Institut Laue-Langevin (ILL), 71 Avenue des Martyrs, 38000, Grenoble, France
| | - Olivier Diat
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, France
| | - Pierre Bauduin
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Marcoule, France
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Affiliation(s)
| | - Isabelle Grillo
- Institut Laue-Langevin (ILL) 71 Avenue des Martyrs 38000 Grenoble France
| | - Olivier Diat
- ICSMCEACNRSENSCMUniv Montpellier Marcoule France
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20
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Girard L, Naskar B, Dufrêche JF, Lai J, Diat O, Bauduin P. A thermodynamic model of non-ionic surfactants' micellization in the presence of polyoxometalates. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111280] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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21
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Coste A, Poulesquen A, Diat O, Dufrêche JF, Duvail M. Investigation of the Structure of Concentrated NaOH Aqueous Solutions by Combining Molecular Dynamics and Wide-Angle X-ray Scattering. J Phys Chem B 2019; 123:5121-5130. [PMID: 31141363 DOI: 10.1021/acs.jpcb.9b00495] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Classical molecular dynamics has been performed with explicit polarization on NaOH aqueous solutions from 0.5 mol L-1 up to 9.7 mol L-1. We adapted a force field of OH- for polarizable simulation in order to reproduce the NaOH structural and thermodynamics properties in aqueous solutions. A good agreement between theoretical and experimental results has been found. Wide-angle X-ray scattering (WAXS) intensities issued from molecular dynamics are compared to experimental ones measured on Synchrotron facilities. The structure of the first coordination shell of Na+ has been studied to determine the variation of the oxygen number and hydroxide oxygen around the cation. In addition, Na+-OH- McMillan-Mayer potential issued from molecular dynamics simulations has been calculated and allows for calculating Na+-OH- pair association constant of 0.1 L mol-1, which is in good agreement with the experiments.
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Affiliation(s)
- Amaury Coste
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM , Marcoule , France
| | | | - Olivier Diat
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM , Marcoule , France
| | | | - Magali Duvail
- ICSM, Univ Montpellier, CEA, CNRS, ENSCM , Marcoule , France
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22
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Čuříková-Kindlová BA, Diat O, Štěpánek F, Vávrová K, Zbytovská J. Probing the interactions among sphingosine and phytosphingosine ceramides with non- and alpha-hydroxylated acyl chains in skin lipid model membranes. Int J Pharm 2019; 563:384-394. [PMID: 30959237 DOI: 10.1016/j.ijpharm.2019.04.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 04/02/2019] [Accepted: 04/04/2019] [Indexed: 11/26/2022]
Abstract
Ceramides (Cers) are significant constituents of the stratum corneum (SC), the uppermost skin layer responsible for skin barrier properties. Cers are a heterogeneous group of lipids whose mutual interactions are still unclear. To better understand these interactions, we characterized model membranes containing stearic acid, cholesterol, cholesterol sulfate and one or more of the following ceramides: N-stearoyl-sphingosine (CerNS), N-stearoyl-phytosphingosine (CerNP) and N-(2-hydroxy)stearoyl-phytosphingosine (CerAP). Small angle X-ray scattering and FTIR spectroscopy were used to study lipid arrangement, phase separation and thermotropic behaviour. In the one-Cer systems, the membranes with CerNP showed strong hydrogen bonding and significant phase separation, even after phase transition, while the systems containing CerAP and CerNS had increased lipid miscibility. The multi-Cer systems exhibited different behaviour. In particular, the membrane containing all three Cers was a highly miscible system with narrow one-step phase transition, which, of all the studied samples, occurred at the lowest temperatures. Our results show that even a small variation in Cer structure results in substantially different phase behaviour, which is further affected by the presence of other Cer subclasses. Interestingly, the phase behaviour of the most complex three-Cer system was simpler than that of the others, highlighting the importance of lipid diversity in real SC.
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Affiliation(s)
- Barbora Amélie Čuříková-Kindlová
- University of Chemistry and Technology Prague, Faculty of Chemical Technology, Department of Organic Technology, Technická 5, 166 28 Prague, Czech Republic
| | - Olivier Diat
- Institute de Chimie Séparative de Marcoule, ICSM, CEA, CNRS, ENSCM, Univ Montpellier, Bagnols-sur-Cèze, France
| | - František Štěpánek
- University of Chemistry and Technology Prague, Faculty of Chemical Engineering, Department of Chemical Engineering, Technická 5, 166 28 Prague, Czech Republic
| | - Kateřina Vávrová
- Charles University, Faculty of Pharmacy in Hradec Králové, Akademika Heyrovského 1203, 500 05 Hradec Králové, Czech Republic
| | - Jarmila Zbytovská
- University of Chemistry and Technology Prague, Faculty of Chemical Technology, Department of Organic Technology, Technická 5, 166 28 Prague, Czech Republic; Charles University, Faculty of Pharmacy in Hradec Králové, Akademika Heyrovského 1203, 500 05 Hradec Králové, Czech Republic.
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23
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Buchecker T, Schmid P, Grillo I, Prévost S, Drechsler M, Diat O, Pfitzner A, Bauduin P. Self-Assembly of Short Chain Poly- N-isopropylacrylamid Induced by Superchaotropic Keggin Polyoxometalates: From Globules to Sheets. J Am Chem Soc 2019; 141:6890-6899. [PMID: 30951628 DOI: 10.1021/jacs.8b12181] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We show here for the first time that short chain poly( N-isopropylacrylamide) (PNIPAM), one of the most famous thermoresponsive polymers, self-assembles in water to form (i) discrete nanometer-globules and (ii) micrometric sheets with nm-thickness upon addition of the well-known Keggin-type polyoxometalate (POM) H3PW12O40 (PW). The type of self-assembly is controlled by PW concentration: at low PW concentrations, PW adsorbs on PNIPAM chains to form globules consisting of homogeneously distributed PWs in PNIPAM droplets of several nm in size. Upon further addition of PW, a phase transition from globules to micrometric sheets is observed for PNIPAMs above a polymer critical chain length, between 18 and 44 repeating units. The thickness of the sheets is controlled by the PNIPAM chain length, here from 44 to 88 repeating units. The PNIPAM sheets are electrostatically stabilized PWs accumulated on each side of the sheets. The shortest PNIPAM chain with 18 repeating units produces PNIPAM/PW globules with 5-20 nm size but no sheets. The PW/PNIPAM self-assembly arises from a solvent mediated mechanism associated with the partial dehydration of PW and of the PNIPAM, which is related to the general propensity of POMs to adsorb on neutral hydrated surfaces. This effect, known as superchaotropy, is further highlighted by the significant increase in the lower critical solubilization temperature (LCST) of PNIPAM observed upon the addition of PW in the mM range. The influence of the POM nature on the self-assembly of PNIPAM was also investigated by using H4SiW12O40 (SiW) and H3PMo12O40 (PMo), i.e. changing the POM's charge density or polarizability in order to get deeper understanding on the role of electrostatics and polarizability in the PNIPAM self-assembly process. We show here that the superchaotropic behavior of POMs with PNIPAM polymers enables the formation and the shape control of supramolecular organic-inorganic hybrids.
