Vincent Pradines

Centre National de la Recherche Scientifique

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R. Miller

Technical University of Darmstadt

J. Krägel

Max Planck Institute of Colloids and Interfaces

E.V. Aksenenko

A.V. Dumansky Institute of Colloid and Water Chemistry

Véronique Pimienta

Softmat - Chimie des colloïdes, polymères & assemblages complexes

V. B. Fainerman

Donetsk National Medical University

J. C. Micheau

Softmat - Chimie des colloïdes, polymères & assemblages complexes

D. Lavabre

Centre National de la Recherche Scientifique

Cs. Kotsmár

University of California, Berkeley

N. Mucic

University of Novi Sad

Geneviève Pratviel

Laboratoire de Chimie de Coordination

Cooperative Institutions

Centre National de la Recherche Scientifique

Université Toulouse III - Paul Sabatier

Université de Toulouse

Max Planck Institute of Colloids and Interfaces

Laboratoire de Chimie de Coordination

Max Planck Society

Institut National Polytechnique de Toulouse

Softmat - Chimie des colloïdes, polymères & assemblages complexes

A.V. Dumansky Institute of Colloid and Water Chemistry

University of Potsdam

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Thermodynamics and Kinetics of Mixed Protein/Surfactant Adsorption Layers at Liquid Interfaces

R. Miller E.V. Aksenenko V.S. Alahverdjieva V. B. Fainerman Cs. Kotsmár

This chapter describes the equilibrium state of mixed protein/surfactant adsorption layers and the mechanisms of their formation by thermodynamic and kinetics theories. Measurements of the equilibrium adsorption state are surface or interfacial tension isotherms. While tensiometry allows following the formation of adsorption layers over a certain time interval, dilational rheology provides information on the response of the interfacial layer to small perturbations. There are additional studies which do not provide quantitative but qualitative information about protein adsorption layers. Surface and interfacial shear rheology, for example, probes the formation of structures within the adsorption layers. The chapter also shows that the general features of protein adsorption at the water—air surface and at water—oil interfaces are similar; however, there are significant quantitative differences. This is of great relevance as proteins and their mixtures with low-molecular-weight surfactants are frequently used for the stabilization of foams and emulsions.

10.1002/9781118523063.ch20

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Citations (8)

Dynamic properties of CnTAB adsorption layers at the water/oil interface

Colloids and Surfaces A Physicochemical and Engineering Aspects (2012)

N. Mucic Nina M. Kovalchuk Vincent Pradines Aliyar Javadi E.V. Aksenenko

Tensiometer (surface tension)

10.1016/j.colsurfa.2012.08.071

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Citations (15)

Hydrogen peroxide evolution during V-UV photolysis of water

Photochemical & Photobiological Sciences (2005)

Kamal Azrague Eric Bonnefille Vincent Pradines Véronique Pimienta Esther Oliveros

Oxalic Acid

Ultraviolet

Vacuum ultraviolet

Peroxide

10.1039/b500162e

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Citations (66)

Amphiphilic Organic Ion Pairs in Solution: A Theoretical Study

ChemPhysChem (2007)

Vincent Pradines Romuald Poteau Véronique Pimienta

Abstract The macroscopic manifestation of hydrophobic interactions for amphiphilic organic ion pairs (tetraalkylammonium–anion) has been shown experimentally by measuring their association constants and their affinity with the organic phase. Beyond a certain size, there is a direct relation between association constants and chain lengths in tetraalkylammonium ions. We propose to cast a bridge between these results and geometrical properties considered at the level of a single ion pair by means of quantum chemistry calculations performed on model systems: trimethylalkylammonium–pentyl sulfate instead of tetraalkylammonium–dodecyl sulfate. Two limiting cases are considered: head‐to‐head configurations, which yield an optimal electrostatic interaction between polar heads, and parallel configurations with a balance between electrostatic and hydrophobic interactions. All properties (geometries, complexation energies, and atomic charges) were obtained at the MP2 level of calculation, with water described by a continuum model (CPCM). Dispersion forces link hydrocarbon chains of tetraalkylammonium ions and pentyl sulfate, thus yielding (for the largest ion pairs) parallel configurations favored with respect to head‐to‐head geometries by solute–solvent electrostatic interactions. Given the small experimental association energies, we probe the accuracy limit of the MP2 and CPCM methods. However, clear trends are obtained as a function of chain length, which agree with the experimental observations. The calculated monotonic stabilization of ion pairs when the hydrocarbon chain increases in length is discussed in terms of electrostatic interactions (between ions and between ion pairs and water), dispersion forces, and cavitation energies.

