| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Dugas, Pierre-Yves
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (9/9 displayed)
- 2023Shear-induced stiffening in boehmite gels: A rheo-X-ray-scattering studycitations
- 2022Synthesis of iron oxide-armored latex particles by Pickering emulsion polymerization using 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS) as auxiliary comonomercitations
- 2021Visible-Light Emulsion Photopolymerization of Acrylates and Methacrylates: Mechanistic Insights and Introduction of a Simplified Sulfur-Based Photoinitiating Systemcitations
- 2021Visible-Light Emulsion Photopolymerization of Acrylates and Methacrylates: Mechanistic Insights and Introduction of a Simplified Sulfur-Based Photoinitiating Systemcitations
- 2020Surfactant-free synthesis of layered double hydroxide-armored latex particlescitations
- 2020Laponite®-based colloidal nanocomposites prepared by RAFT-mediated surfactant-free emulsion polymerization: the role of non-ionic and anionic macroRAFT polymers in stability and morphology controlcitations
- 2020Laponite®-based colloidal nanocomposites prepared by RAFT-mediated surfactant-free emulsion polymerization: the role of non-ionic and anionic macroRAFT polymers in stability and morphology controlcitations
- 2019Improved malleability of miniemulsion-based vitrimers through in situ generation of carboxylate surfactantscitations
- 2016Synthesis of Polymer/Silica Hybrid Latexes by Surfactant-Free RAFT-Mediated Emulsion Polymerizationcitations
Places of action
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article
Shear-induced stiffening in boehmite gels: A rheo-X-ray-scattering study
Abstract
International audience ; Boehmite, an aluminum oxide hydroxide γ-AlO(OH), is broadly used in the form of particulate dispersions in industrial applications, e.g., for the fabrication of ceramics and catalyst supports or as a binder for extrusion processes. Under acidic conditions, colloidal boehmite dispersions at rest form gels, i.e., space-spanning percolated networks that behave as soft solids at rest, and yet yield and flow like liquids under large enough deformations. Like many other colloidal gels, the solid-like properties of boehmite gels at rest are very sensitive to their previous mechanical history. Our recent work [J. Rheol. 66, 91 (2022); Phys. Rev. Mater. 6, L042601 (2022)] has revealed such memory effects, where the shear experienced prior to flow cessation drives the elasticity of boehmite gels: while gels formed following application of a shear rate ˙γp larger than a critical value ˙γc are insensitive to shear history, gels formed after application of ˙γp<˙γc display reinforced viscoelastic properties and non-negligible residual stresses. Here, we provide a microstructural scenario for these striking observations by coupling rheometry and small-angle X-ray scattering. Time-resolved measurements for ˙γp<˙γc show that scattering patterns develop an anisotropic shape that persists upon flow cessation, whereas gels exposed to ˙γp>˙γc display isotropic scattering patterns upon flow cessation. Moreover, as the shear rate applied prior to flow cessation is decreased below ˙γc, the level of anisotropy frozen in the sample microstructure grows similarly to the viscoelastic properties, thus providing a direct link between mechanical stiffening and flow-induced microstructural anisotropy.