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Affiliation(s)
- Thomas Buchecker
- Institute of Inorganic Chemistry, University of Regensburg , 93040 Regensburg , Germany.,ICSM, CEA, CNRS, ENSCM, Univ Montpellier , 34199 Marcoule , France
| | - Philipp Schmid
- Institute of Inorganic Chemistry, University of Regensburg , 93040 Regensburg , Germany.,ICSM, CEA, CNRS, ENSCM, Univ Montpellier , 34199 Marcoule , France
| | - Isabelle Grillo
- Institut Laue-Langevin , 6 rue Jules Horowitz , Grenoble Cedex 9 38042 , France
| | - Sylvain Prévost
- ESRF - The European Synchrotron Radiation Facility , 3800 Grenoble , France
| | - Markus Drechsler
- Laboratory of Soft Matter Electron Microscopy, University of Bayreuth , 95440 Bayreuth , Germany
| | - Olivier Diat
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier , 34199 Marcoule , France
| | - Arno Pfitzner
- Institute of Inorganic Chemistry, University of Regensburg , 93040 Regensburg , Germany
| | - Pierre Bauduin
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier , 34199 Marcoule , France
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Sun P, Huang K, Wang X, Yu J, Diat O, Liu H. Confined Complexation Reaction of Metal Ions with a Lipophilic Surfactant at the Water/Air Interface: A New Understanding Based on Surface Experiments and Molecular Dynamics Simulations. Langmuir 2019; 35:4548-4556. [PMID: 30839220 DOI: 10.1021/acs.langmuir.9b00452] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Understanding the fundamentals of confined chemical reaction was an important subject in various heterogeneous physicochemical processes. Here, we investigated the orientation behavior of an amphiphilic ligand, the tri- n-octylphosphine oxide (TOPO), in a compressed monolayer at the air/water interface and its impact on the complexation reactivity of TOPO molecules with chromate ions at the interface. The analysis of sum frequency generation and polarization modulation infrared reflection absorption spectroscopy experiments combined with surface pressure measurements reveals a significant dependence of the adsorption rate and saturated concentration of chromate ions on the orientation of TOPO molecules during the increase of the surface pressure. In parallel, the analysis of molecular dynamics simulations indicates that the interaction energy between TOPO molecules and chromate ions is strongly sensitive to the orientation of TOPO molecules confined at the water/air interface. The present work provides a novel insight into the unique chemical reactivity of molecules in a confined microenvironment, and it provides a basis for further progresses in improving chemical reactivity and selectivity of molecules in a confined environment by regulating confinement of molecules.
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Affiliation(s)
- Pan Sun
- Key Laboratory of Green Process and Engineering, Institute of Process Engineering , Chinese Academy of Sciences , Beijing 100190 , P. R. China
- University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Kun Huang
- School of Metallurgical and Ecological Engineering , University of Science and Technology Beijing , 30 Xueyuan Road , Haidian, Beijing 100083 , P. R. China
- Key Laboratory of Green Process and Engineering, Institute of Process Engineering , Chinese Academy of Sciences , Beijing 100190 , P. R. China
| | - Xinping Wang
- Department of Chemistry , Key Laboratory of Advanced Textile Materials and Manufacturing Technology of the Education Ministry, Zhejiang Sci-Tech University , Hangzhou 310018 , P. R. China
| | - Jiemiao Yu
- Key Laboratory of Green Process and Engineering, Institute of Process Engineering , Chinese Academy of Sciences , Beijing 100190 , P. R. China
| | - Olivier Diat
- Institut De Chimie Séparative de Marcoule, UMR 5257 (CEA, CNRS, UM, ENSCM) , BP 17171, 30207 Bagnols-sur-Cèze , France
| | - Huizhou Liu
- Key Laboratory of Green Process and Engineering, Institute of Process Engineering , Chinese Academy of Sciences , Beijing 100190 , P. R. China
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Paquet A, Diat O, Berthon L, Guilbaud P. Aggregation in organic phases after solvent extraction of uranyl nitrate: X-ray scattering and molecular dynamic simulations. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2018.12.051] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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26
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Malinenko A, Jonchère A, Girard L, Parrès-Maynadié S, Diat O, Bauduin P. Are Keggin's POMs Charged Nanocolloids or Multicharged Anions? Langmuir 2018; 34:2026-2038. [PMID: 29278508 DOI: 10.1021/acs.langmuir.7b03640] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Owing to their multiple charges and their nanometric size, polyoxometalates (POMs) are at the frontier between ions and charged colloids. We investigated here the effect of POM-POM electrostatics repulsions on their self-diffusion in water by varying POM and supporting salt concentrations. The self-diffusion coefficients of two Keggin's POMs [silicotungstate (SiW12O404-) and phosphotungstate (PW12O403-)] were determined by dynamic light scattering (DLS) and 1H/31P DOSY NMR, whereas POM-POM electrostatic repulsions were investigated by the determination of the static structure factors using small-angle X-ray scattering (SAXS). The self-diffusion coefficients for the two POMs and for different POM/background salt concentrations were collected in a master curve by comparing the averaged POM-POM distance in solution to the Debye length. As for classical charged colloids, we show that the POM's counterions should not be considered in the calculation of the ionic strength that governs POM-POM electrostatic repulsions. This result was confirmed by fitting the POM-POM structure factor by considering a pair potential of spherical charged particles using the well-known Hayter mean spherical approximation (MSA). These Keggin POMs also behave as (super)chaotropic anions (i.e., they have a strong propensity to adsorb on (neutral polar) surfaces, which was also investigated) here on the surface of octyl-β-glucoside (C8G1) micelles. The variations of (i) the chemical shift of 1H/31P NMR signals and (ii) the self-diffusion coefficients obtained by DOSY 1H/31P NMR of PW3- and of C8G1 were in good agreement, confirming the strong adsorption of POMs on the micelle polar surface from static and dynamic points of view. We concluded that Keggin's POMs behave (i) as anions because they adsorb on surfaces as chaotropic anions and (ii) as colloids because they can be described by a classical colloidal approach by dynamic and static scattering techniques (i.e., by the investigation of their interparticle electrostatic structure factor and self-diffusion without considering the POM's counterions in the ionic strength calculation). This work highlights the dynamic properties of POMs at soft interfaces compared to bulk aqueous solution, which is essential in the understanding of functional properties of POMs, such as (photo)catalysis and the rational design of POM-based hybrid nanomaterials from soft templating routes (i.e., in aqueous solutions at room temperature).
