Frédéric Villièras

Laboratoire Interdisciplinaire des Environnements Continentaux

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Laurent J. Michot

PHENIX laboratory

Angélina Razafitianamaharavo

Laboratoire Interdisciplinaire des Environnements Continentaux

M. Pelletier

Laboratoire Interdisciplinaire des Environnements Continentaux

Jacques Yvon

GeoRessources

J. M. Cases

Universitat Politècnica de València

Fabien Thomas

Laboratoire Interdisciplinaire des Environnements Continentaux

Bénédicte Prelot

Institut Charles Gerhardt Montpellier

Odile Barrès

Université de Lorraine

Joumana Toufaily

Lebanese University

Tayssir Hamieh

Lebanese University

Cooperative Institutions

Centre National de la Recherche Scientifique

239

Université de Lorraine

142

École Nationale Supérieure des Mines de Nancy

Laboratoire Interdisciplinaire des Environnements Continentaux

Sorbonne Université

Délégation Centre-Est

Institut National Polytechnique de Lorraine

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Lebanese University

Institut de Recherche pour le Développement

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Thermal decomposition of HfCl₄ as a function of its hydration state

Élodie Barraud Sylvie Bégin‐Colin G. Le Caër Frédéric Villièras Odile Barrès

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The Mechanisms of Collector Adsorption-Abstraction (Ionic and Non-Ionic Surfactants) on Heterogeneous Surfaces

Springer eBooks (1992)

J. M. Cases Frédéric Villièras

10.1007/978-94-011-2658-8_2

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Citations (4)

Evidences for the relationship between surface structure and reactivity of goethite nanoparticles based on advanced molecular probe methods.

Stephane Stevanovic Mouhamad Ali Ahmad Angélina Razafitianamaharavo Frédéric Villièras Odile Barrès

Reactivity

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Calorimetric Effects of Simple Ion Adsorption at the Silica/Electrolyte Interface: Quantitative Analysis of Surface Energetic Heterogeneity

Langmuir (1999)

W. Rudziński R. Charmas Wojciech Piasecki Bénédicte Prelot Fabien Thomas

The equations developed by us for the triple layer surface complexation approach, taking into account energetic heterogeneity of surface oxygens, are applied here to study the heterogeneity influences on the enthalpic effects accompanying ion adsorption at the silica/NaCl aqueous solution interface. That study is accompanied by the parallel experimental/theoretical study of the energetic heterogeneity of surface oxygens for adsorption of argon molecules which are known to interact practically only with surface oxygens. Such studies provide a simpler interpretation for information of the surface energetic heterogeneity. That additional study confirms a proper choice of the model of surface heterogeneity, accepted by us in our description of ion adsorption at the oxide/electrolyte interfaces. Our quantitative analysis also confirms quite different features of the silica/electrolyte interface, compared to those formed by other metal oxides. Namely, in the case of the silica/electrolyte interface, the adsorption of water molecules on the surface oxygens SO- is a process highly competitive with proton adsorption leading to that of formation of the neutral surface complexes SOH0.

10.1021/la981336d

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Citations (28)

Wettability Change Related to Adsorption of Organic Acids on Calcite: Experimental and Ab Initio Computational Studies

SPE Journal (1999)

Christelle Legens H. Toulhoat L. Cuiec Frédéric Villièras Thierry Palermo

Summary We have investigated the interactions between organic acids and a calcite powder by adsorption from an organic phase (benzoic acid and lauric acid in toluene) and from an aqueous phase (benzoic acid and lauric sodium salt). In addition to the experimental study, ab initio quantum chemistry calculations were performed for cluster models, simulating the interactions of molecules with calcite surface sites. At the toluene/calcite interface, acids chemisorb on surface calcium ions, replacing surface hydroxyls resulting from the previous surface hydration by water. This surface saponification phenomenon was predicted by ab initio calculations and confirmed by spectroscopic techniques. The adsorbed acids conferred a hydro-phobic character to calcite, with the higher contact angles in water for the longest alkyl chains in the organic acid. At the water/calcite interface, organic acids do not displace water. Our results support the possible existence of mixed wettability patterns, related to spatial distribution of pore sizes, in the specific case of organic acids with calcite.

Benzoic acid

10.2118/57721-pa

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Citations (30)

Talc indices from Boumnyebel (Central Cameroon), physico-chemical characteristics and geochemistry

Journal of African Earth Sciences (2006)

Charles Nkoumbou D. Njopwouo Frédéric Villièras André Njoya Clément Yonta Ngoune

Tremolite

Talc

Greenschist

Ultramafic rock

Amphibole

10.1016/j.jafrearsci.2006.01.007

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Citations (37)

Study of Physicochemical Properties of Colloidal Sediments of Litani River in Lebanon

Physics Procedia (2014)

Walaa Diab Joumana Toufaily Frédéric Villièras Bachar Koubayssi Houssein Mortada

In this paper, we were interested in studying some of interesting physicochemical properties of colloidal sediments of Litani River in Lebanon. More than 15 geographical sites were selected in different zones composing the Litani River from Baalbek region located in the north-east of Lebanon to Kasmeyeh in the south of Lebanon where the River meets the Mediterranean sea. The effect of the seasonal variations in the sediment quality and the relationship of this variability with human activities were also studied including the physical and chemical properties of sediments of Litani river in Lebanon, and especially the zeta potential of the sediments selected from the different sites on the Litani River.

10.1016/j.phpro.2014.07.037

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Citations (3)

La Science Ouverte à l'Université de Lorraine

Laetitia Bracco Julien Brancher Nicolas Fressengeas Lylette Lacôte-Gabrysiak Andreas Gutsfeld

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Étude des modifications des propriétés du talc et de la chlorite par traitement thermique

Frédéric Villièras

Les consequences d'un traitement thermique entre 400 et 1100°C sur les proprietes du talc et de la chlorite du gisement de Trimouns (Pyrenees, France) ont ete etudiees par analyse thermique, diffraction des rayons X, spectroscopie IRTF, UV-visible, RPE, RMN, et par adsorption de gaz. Ces analyses ont permis de determiner les mecanismes de reaction de la chlorite, les proprietes physico-chimiques des poudres calcinees aux differentes temperatures ainsi que les modifications de comportement en presence de mineralisateurs

Talc

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A New Molecular Probe Method To Study Surface Topography of Carbonaceous Solid Surfaces

Langmuir (1996)

W. Rudziński Krzysztof Nieszporek J. M. Cases LaurentJ. Michot Frédéric Villièras

Adsorption on a heterogeneous surface of flexible molecules composed of a number of mers, like n-alkanes for instance, is strongly affected by topography of surface adsorption sites. Therefore, fitting to experimental adsorption isotherms, theoretical expressions developed for multisite-occupancy adsorption on heterogeneous surfaces characterized by random and patchwise topography should make it possible to distinguish whether a studied solid surface is characterized by random or by patchwise topography. For certain fundamental but also practical reasons, we took into consideration carbonaceous adsorbents. Following the general approach to multisite-occupancy adsorption published recently by Rudziński and Everett, we have developed here a generalized form of the Dubinin−Astakhov isotherm equation, taking into account surface topography and the interactions between the adsorbed molecules. The developed isotherm equation has been used successfully by us to study the nature of surface topography of a number of carbonaceous adsorbents.

Solid surface

Sorption isotherm

10.1021/la9408275

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Citations (28)