Myriam Euvrard
University of Franche-Comté
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Featured researches published by Myriam Euvrard.
Colloids and Surfaces B: Biointerfaces | 2012
Rattiya Singhon; Jérôme Husson; Michael Knorr; Boris Lakard; Myriam Euvrard
Two new silica-based composites were prepared as adsorbents for the capture of Ni(II) ions. The first strategy consists in coating chitosan on colloidal fumed silica after acidic treatment yielding the composite SiO(2)+CS. The second route involves in a first step surface condensation of triethoxysilylbutyronitrile, followed by acidic hydrolysis of the surface-bound nitrile groups affording silica particles covered by carboxylic group. In a third step, chitosan has been grafted on the surface-bound C(=O)OH groups yielding the composite SiO(2)(CO(2)H)+CS. The novel hybrid materials were characterized by IR spectroscopy, scanning electron and AFM microscopy, and zeta potential measurements. Batch experiments were conducted to study the sorption performance of these composites for Ni(II) removal from aqueous NiCl(2) solution at different pH. Both Langmuir, Freundlich, and Temkin isotherm models provide good fits with the experimental data. It was shown that these low-cost materials present a promising capacity to adsorb Ni(II) ions. At pH 7, the maximum adsorption capacity q(max)of Ni(II) on the adsorbent, is found to be 182 mg g(-1) for SiO(2)+CS, and 210 mg g(-1) for SiO(2)(CO(2)H)+CS.
Journal of Colloid and Interface Science | 2015
Thibaut Charpentier; Anne Neville; Sophie Baudin; M.J. Smith; Myriam Euvrard; Ashley Bell; Chun Wang; Richard Barker
Prevention of mineral fouling, known as scale, is a long-standing problem in a wide variety of industrial applications, such as oil production, water treatment, and many others. The build-up of inorganic scale such as calcium carbonate on surfaces and facilities is undesirable as it can result in safety risks and associated flow assurance issues. To date the overwhelming amount of research has mainly focused on chemical inhibition of scale bulk precipitation and little attention has been paid to deposition onto surfaces. The development of novel more environmentally-friendly strategies to control mineral fouling will most probably necessitate a multifunctional approach including surface engineering. In this study, we demonstrate that liquid infused porous surfaces provide an appealing strategy for surface modification to reduce mineral scale deposition. Microporous polypyrrole (PPy) coatings were fabricated onto stainless steel substrates by electrodeposition in potentiostatic mode. Subsequent infusion of low surface energy lubricants (fluorinated oil Fluorinert FC-70 and ionic liquid 1-Butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BMIm)) into the porous coatings results in liquid-repellent slippery surfaces. To assess their ability to reduce surface scaling the coatings were subjected to a calcium carbonate scaling environment and the scale on the surface was quantified using Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES). PPy surfaces infused with BMIm (and Fluorinert to a lesser extent) exhibit remarkable antifouling properties with the calcium carbonate deposition reduced by 18 times in comparison to untreated stainless steel. These scaling tests suggest a correlation between the stability of the liquid infused surfaces in artificial brines and fouling reduction efficiency. The current work shows the great potential of such novel coatings for the management of mineral scale fouling.
Journal of Colloid and Interface Science | 2010
C. Pignolet; Myriam Euvrard; A. Foissy; C. Filiâtre
The deposition of micrometric latex particles on a polarized nickel surface was investigated using a laminar flow cell equipped with a video assembly used to observe and record particle behavior near the electrode. The effects of the nature of the counterions and the concentrations of surfactants on the deposit structure were studied. Negative polystyrene latex particles were turned positive by adsorption of cetyltrimethylammonium in the form of different salts: bromide (CTAB), chloride (CTAC), and hydrogenosulfate (CTAHS). Image analysis was used to gain information on the mechanisms of particle deposition on the electrode. At CTAB concentration 5x10(-5)M, mostly single particles were deposited on the electrode and their adhesion was irreversible. The adsorption mechanism was shown to be dependent on the succession of electrophoretic migration and attractive particle-surface interactions. At a higher CTAB concentration (5x10(-4)M) a transient 3D aggregation was observed which was attributed to electroosmotic and electrohydrodynamic phenomena in the vicinity of the electrode. In the presence of CTAC, aggregates were formed on the electrode for both concentrations. In the case of CTAHS the deposition rate was very low in comparison with CTAB and CTAC. This result was explained by the lower zeta potential of the particles with respect to the other cases. The formation of the aggregates was reversible; furthermore, their morphologies were strongly dependent on the kind of counterion. The aggregates formed in CTAB solution were dense while more open structures were observed with CTAC.
Journal of Dispersion Science and Technology | 2011
Rattiya Singhon; Jérôme Husson; Michael Knorr; Myriam Euvrard
The objective of this study is the preparation of various types of functionalized silica particles for the capture of Cu(II) ions. Amino-functionalized silica and hybrid chitosan/silica particles have been prepared by grafting silica with amino groups and/or adsorption of chitosan on the surface of silica to develop efficient adsorbents for heavy metals ions in water. The adsorption of Cu(II) on these materials was carried out at pH 5 at 298 K. The kinetics were evaluated utilizing pseudo-first-order and pseudo-second-order models. The best interpretation for equilibrium data was given by both Langmuir and Freundlich isotherm models. The adsorption kinetics followed the mechanism of the pseudo-second-order equation for all systems studied. This study demonstrates that the adsorption capacities for Cu(II) ions are more efficient for the bio-hybrid material compared to amino-functionalized silica.
Desalination and Water Treatment | 2013
V. Eroini; Anne Neville; N. Kapur; Myriam Euvrard
ABSTRACT The formation of calcium carbonate mineral scale is a major issue in desalination. Understanding the precipitation and deposition of such scale is a necessity in order to prevent fouling of components and also under deposit corrosion. Research has mainly focused on either bulk scale precipitation or surface deposition. However, understanding both together is of great interest to predict and therefore prevent the formation of such inorganic deposits. This study presents an assessment of the kinetics of calcium carbonate formation in the bulk and on a stainless steel surface. The objective of the study is to improve the knowledge of the relationship between bulk precipitation and surface deposition. Both the processes (bulk precipitation and surface deposition) have been assessed together in situ and in real time. The procedure enabled the assessment of bulk precipitation by measuring the turbidity while the surface coverage of the surface scale was assessed by analysing images of the surface at di...
Desalination | 2008
A. Martinod; Myriam Euvrard; A. Foissy; Anne Neville
Journal of Crystal Growth | 2011
Myriam Euvrard; A. Martinod; Anne Neville
Journal of Crystal Growth | 2006
Myriam Euvrard; F. Membrey; C. Filiatre; C. Pignolet; A. Foissy
Separation and Purification Technology | 2013
Aurélie Escoda; Myriam Euvrard; Sophie Lakard; Jérôme Husson; Ahmed Said Mohamed; Michael Knorr
Separation and Purification Technology | 2015
Sophie Lakard; C. Magnenet; M.A. Mokhter; Myriam Euvrard; C.C. Buron; Boris Lakard