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Affiliation(s)
- Alla Malinenko
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier , Marcoule, France
| | - Alban Jonchère
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier , Marcoule, France
| | - Luc Girard
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier , Marcoule, France
| | | | - Olivier Diat
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier , Marcoule, France
| | - Pierre Bauduin
- ICSM, CEA, CNRS, ENSCM, Univ Montpellier , Marcoule, France
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Abstract
We propose a simple experimental procedure based on the cloud point measurement of a non-ionic surfactant as a tool for (i) estimating the super-chaotropic behaviour of polyoxometalates (POMs) and for (ii) establishing a classification of POMs according to their affinity towards polar surfaces.
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Affiliation(s)
- Thomas Buchecker
- Institute of Inorganic Chemistry
- University of Regensburg
- Regensburg
- Germany
| | - Philipp Schmid
- Institute of Inorganic Chemistry
- University of Regensburg
- Regensburg
- Germany
| | - Séverine Renaudineau
- Sorbonne Universités
- UPMC Univ Paris 06
- CNRS UMR 8232
- Institut Parisien de Chimie Moléculaire
- France
| | | | - Anna Proust
- Sorbonne Universités
- UPMC Univ Paris 06
- CNRS UMR 8232
- Institut Parisien de Chimie Moléculaire
- France
| | - Arno Pfitzner
- Institute of Inorganic Chemistry
- University of Regensburg
- Regensburg
- Germany
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Guilbaud P, Berthon L, Louisfrema W, Diat O, Zorz N. Determination of the Structures of Uranyl-Tri-n-butyl-Phosphate Aggregates by Coupling Experimental Results with Molecular Dynamic Simulations. Chemistry 2017; 23:16660-16670. [PMID: 28971546 DOI: 10.1002/chem.201703967] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Indexed: 11/10/2022]
Abstract
The complex structure of a plutonium uranium refining by extraction (PUREX) process organic phase was characterized by combining results from experiments and molecular dynamics simulations. For the first time, the molecular interactions between tri-n-butyl phosphate (TBP) and the extracted solutes, as well as TBP aggregation after the extraction of water and/or uranyl nitrate, were described and analyzed concomitantly. Coupling molecular dynamics simulations with small- and wide-angle X-ray scattering (SWAXS) experiments can lead to simulated organic solutions that are representative of the experimental ones, even for high extractant and solute concentrations. Furthermore, this coupling is well adapted for the interpretation of SWAXS experiments without preliminary hypothesis on the size or shape of aggregates. The results link together previous literature studies obtained for each level of depiction separately (complexation or aggregation). Without uranium, or at low metal concentration, almost no aggregation was observed. At high uranium concentration, organic phases contain small [UO2 (NO3 )2 (TBP)2 ]n polymetallic aggregates (with n=2 to 4), in which the 1:2 U/TBP stoichiometry is preserved.
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Affiliation(s)
- Phillipe Guilbaud
- CEA, Nuclear Energy Division, Research Department, on Mining and Fuel Recycling Processes (SPDS/LILA), BP17171, 30207, Bagnols-sur-Cèze, France
| | - Laurence Berthon
- CEA, Nuclear Energy Division, Research Department, on Mining and Fuel Recycling Processes (SPDS/LILA), BP17171, 30207, Bagnols-sur-Cèze, France
| | - Wilfried Louisfrema
- CEA, Nuclear Energy Division, Research Department, on Mining and Fuel Recycling Processes (SPDS/LILA), BP17171, 30207, Bagnols-sur-Cèze, France
| | - Olivier Diat
- Institut de Chimie Séparative de Marcoule (ICSM/ UMR 5257), CEA/CNRS/UM/ENSCM, BP17171, 30206, Bagnols-sur-Cèze, France
| | - Nicole Zorz
- CEA, Nuclear Energy Division, Research Department, on Mining and Fuel Recycling Processes (SPDS/LILA), BP17171, 30207, Bagnols-sur-Cèze, France
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Buchecker T, Le Goff X, Naskar B, Pfitzner A, Diat O, Bauduin P. Back Cover: Polyoxometalate/Polyethylene Glycol Interactions in Water: From Nanoassemblies in Water to Crystal Formation by Electrostatic Screening (Chem. Eur. J. 35/2017). Chemistry 2017. [DOI: 10.1002/chem.201701239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Thomas Buchecker
- Institute of Inorganic Chemistry; University of Regensburg; 93040 Regensburg Germany
- Institut de Chimie Séparative de Marcoule (ICSM); UMR 5257 (CEA, CNRS, UM, ENSCM), BP 17171; 30207 Bagnols-sur-Cèze France
| | - Xavier Le Goff
- Institut de Chimie Séparative de Marcoule (ICSM); UMR 5257 (CEA, CNRS, UM, ENSCM), BP 17171; 30207 Bagnols-sur-Cèze France
| | - Bappaditya Naskar
- Department of Chemistry; Sundarban Hazi Desarat College; University of Calcutta; Pathankhali 743611 India
| | - Arno Pfitzner
- Institute of Inorganic Chemistry; University of Regensburg; 93040 Regensburg Germany
| | - Olivier Diat
- Institut de Chimie Séparative de Marcoule (ICSM); UMR 5257 (CEA, CNRS, UM, ENSCM), BP 17171; 30207 Bagnols-sur-Cèze France
| | - Pierre Bauduin
- Institut de Chimie Séparative de Marcoule (ICSM); UMR 5257 (CEA, CNRS, UM, ENSCM), BP 17171; 30207 Bagnols-sur-Cèze France
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Pham TT, Jonchère A, Dufrêche JF, Brevet PF, Diat O. Analysis of the second harmonic generation signal from a liquid/air and liquid/liquid interface. J Chem Phys 2017; 146:144701. [DOI: 10.1063/1.4979879] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Thanh Tung Pham
- Institut de Chimie Séparative de Marcoule, UMR 5257 (CEA, CNRS, Université de Montpellier, ENSCM), BP17171, 30207 Bagnols sur Cèze, France
| | - Alban Jonchère
- Institut de Chimie Séparative de Marcoule, UMR 5257 (CEA, CNRS, Université de Montpellier, ENSCM), BP17171, 30207 Bagnols sur Cèze, France
| | - Jean-François Dufrêche
- Institut de Chimie Séparative de Marcoule, UMR 5257 (CEA, CNRS, Université de Montpellier, ENSCM), BP17171, 30207 Bagnols sur Cèze, France
