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(6) Production(s) de l'année 2024
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Scaling Properties of Gelling Systems in Nonlinear Shear Experiments 
Auteur(s): Louhichi A., Morel Marie-Hélène, Ramos L., Banc A.
(Article) Publié:
Acs Macro Letters, vol. p.826-831 (2024)
Ref HAL: hal-04629902_v1
DOI: 10.1021/acsmacrolett.4c00121
Exporter : BibTex | endNote
Résumé: We study model near-critical polymer gelling systems made of gluten protein dispersions stabilized at different distances from the gel point. We impose different shear rates and follow the time evolution of the stress. For sufficiently large shear rates, an intermediate stress overshoot is measured before reaching the steady state. We evidence self-similarity of the stress overshoot as a function of the applied shear rate for samples with various distances from the gel point, which is related to the elastic energy stored by the samples, as for dense systems close to the jamming transition. In concordance with the findings for glassy and jammed systems, we also measure that the stress after flow cessation decreases as a power law with time, with a characteristic relaxation time that depends on the shear rate previously imposed. These features revealed in nonlinear rheology could be the signature of a mesoscopic dynamics, which would depend on the extent of gelation.
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Delicate Analysis of Interacting Proteins and Their Assemblies by Flow Field-Flow Fractionation Techniques
Auteur(s): Urbes Aurélien, Morel Marie-Hélène, Ramos L., Violleau Frédéric, Banc A.
(Article) Publié:
Biomacromolecules, vol. p. (2024)
Ref HAL: hal-04613885_v1
DOI: 10.1021/acs.biomac.4c00103
Exporter : BibTex | endNote
Résumé: We study the efficiency of several asymmetrical flow field-flow fractionation (AF4) techniques to investigate self-associating wheat gluten proteins. We compare the use of a denaturing buffer including sodium dodecyl sulfate (SDS) and a mild chaotropic solvent, water/ethanol, as the eluent, on a model gluten sample. Through a thorough analysis of the data obtained from coupled light scattering detectors and with the identification of molecular composition of the eluted protein, we evidence coelution events in several conditions. We show that the focus step used in conventional AF4 with the SDS buffer leads to the formation of aggregates that coelute with monomeric proteins. By contrast, a frit-inlet device enables the fractionation of individual wheat proteins in the SDS buffer. Interestingly conventional AF4, using water/ethanol as eluent, is an effective method for fractionating gluten proteins and their complex dynamic assemblies, which involve weak forces and are composed of both monomeric and polymeric proteins.
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From creep to flow: Granular materials under cyclic shear
Auteur(s): Yuan Ye, Zeng Zhikun, Yuan Houfei, Zhang Shuyang, Kob W., Wang Yujie
(Article) Publié:
Nature Communications, vol. 15 p.3866 (2024)
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Creating equilibrium glassy states via random particle bonding
Auteur(s): Ozawa M., Barrat Jean‐louis, Kob W., Zamponi Francesco
(Article) Publié:
Journal Of Statistical Mechanics: Theory And Experiment, vol. p.013303 (2024)
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Étude micromécanique et microstructurale au sein de l’albumen amylacé du grain de blé par AFM
Auteur(s): Ramonda Michel, Arnould Olivier, George M., Delenne Jean-Yves, Lullien-Pellerin Valérie
(Affiches/Poster)
25e forum des microscopies à sonde locale (Lyon, FR), 2024-04-22
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A threshold model of plastic waste fragmentation: new insights into the distribution of microplastics in the ocean and its evolution over time
Auteur(s): George M., Nallet Frédéric, Fabre P.
(Article) Publié:
Marine Pollution Bulletin, vol. 199 p.116012 (2024)
Texte intégral en Openaccess : 
Ref HAL: hal-04399066_v1
Ref Arxiv: 2307.04162
DOI: 10.1016/j.marpolbul.2023.116012
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Résumé: Plastic pollution in the aquatic environment has been assessed for many years by ocean waste collection expeditions around the globe or by river sampling. While the total amount of plastic produced worldwide is well documented, the amount of plastic found in the ocean, the distribution of particles on its surface and its evolution over time are still the subject of much debate. In this article, we propose a general fragmentation model, postulating the existence of a critical size below which particle fragmentation becomes extremely unlikely. In the frame of this model, an abundance peak appears for sizes around 1mm, in agreement with real environmental data. Using, in addition, a realistic exponential waste feed to the ocean, we discuss the relative impact of fragmentation and feed rates, and the temporal evolution of microplastics (MP) distribution. New conclusions on the temporal trend of MP pollution are drawn.
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