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(37) Production(s) de l'année 2020
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Microscopic precursors of failure in soft matter 
Auteur(s): Cipelletti L. , Martens Kirsten, Ramos L.
(Article) Publié:
Soft Matter, vol. 16 p.82-93 (2020)
Texte intégral en Openaccess : 
Ref HAL: hal-02634755_v1
Ref Arxiv: 1909.11961
DOI: 10.1039/C9SM01730E
WoS: 000503491000005
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Résumé: The mechanical properties of soft matter are of great importance in countless applications, in addition of being an active field of academic research. Given the relative ease with which soft materials can be deformed, their non-linear behavior is of particular relevance. Large loads eventually result in material failure. In this Perspective article, we discuss recent work aiming at detecting precursors of failure by scrutinizing the microscopic structure and dynamics of soft systems under various conditions of loading. In particular, we show that the microscopic dynamics is a powerful indicator of the ultimate fate of soft materials, capable of unveiling precursors of failure up to thousands of seconds before any macroscopic sign of weakening.
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Multistable interaction between a spherical Brownian particle and an air–water interface
Auteur(s): Villa S., Stocco A., Blanc C., Nobili M.
(Article) Publié:
Soft Matter, vol. 16 p.960 (2020)
Texte intégral en Openaccess : 
Ref HAL: hal-02460100_v1
DOI: 10.1039/C9SM01472A
WoS: 000510894800008
Exporter : BibTex | endNote
1 Citation
Résumé: We report the measurement of the interaction energy between a charged Brownian polystyrene particle and an air–water interface. The interaction potential is obtained from the Boltzmann equation by tracking particle interface distance with a specifically designed Dual-Wave Reflection Interference Microscopy (DW-RIM) setup. The particle has two equilibrium positions located at few hundreds of nanometers from the interface. The farthest position is well accounted by a DLVO model complemented by gravity. The closest one, not predicted by current models, more frequently appears in water solutions at relatively high ions concentrations, when electrostatic interaction is screened out. It is accompanied by a frozen rotational diffusion dynamics that suggests an interacting potential dependent on particle orientation and stresses the decisive role played by particle surface heterogeneities. Building up on both such experimental results, the important role of air nanobubbles pinned on the particle interface is discussed.
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