| | - Pierre-François Brevet
- Institut Lumière Matière, UMR CNRS 5306 and Université Claude Bernard Lyon 1, 69622 Villeurbanne Cedex, France
| | - Olivier Diat
- Institut de Chimie Séparative de Marcoule, UMR 5257 (CEA, CNRS, Université de Montpellier, ENSCM), BP17171, 30207 Bagnols sur Cèze, France
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Buchecker T, Le Goff X, Naskar B, Pfitzner A, Diat O, Bauduin P. Polyoxometalate/Polyethylene Glycol Interactions in Water: From Nanoassemblies in Water to Crystal Formation by Electrostatic Screening. Chemistry 2017; 23:8434-8442. [DOI: 10.1002/chem.201700044] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Indexed: 01/28/2023]
Affiliation(s)
- Thomas Buchecker
- Institute of Inorganic Chemistry; University of Regensburg; 93040 Regensburg Germany
- Institut de Chimie Séparative de Marcoule (ICSM); UMR 5257 (CEA, CNRS, UM, ENSCM), BP 17171; 30207 Bagnols-sur-Cèze France
| | - Xavier Le Goff
- Institut de Chimie Séparative de Marcoule (ICSM); UMR 5257 (CEA, CNRS, UM, ENSCM), BP 17171; 30207 Bagnols-sur-Cèze France
| | - Bappaditya Naskar
- Department of Chemistry; Sundarban Hazi Desarat College; University of Calcutta; Pathankhali 743611 India
| | - Arno Pfitzner
- Institute of Inorganic Chemistry; University of Regensburg; 93040 Regensburg Germany
| | - Olivier Diat
- Institut de Chimie Séparative de Marcoule (ICSM); UMR 5257 (CEA, CNRS, UM, ENSCM), BP 17171; 30207 Bagnols-sur-Cèze France
| | - Pierre Bauduin
- Institut de Chimie Séparative de Marcoule (ICSM); UMR 5257 (CEA, CNRS, UM, ENSCM), BP 17171; 30207 Bagnols-sur-Cèze France
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Fadel O, Girard L, Gomes Rodrigues D, Bauduin P, Le Goff X, Rossignol-Castera A, L'Hermitte A, Diat O. Micellization in vegetable oils: A structural characterisation. Colloids Surf B Biointerfaces 2017; 154:279-286. [PMID: 28351800 DOI: 10.1016/j.colsurfb.2017.03.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 03/10/2017] [Accepted: 03/11/2017] [Indexed: 11/26/2022]
Abstract
The solubilisation of polar and polyphenol antioxidant in vegetable oils was studied. It was shown that the use of a polyglyceryl-3-diisostearate (PG3DS), a bio-sourced emulsifier well known in cosmetics, increases the yield of solubilisation thanks to some aggregation properties analysed using x-ray scattering technique. We show indeed that PG3DS forms reverse aggregates with a critical concentration that depends on the oil polarity. PG3DS reverse aggregates are elongated with a polar core and cannot be really swollen by addition of water. This supramolecular organisation allows however an efficient solubilisation of polar antioxidants in vegetable oils.
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Affiliation(s)
- Ophélie Fadel
- Institut de Chimie Separative de Marcoule, UMR 5257 (CEA, CNRS, Université de Montpellier, ENSCM), BP17171, 30207 Bagnols sur Cèze, France
| | - Luc Girard
- Institut de Chimie Separative de Marcoule, UMR 5257 (CEA, CNRS, Université de Montpellier, ENSCM), BP17171, 30207 Bagnols sur Cèze, France
| | - Donatien Gomes Rodrigues
- Institut de Chimie Separative de Marcoule, UMR 5257 (CEA, CNRS, Université de Montpellier, ENSCM), BP17171, 30207 Bagnols sur Cèze, France
| | - Pierre Bauduin
- Institut de Chimie Separative de Marcoule, UMR 5257 (CEA, CNRS, Université de Montpellier, ENSCM), BP17171, 30207 Bagnols sur Cèze, France
| | - Xavier Le Goff
- Institut de Chimie Separative de Marcoule, UMR 5257 (CEA, CNRS, Université de Montpellier, ENSCM), BP17171, 30207 Bagnols sur Cèze, France
| | | | - Annabelle L'Hermitte
- OLEOS SA/Hallstar France, 50 rue du Rajol, Fréjorgues Est, 34130 Mauguio, France
| | - Olivier Diat
- Institut de Chimie Separative de Marcoule, UMR 5257 (CEA, CNRS, Université de Montpellier, ENSCM), BP17171, 30207 Bagnols sur Cèze, France.
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Prevost S, Lopian T, Pleines M, Diat O, Zemb T. Small-angle scattering and morphologies of ultra-flexible microemulsions. J Appl Crystallogr 2016; 49:2063-2072. [PMID: 27980512 PMCID: PMC5139994 DOI: 10.1107/s1600576716016150] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 10/11/2016] [Indexed: 11/23/2022] Open
Abstract
Three-component fluids can exhibit structured density fluctuations, and their small-angle scattering patterns present similarities to those of classical microemulsions. One general analytical expression with two additive contributions (one for the two immiscible fluids and a smaller one for a structured fluid) allows the whole phase diagram to be mapped in the single-phase domain. The phase diagrams of ternary mixtures of partly miscible solvents containing a hydrotropic co-solvent exhibit a variable miscibility gap and one critical point. This work investigates the entire monophasic region far from and near to the miscibility gap in octan-1-ol/ethanol/water, for which ultra-flexible microemulsions (UFMEs) are observed by small-angle scattering techniques. SWAXS (combined small- and wide-angle X-ray scattering) allows the elucidation of these types of structure. Three distinct areas can be identified in the phase diagram, with scattering data resembling those from direct, bicontinuous and reverse local structures. These UFMEs are far more polydisperse than their surfactant-based counterparts. Water-rich and solvent-rich domains are only delimited by a small excess of hydrotrope, instead of a well defined surfactant layer of fixed area per molecule. It is shown that all scattering spectra obtained for the nanostructured compositions can be modelled by a simple unified analytical model composed of two uncorrelated contributions. The main one is the Ornstein–Zernike formula for composition fluctuations which gives information about the pseudo-phase domain size. The second is a Lorentzian that captures the structure of at least one of the coexisting pseudo-phases. No Porod law can be measured in the SAXS domain. The proposed expression gives access to two characteristic sizes as well as one inter-aggregate distance.