Electrostatics

Ion-association

10.1002/cphc.200700112

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Citations (12)

Interaction of Cationic Manganese Porphyrin with G‐Quadruplex Nucleic Acids Probed by Differential Labeling of the Two Faces of the Porphyrin

Angewandte Chemie (2013)

Vincent Pradines Geneviève Pratviel

Nach Aktivierung als hochvalente Metall-Oxo-Spezies vermittelt ein freies Manganporphyrin den O-Atomtransfer (bei einer Epoxidierung) auf seinen beiden Seiten. Wird das Porphyrin (im Schema als hellblaue Ellipse gezeichnet) aber an G-Quadruplex-DNA (gelb) gebunden, so findet der O-Atomtransfer ausschließlich auf der zugänglichen Seite des Porphyrins statt. Diese Beobachtung beleuchtet den Bindungsmodus des Porphyrins an die G-Quadruplex-DNA.

G-quadruplex

Cationic polymerization

10.1002/ange.201209705

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Citations (5)

Adsorption Characteristics of Ionic Surfactants at Water/Hexane Interface Obtained by PAT and ODBA

N. Mucic Vincent Pradines Aliyar Javadi Altynay Sharipova J. Krägel

Hexane

Interface (matter)

10.1002/9783527647941.ch3

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Citations (1)

Partition of dissociable compounds in two‐phase liquid systems: a theoretical and experimental study

Journal of Physical Organic Chemistry (2006)

Vincent Pradines Sabrina Despoux Catherine Claparols Nathalie Martins J. C. Micheau

Abstract The partition at equilibrium, in a two‐phase liquid system, of a compound dissociated in one phase, or both, is expressed in terms of general equations and analyzed. Dissociation in the second phase, even weak, has a non‐negligible influence. The distribution ratio depends strongly on the concentration and can even be reversed in certain cases. All the partition and dissociation constants in each phase can be obtained from the concentrations at equilibrium measured under some given conditions. In less favorable cases, an apparent partition constant can still be estimated. This is illustrated by an experimental study, in the water/dichloromethane system, involving the partition of picric acid and cetyltrimethylammonium bromide (CTAB) followed by UV‐Visible spectroscopy, and of a series of tetraalkylammonium bromides (ethyl, propyl, and butyl) assayed by mass spectroscopy. Copyright © 2006 John Wiley & Sons, Ltd.

Picric acid

Dichloromethane

Dissociation constant

Partition equilibrium

10.1002/poc.1085

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Citations (13)

Hydrogen peroxide evolution during V-UV photolysis of water with and without pollutant

HAL (Le Centre pour la Communication Scientifique Directe) (2005)

Kamal Azrague Florence Benoît‐Marquié Marie‐Thérèse Maurette Eric Bonnefille Vincent Pradines

Source

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Citations (0)

Periodic Marangoni Instability in Surfactant (CTAB) Liquid/Liquid Mass Transfer

The Journal of Physical Chemistry B (2005)

D. Lavabre Vincent Pradines J. C. Micheau Véronique Pimienta

Periodic Marangoni convective instability has been observed in a biphasic system during the mass transfer of cetyltrimethylammonium bromide (CTAB) from an aqueous to a dichloromethane organic phase. Visualization of the convective fluxes was possible thanks to the CTAB crystals that are formed in the aqueous phase at a temperature below the Krafft point. Surface tension and electrical potential oscillations have been shown to be correlated with the fluid motion. Surface tension measurements, representative of the adsorption state, showed fast adsorption during the convective stage, followed by a slower desorption process in the quiet stage. To account for the electrical potential data, two components need to be taken into account. In the quiet stage, the signal was comparable to surface tension, and the main contribution would result from the electrical double layer formed at the interface by charged surfactants. In the convective stage, the electrical potential was furthermore related to the velocity of the fluid in the aqueous layer. Perturbations of the charge distribution in the Gouy-Chapman layer due to tangential flows could be at the origin of the phenomenon.

10.1021/jp045197m

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Citations (47)

Adsorption of Alkyltrimethylammonium Bromides at Water/Alkane Interfaces: Competitive Adsorption of Alkanes and Surfactants

Langmuir (2013)

V. B. Fainerman N. Mucic Vincent Pradines E.V. Aksenenko R. Miller

The adsorption of members of the homologous series of alkyl trimethylammonium bromides (CnTAB) is studied at water/alkane interfaces by drop profile analysis tensiometry. The results are discussed in terms of a competitive adsorption process of alkane and surfactant molecules. A thermodynamic model, derived originally for the adsorption of surfactant mixtures, is adapted such that it describes a competitive adsorption of the surfactant molecules from the aqueous phase and alkane molecules from the oil phase. This new model involves the interspecies attraction coefficient, which mutually increases the adsorption activities of the alkane and CnTAB. The effects of the alkyl chain length n of CnTABs and the influence of the number of C atoms in the alkane chain are discussed, and the physical quantities are compared to those determined at the aqueous solution/air interface. The new theoretical model for aqueous solution/oil interfaces is also compared to a theory that does not consider the adsorption of alkane. The proposed new model demonstrates good agreement with the experimental data.

Alkane

Aqueous two-phase system

Homologous series

10.1021/la402782e

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Citations (28)