Isabelle Pochard

Université de franche-comté

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André Nonat

Université de Bourgogne

Christophe Labbez

Université de Bourgogne

C.C. Buron

Université de franche-comté

Siham Mouhtadi

Université de franche-comté

Barbara Lothenbach

Swiss Federal Laboratories for Materials Science and Technology

Ellina Bernard

Asphalt Institute

Bo Jönsson

Lund University

A. Foissy

Université de franche-comté

Céline Cau-Dit-Coumes

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Alexandre Dauzères

Institut de Radioprotection et de Sûreté Nucléaire

Cooperative Institutions

Centre National de la Recherche Scientifique

Université de Bourgogne

Laboratoire Interdisciplinaire Carnot de Bourgogne

Université Bourgogne Franche-Comté

Université de franche-comté

Institut UTINAM

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Maison des Sciences de l’Homme de Dijon

Uppsala University

Laboratoire de Chimie

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Fabrication of Ni(OH)2 / alginate composite films via layer-by-layer method

Siham Mouhtadi C.C. Buron Isabelle Pochard

Layer by layer

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Solvent‐Free Synthesis of PMMA Particles using Tandem Acoustic Emulsification

ChemistrySelect (2024)

L. Baissac Theo Salvi F.E. Jurin Isabelle Pochard Jean‐Yves Hihn

Abstract Poly(methyl methacrylate) (PMMA) colloidal particles are nowadays extensively used in several applications and more specifically in nanotechnology. Challenges are focused on the green synthesis process leading to size‐controlled particles. In the present work, PMMA particles were successfully synthesized using tandem acoustic emulsification in water without organic solvent, and cross‐linkers. 2,2′‐azobis(2‐methylpropionamidine) dihydrochloride (AIBA) or ammonium persulfate (APS), were used as initiators. Parameters leading to size control were clearly identified. Consequently, the cooling rate of the solution after polymerization time appears dominating. Particle size distribution was monodispersed for both initiators. A nonionic surfactant, Tween 20, was also added, leading to a decrease in size particle and an increase in synthesis yield. Depending on the chemical groups provided by the initiator, PMMA particles appear negatively or positively charged. These charges located on the particle surface led to stable particle dispersion by limiting aggregation phenomena. Tunable surface charge was confirmed across the elaboration of coatings only made of PMMA particles, using conventional techniques wherein charged species are needed (Layer‐by‐Layer assembly and electrophoretic deposition). PMMA particles were also labelled using fluorescent dyes. Fluorescein and Nile Blue A were loaded during the polymerization process to ensure a homogeneous distribution of the dyes within the particles.

Ammonium persulfate

Particle (ecology)

Dispersion polymerization

Zeta potential

Emulsion polymerization

10.1002/slct.202304310

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Dielectric Spectroscopy Study of Water Behavior in Calcined Upsalite: A Mesoporous Magnesium Carbonate without Organic Surface Groups

The Journal of Physical Chemistry C (2015)

Isabelle Pochard Sara Frykstrand Joakim Eriksson Simon Gustafsson Ken Welch

The water sorption properties and the dielectric spectroscopy response of calcined Upsalite, a novel mesoporous and amorphous magnesium carbonate material candidate for several life-science-based application areas, were investigated. The calcination of Upsalite at 250 °C, which removes organic groups present in the uncalcined material, is found to significantly affect the behavior of adsorbed water. The proportion of free to bound water is considerably higher in the calcined material as compared to the uncalcined counterpart for relative humidities above ∼80%. The amount of free water in calcined Upsalite remains high even when the relative humidity is subsequently decreased and is the most likely cause of crystallization of the material into nesquehonite upon high humidity storage. In chorus, the presence of organic groups in uncalcined Upalite most likely accounts for the higher binding degree of adsorbed water and, thus, the less likelihood of water-induced crystallization of this version of the material. Two dielectric relaxation processes were observed in calcined Upsalite and were attributed to a Maxwell–Wagner and a Stern-layer relaxation process. The presented results create a fundamental understanding of water interaction properties in the novel mesoporous magnesium carbonate material Upsalite and are expected to facilitate optimization of the stability of the material while simultaneously ensuring the lack of toxic surface groups—properties of importance for novel drug formulations and other life-science applications.

10.1021/acs.jpcc.5b02370

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Incorporation of paper sludge in clay mixtures used for fired-clay bricks manufacturing

Nathalie Courtois Isabelle Pochard Jean‐Yves Hihn Laurent Tourneret

Clay soil

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Colloidal particles adsorption fluctuations: experimental and kirk-wood buff integrals approaches

Jean-Marc Simon Isabelle Pochard

Colloidal particle