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Affiliation(s)
- Sylvain Prevost
- ESRF - The European Synchrotron, 71 avenue des Martyrs, 38000 Grenoble, France
| | - Tobias Lopian
- Institut de Chimie Séparative de Marcoule (ICSM), UMR 5257 (CEA/CNRS/UM2/ENCSM), 30207 Bagnols-sur-Cèze, France; Institute of Physical and Theoretical Chemistry, University of Regensburg, 93040 Regensburg, Germany
| | - Maximilian Pleines
- Institut de Chimie Séparative de Marcoule (ICSM), UMR 5257 (CEA/CNRS/UM2/ENCSM), 30207 Bagnols-sur-Cèze, France; Institute of Physical and Theoretical Chemistry, University of Regensburg, 93040 Regensburg, Germany
| | - Olivier Diat
- Institut de Chimie Séparative de Marcoule (ICSM), UMR 5257 (CEA/CNRS/UM2/ENCSM), 30207 Bagnols-sur-Cèze, France
| | - Thomas Zemb
- Institut de Chimie Séparative de Marcoule (ICSM), UMR 5257 (CEA/CNRS/UM2/ENCSM), 30207 Bagnols-sur-Cèze, France
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Boubekri R, Gross M, In M, Diat O, Nobili M, Möhwald H, Stocco A. MHz Ultrasound Induced Roughness of Fluid Interfaces. Langmuir 2016; 32:10177-10183. [PMID: 27635785 DOI: 10.1021/acs.langmuir.6b02167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The interface between two fluids is never flat at the nanoscale, and this is important for transport across interfaces. In the absence of any external field, the surface roughness is due to thermally excited capillary waves possessing subnanometric amplitudes in the case of simple liquids. Here, we investigate the effect of ultrasound on the surface roughness of liquid-gas and liquid-liquid interfaces. Megahertz (MHz) frequency ultrasound was applied normal to the interface at relatively low ultrasonic pressures (<0.6 MPa), and the amplitudes of surface fluctuations have been measured by light reflectivity and ellipsometry. We found a dramatic enhancement of surface roughness, roughly linear with intensity, with vertical displacements of the interface as high as 50-100 nm. As a consequence, the effective contact area between two fluids can be increased by ultrasound. This result has a clear impact for enhancing interface based processes such as mass or heat transfer.
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Affiliation(s)
- Rym Boubekri
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Univ. Montpellier, Montpellier F-34095, France
- Institut de Chimie Séparative de Marcoule, UMR 5257 (CEA, CNRS, UM, ENSCM), BP 17171, 30207 Cedex Bagnols-sur-Cèze, France
| | - Michel Gross
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Univ. Montpellier, Montpellier F-34095, France
| | - Martin In
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Univ. Montpellier, Montpellier F-34095, France
| | - Olivier Diat
- Institut de Chimie Séparative de Marcoule, UMR 5257 (CEA, CNRS, UM, ENSCM), BP 17171, 30207 Cedex Bagnols-sur-Cèze, France
| | - Maurizio Nobili
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Univ. Montpellier, Montpellier F-34095, France
| | - Helmuth Möhwald
- Max-Planck-Institute of Colloids and Interfaces , Am Mühlenberg, 14476 Potsdam, Germany
| | - Antonio Stocco
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Univ. Montpellier, Montpellier F-34095, France
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Poirot R, Le Goff X, Diat O, Bourgeois D, Meyer D. Inside Cover: Metal Recognition Driven by Weak Interactions: A Case Study in Solvent Extraction (ChemPhysChem 14/2016). Chemphyschem 2016. [DOI: 10.1002/cphc.201600612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Rémi Poirot
- Laboratory of Hybrid Systems for the Separation (LHYS); Marcoule Institute for Separative Chemistry (ICSM); BP 17171 30207 Bagnols-sur-Cèze France
| | - Xavier Le Goff
- Laboratory of Matter in Environmental Conditions (L2 ME); Marcoule Institute for Separative Chemistry (ICSM); BP 17171 30207 Bagnols-sur-Cèze France
| | - Olivier Diat
- Ions at Active Interfaces Laboratory (L2IA); Marcoule Institute for Separative Chemistry (ICSM); BP 17171 30207 Bagnols-sur-Cèze France
| | - Damien Bourgeois
- Laboratory of Hybrid Systems for the Separation (LHYS); Marcoule Institute for Separative Chemistry (ICSM); BP 17171 30207 Bagnols-sur-Cèze France
| | - Daniel Meyer
- Laboratory of Hybrid Systems for the Separation (LHYS); Marcoule Institute for Separative Chemistry (ICSM); BP 17171 30207 Bagnols-sur-Cèze France
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Scoppola E, Watkins EB, Campbell RA, Konovalov O, Girard L, Dufrêche J, Ferru G, Fragneto G, Diat O. Solvent Extraction: Structure of the Liquid–Liquid Interface Containing a Diamide Ligand. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201603395] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ernesto Scoppola
- Institut Laue-Langevin 38000 Grenoble France
- Institut de Chimie Séparative de MarcouleUMR 5257 CEA/CNRS/ENSCM/Université Montpellier 30207 Bagnols-sur-Cèze France
| | - Erik B. Watkins
- Institut Laue-Langevin 38000 Grenoble France
- Materials Synthesis and Integrated DevicesLos Alamos National Laboratory Los Alamos NM 87545 USA
| | | | - Oleg Konovalov
- European Synchrotron Radiation Facility 38430 Grenoble France
| | - Luc Girard
- Institut de Chimie Séparative de MarcouleUMR 5257 CEA/CNRS/ENSCM/Université Montpellier 30207 Bagnols-sur-Cèze France
| | - Jean‐Francois Dufrêche
- Institut de Chimie Séparative de MarcouleUMR 5257 CEA/CNRS/ENSCM/Université Montpellier 30207 Bagnols-sur-Cèze France
| | | | | | - Olivier Diat
- Institut de Chimie Séparative de MarcouleUMR 5257 CEA/CNRS/ENSCM/Université Montpellier 30207 Bagnols-sur-Cèze France
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Scoppola E, Watkins EB, Campbell RA, Konovalov O, Girard L, Dufrêche JF, Ferru G, Fragneto G, Diat O. Solvent Extraction: Structure of the Liquid-Liquid Interface Containing a Diamide Ligand. Angew Chem Int Ed Engl 2016; 55:9326-30. [PMID: 27320727 DOI: 10.1002/anie.201603395] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Indexed: 11/09/2022]
Abstract
Knowledge of the (supra)molecular structure of an interface that contains amphiphilic ligand molecules is necessary for a full understanding of ion transfer during solvent extraction. Even if molecular dynamics already yield some insight in the molecular configurations in solution, hardly any experimental data giving access to distributions of both extractant molecules and ions at the liquid-liquid interface exist. Here, the combined application of X-ray and neutron reflectivity measurements represents a key milestone in the deduction of the interfacial structure and potential with respect to two different lipophilic ligands. Indeed, we show for the first time that hard trivalent cations can be repelled or attracted by the extractant-enriched interface according to the nature of the ligand.
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Affiliation(s)
- Ernesto Scoppola
- Institut Laue-Langevin, 38000, Grenoble, France.,Institut de Chimie Séparative de Marcoule, UMR 5257 CEA/CNRS/ENSCM/Université Montpellier, 30207, Bagnols-sur-Cèze, France
| | - Erik B Watkins
- Institut Laue-Langevin, 38000, Grenoble, France.,Materials Synthesis and Integrated Devices, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | | | - Oleg Konovalov
- European Synchrotron Radiation Facility, 38430, Grenoble, France
| | - Luc Girard
- Institut de Chimie Séparative de Marcoule, UMR 5257 CEA/CNRS/ENSCM/Université Montpellier, 30207, Bagnols-sur-Cèze, France
| | - Jean-Francois Dufrêche
- Institut de Chimie Séparative de Marcoule, UMR 5257 CEA/CNRS/ENSCM/Université Montpellier, 30207, Bagnols-sur-Cèze, France
| | | | | | - Olivier Diat
- Institut de Chimie Séparative de Marcoule, UMR 5257 CEA/CNRS/ENSCM/Université Montpellier, 30207, Bagnols-sur-Cèze, France.
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Poirot R, Le Goff X, Diat O, Bourgeois D, Meyer D. Metal Recognition Driven by Weak Interactions: A Case Study in Solvent Extraction. Chemphyschem 2016; 17:2112-7. [DOI: 10.1002/cphc.201600305] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Indexed: 11/12/2022]
Affiliation(s)
- Rémi Poirot
- Laboratory of Hybrid Systems for the Separation (LHYS); Marcoule Institute for Separative Chemistry (ICSM); BP 17171 30207 Bagnols-sur-Cèze France
| | - Xavier Le Goff
- Laboratory of Matter in Environmental Conditions (L2 ME); Marcoule Institute for Separative Chemistry (ICSM); BP 17171 30207 Bagnols-sur-Cèze France
| | - Olivier Diat
- Ions at Active Interfaces Laboratory (L2IA); Marcoule Institute for Separative Chemistry (ICSM); BP 17171 30207 Bagnols-sur-Cèze France
| | - Damien Bourgeois
- Laboratory of Hybrid Systems for the Separation (LHYS); Marcoule Institute for Separative Chemistry (ICSM); BP 17171 30207 Bagnols-sur-Cèze France
| | - Daniel Meyer
- Laboratory of Hybrid Systems for the Separation (LHYS); Marcoule Institute for Separative Chemistry (ICSM); BP 17171 30207 Bagnols-sur-Cèze France
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Zemb TN, Klossek M, Lopian T, Marcus J, Schöettl S, Horinek D, Prevost SF, Touraud D, Diat O, Marčelja S, Kunz W. How to explain microemulsions formed by solvent mixtures without conventional surfactants. Proc Natl Acad Sci U S A 2016; 113:4260-5. [PMID: 27044068 PMCID: PMC4843454 DOI: 10.1073/pnas.1515708113] [Citation(s) in RCA: 118] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Ternary solutions containing one hydrotrope (such as ethanol) and two immiscible fluids, both being soluble in the hydrotrope at any proportion, show unexpected solubilization power and allow strange but yet unexplained membrane enzyme activity. We study the system ethanol-water-octanol as a simple model of such kinds of ternary solutions. The stability of "detergentless" micelles or microemulsions in such mixtures was proposed in the pioneering works of Barden and coworkers [Smith GD, Donelan CE, Barden RE (1977)J Colloid Interface Sci60(3):488-496 and Keiser BA, Varie D, Barden RE, Holt SL (1979)J Phys Chem83(10):1276-1281] in the 1970s and then, neglected, because no general explanation for the observations was available. Recent direct microstructural evidence by light, X-ray, and neutron scattering using contrast variation reopened the debate. We propose here a general principle for solubilization without conventional surfactants: the balance between hydration force and entropy. This balance explains the stability of microemulsions in homogeneous ternary mixtures based on cosolvents.
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Affiliation(s)
- Thomas N Zemb
- ICSM (Institut de Chimie Séparative de Marcoule), UMR 5257 (Commissariat a l'energie atomique et aux energies alternatives/CNRS/Ecole Nationale Supérieure de Chimie de Montpellier, Université de Montpellier), 30207 Bagnols sur Cèze, France;
| | - Michael Klossek
- Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93053 Regensburg, Germany
| | - Tobias Lopian
- ICSM (Institut de Chimie Séparative de Marcoule), UMR 5257 (Commissariat a l'energie atomique et aux energies alternatives/CNRS/Ecole Nationale Supérieure de Chimie de Montpellier, Université de Montpellier), 30207 Bagnols sur Cèze, France; Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93053 Regensburg, Germany
| | - Julien Marcus
- Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93053 Regensburg, Germany
| | - Sebastian Schöettl
- Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93053 Regensburg, Germany
| | - Dominik Horinek
- Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93053 Regensburg, Germany
| | - Sylvain F Prevost
- European Synchrotron Radiation Facility (ESRF), 38043 Grenoble, CEDEX 9, France
| | - Didier Touraud
- Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93053 Regensburg, Germany
| | - Olivier Diat
- ICSM (Institut de Chimie Séparative de Marcoule), UMR 5257 (Commissariat a l'energie atomique et aux energies alternatives/CNRS/Ecole Nationale Supérieure de Chimie de Montpellier, Université de Montpellier), 30207 Bagnols sur Cèze, France
| | - Stjepan Marčelja
- Department of Applied Mathematics, Research School of Physics & Engineering, Australian National University, Canberra, ACT 0200, Australia
| | - Werner Kunz
- ICSM (Institut de Chimie Séparative de Marcoule), UMR 5257 (Commissariat a l'energie atomique et aux energies alternatives/CNRS/Ecole Nationale Supérieure de Chimie de Montpellier, Université de Montpellier), 30207 Bagnols sur Cèze, France; Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93053 Regensburg, Germany;
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Dedovets D, Bauduin P, Causse J, Girard L, Diat O. Switchable self-assembly of Prussian blue analogs nano-tiles triggered by salt stimulus. Phys Chem Chem Phys 2016; 18:3188-96. [DOI: 10.1039/c5cp06574g] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We showed fully reversible, ionic strength controlled self-assembly of Prussian blue analogues nano-tiles into large superlattice structures.
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Affiliation(s)
- D. Dedovets
- Institut de Chimie Séparative de Marcoule ICSM
- UMR 5257
- CNRS/CEA/UM/ENSCM
- Bagnols-sur-Céze 30207
- France
| | - P. Bauduin
- Institut de Chimie Séparative de Marcoule ICSM
- UMR 5257
- CNRS/CEA/UM/ENSCM
- Bagnols-sur-Céze 30207
- France
| | - J. Causse
- Institut de Chimie Séparative de Marcoule ICSM
- UMR 5257
- CNRS/CEA/UM/ENSCM
- Bagnols-sur-Céze 30207
- France
| | - L. Girard
- Institut de Chimie Séparative de Marcoule ICSM
- UMR 5257
- CNRS/CEA/UM/ENSCM
- Bagnols-sur-Céze 30207
- France
| | - O. Diat
- Institut de Chimie Séparative de Marcoule ICSM
- UMR 5257
- CNRS/CEA/UM/ENSCM
- Bagnols-sur-Céze 30207
- France
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Mouri A, Diat O, El Ghzaoui A, Ly I, Dorandeu C, Maurel JC, Devoisselle JM, Legrand P. Development of pharmaceutical clear gel based on Peceol®, lecithin, ethanol and water: Physicochemical characterization and stability study. J Colloid Interface Sci 2015; 457:152-61. [DOI: 10.1016/j.jcis.2015.06.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Revised: 06/03/2015] [Accepted: 06/04/2015] [Indexed: 10/23/2022]
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Fischer V, Marcus J, Touraud D, Diat O, Kunz W. Toward surfactant-free and water-free microemulsions. J Colloid Interface Sci 2015; 453:186-193. [DOI: 10.1016/j.jcis.2015.04.069] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Revised: 04/29/2015] [Accepted: 04/30/2015] [Indexed: 11/26/2022]
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Scoppola E, Watkins E, Li Destri G, Porcar L, Campbell RA, Konovalov O, Fragneto G, Diat O. Structure of a liquid/liquid interface during solvent extraction combining X-ray and neutron reflectivity measurements. Phys Chem Chem Phys 2015; 17:15093-7. [PMID: 25993438 DOI: 10.1039/c5cp01809a] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
We have resolved the molecular structure of a bulk oil/water interface that contains amphiphilic ligand molecules using a combination of X-ray and neutron reflectivity measurements for the first time. This new capability can greatly impact future work in the field of ion separation by phase transfer, i.e. liquid/liquid extraction.
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Affiliation(s)
- E Scoppola
- Institut Laue-Langevin, 71 avenue des Martyrs, F-38000 Grenoble, France
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Gassin PM, Girard L, Martin-Gassin G, Brusselle D, Jonchère A, Diat O, Viñas C, Teixidor F, Bauduin P. Surface activity and molecular organization of metallacarboranes at the air-water interface revealed by nonlinear optics. Langmuir 2015; 31:2297-2303. [PMID: 25644035 DOI: 10.1021/acs.langmuir.5b00125] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Because of their amphiphilic structure, surfactants adsorb at the water-air interface with their hydrophobic tails pointing out of the water and their polar heads plunging into the liquid phase. Unlike classical surfactants, metallabisdicarbollides (MCs) do not have a well-defined amphiphilic structure. They are nanometer-sized inorganic anions with an ellipsoidal shape composed of two carborane semicages sandwiching a metal ion. However, MCs have been shown to share many properties with surfactants, such as self-assembly in water (formation of micelles and vesicles), formation of lamellar lyotropic phases, and surface activity. By combining second harmonic generation and surface tension measurement, we show here that cobaltabis(dicarbollide) anion {[(C2B9H11)2Co](-) also named [COSAN](-)} with H(+) as a counterion, the most representative metallacarborane, adsorbs vertically at the water surface with its long axis normal to the surface. This vertical molecular orientation facilitates the formation of intermolecular and nonconventional dihydrogen bonds such as the B-H(δ-)···(δ+)H-C bond that has recently been proven to be at the origin of the self-assembly of MCs in water. Therefore, it appears here that lateral dihydrogen bonds are also involved in the surface activity of MCs.
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Affiliation(s)
- Pierre-Marie Gassin
- Institut de Chimie Séparative de Marcoule, UMR 5257 (CEA-CNRS-UM-ENSCM) , B.P. 17171, 30207 Bagnols sur Cèze Cedex, France
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Abstract
Top: Schematic representation of the hard templating approach. Bottom left: SAXS profiles at each step of the SiC elaboration. Bottom right: SEM images of porous SiC.
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Affiliation(s)
- Thibaud Nardin
- Institut de Chimie Séparative de Marcoule
- UMR 5257 CEA/CNRS/UM/ENSCM
- F-30207 Bagnols-sur-Cèze
- France
| | - Julien Cambedouzou
- Institut de Chimie Séparative de Marcoule
- UMR 5257 CEA/CNRS/UM/ENSCM
- F-30207 Bagnols-sur-Cèze
- France
| | - Johann Ravaux
- Institut de Chimie Séparative de Marcoule
- UMR 5257 CEA/CNRS/UM/ENSCM
- F-30207 Bagnols-sur-Cèze
- France
| | - Cyrielle Rey
- Institut de Chimie Séparative de Marcoule
- UMR 5257 CEA/CNRS/UM/ENSCM
- F-30207 Bagnols-sur-Cèze
- France
| | - Daniel Meyer
- Institut de Chimie Séparative de Marcoule
- UMR 5257 CEA/CNRS/UM/ENSCM
- F-30207 Bagnols-sur-Cèze
- France
| | - Olivier Diat
- Institut de Chimie Séparative de Marcoule
- UMR 5257 CEA/CNRS/UM/ENSCM
- F-30207 Bagnols-sur-Cèze
- France
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Marcus J, Touraud D, Prévost S, Diat O, Zemb T, Kunz W. Influence of additives on the structure of surfactant-free microemulsions. Phys Chem Chem Phys 2015; 17:32528-38. [DOI: 10.1039/c5cp06364g] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In surfactant-free microemulsions, the combination ethanol/antagonistic salt behaves like a surfactant.
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Affiliation(s)
- J. Marcus
- Institute of Physical and Theoretical Chemistry
- University of Regensburg
- 93040 Regensburg
- Germany
| | - D. Touraud
- Institute of Physical and Theoretical Chemistry
- University of Regensburg
- 93040 Regensburg
- Germany
| | - S. Prévost
- ESRF
- The European Synchrotron
- 38000 Grenoble
- France
| | - O. Diat
- Institut de Chimie Séparative de Marcoule
- UMR 5257 (CEA/CNRS/UM/ENSCM)
- 30207 Bagnols sur Cèze
- France
| | - T. Zemb
- Institut de Chimie Séparative de Marcoule
- UMR 5257 (CEA/CNRS/UM/ENSCM)
- 30207 Bagnols sur Cèze
- France
| | - W. Kunz
- Institute of Physical and Theoretical Chemistry
- University of Regensburg
- 93040 Regensburg
- Germany
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Mouri A, Diat O, Lerner DA, Ghzaoui AE, Ajovalasit A, Dorandeu C, Maurel JC, Devoisselle JM, Legrand P. Water solubilization capacity of pharmaceutical microemulsions based on Peceol®, lecithin and ethanol. Int J Pharm 2014; 475:324-34. [DOI: 10.1016/j.ijpharm.2014.07.018] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 07/09/2014] [Accepted: 07/11/2014] [Indexed: 11/27/2022]
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Li Y, Fabiano-Tixier AS, Ruiz K, Rossignol Castera A, Bauduin P, Diat O, Chemat F. Comprehension of direct extraction of hydrophilic antioxidants using vegetable oils by polar paradox theory and small angle X-ray scattering analysis. Food Chem 2014; 173:873-80. [PMID: 25466101 DOI: 10.1016/j.foodchem.2014.10.061] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 09/14/2014] [Accepted: 10/11/2014] [Indexed: 11/28/2022]
Abstract
Since the polar paradox theory rationalised the fact that polar antioxidants are more effective in nonpolar media, extractions of phenolic compounds in vegetable oils were inspired and achieved in this study for obtaining oils enriched in phenolic compounds. Moreover, the influence of surfactants on the extractability of phenolic compounds was experimentally studied first, followed by the small angle X-ray scattering analysis for the oil structural observation before and after extraction so as to better understand the dissolving mechanism underpinning the extraction. The results showed a significant difference on the extraction yield of phenolic compounds among oils, which was mainly dependent on their composition instead of the unsaturation of fatty acids. Appropriate surfactant additions could significantly improve extraction yield for refined sunflower oils, which 1% w/w addition of glyceryl oleate was determined as the optimal. Besides, 5% w/w addition of lecithin performed the best in oil enrichments compared with mono- and di-glycerides.
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Affiliation(s)
- Ying Li
- Avignon University, INRA, SQPOV, UMR408, GREEN Extraction Team, F-84000 Avignon, France
| | | | - Karine Ruiz
- Avignon University, INRA, SQPOV, UMR408, GREEN Extraction Team, F-84000 Avignon, France
| | | | - Pierre Bauduin
- Institut de Chimie Séparative de Marcoule, ICSM UMR 5257 (CEA/CNRS/UM2/ENSCM), 30206 Bagnols sur Cèze, France
| | - Olivier Diat
- Institut de Chimie Séparative de Marcoule, ICSM UMR 5257 (CEA/CNRS/UM2/ENSCM), 30206 Bagnols sur Cèze, France
| | - Farid Chemat
- Avignon University, INRA, SQPOV, UMR408, GREEN Extraction Team, F-84000 Avignon, France.
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Cambedouzou J, Diat O. Measuring the specific surface area of mesoporous silica using x-ray scattering. Acta Crystallogr A Found Adv 2014. [DOI: 10.1107/s2053273314094005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The development of porous silica or carbon material with high specific surface area raises a high interest in the field of materials science given their potential interest in a wide range of applications including catalysis, water treatment or drug delivery. Among these mesoporous structures, those consisting of one-dimensional pores aligned along a compact hexagonal packing are of prime importance and can be referred to as "hexagonal mesoporous materials" (HMPM). The most famous silica structures of this kind are MCM-41 and SBA-15. The same symmetry can be found in carbon mesoporous materials, for example in FDU-15 structures. The precise characterization of HMPM is necessary for most of the applications envisioned for these materials (pore size, pore density, specific surface and sometimes thickness of the functionalization layer). Small angle X-ray scattering techniques offer the opportunity to determine the mean structural parameters of HMPM. Although different approaches can be found in the literature in order to numerically reproduce the experimental data obtained on HMPM or hexagonal liquid crystals, when the sample is a powder, fitting the experimental data in absolute scale with numerical models becomes necessary. However, with a large scattering contribution of grain at low q vector as well as short range correlation contribution at large q, the analysis is not so simple. In this paper, we propose a comprehensive study [1] devoted to the quantitative interpretation of small-angle scattering patterns of HMPM in terms of structure and specific surface estimation based on the formalism proposed by Spalla et al. [2]. In the case of two real samples, namely a SBA-15 and a MCM-41 powder, the specific surface area of the mesopores is estimated and is discussed in the light of gas adsorption measurements.
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Rodrigues F, Ferru G, Berthon L, Boubals N, Guilbaud P, Sorel C, Diat O, Bauduin P, Simonin J, Morel J, Morel-Desrosiers N, Charbonnel M. New insights into the extraction of uranium(VI) by an N,N-dialkylamide. Mol Phys 2014. [DOI: 10.1080/00268976.2014.902139] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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