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Matière Molle & Verres
(72) Production(s) de l'année 2019
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Probing shear-induced rearrangements in Fourier space. II. Differential dynamic microscopy 
Auteur(s): Aime S., Cipelletti L.
(Article) Publié:
Soft Matter, vol. 15 p.213-226 (2019)
Texte intégral en Openaccess : 
Ref HAL: hal-01982835_v1
DOI: 10.1039/c8sm01564c
WoS: WOS:000454947400017
Exporter : BibTex | endNote
3 Citations
Résumé: We discuss in two companion papers how Fourier-space measurements may be coupled to rheologicaltests in order to elucidate the relationship between mechanical properties and microscopic dynamics insoft matter. In this second companion paper, we focus on Differential Dynamic Microscopy (DDM)under shear. We highlight the analogies and the differences with dynamic light scattering coupled torheology, providing a theoretical approach and practical guidelines to separate the contributions toDDM arising from the affine and the non-affine part of the microscopic displacement field. We showthat in DDM under shear the coherence of the illuminating source plays a key role, determining theeffective sample thickness that is probed. Our theoretical analysis is validated by experiments on 2Dsamples and 3D gels.
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Physico-chemical properties and surface characterization of renewable hybrid nanofilms interacting with model proteins
Auteur(s): Theodoratou A., Costa Luca, Bonnet L., Blanc C., Lapinte Vincent, Etienne P., Milhiet Pierre-Emmanuel, Robin Jean-Jacques, Oberdisse J., Chopineau Joel, Aubert-Pouessel Anne
(Article) Publié:
European Polymer Journal, vol. 111 p.161-169 (2019)
Texte intégral en Openaccess : 
Ref HAL: hal-01974331_v1
DOI: 10.1016/j.eurpolymj.2018.12.018
WoS: 000458597600018
Exporter : BibTex | endNote
2 Citations
Résumé: A comprehensive characterization of physical-chemical properties and biological interactions of ca. 200-nm-thick hybrid films based on silylated (inorganic part) castor oil (organic part) is proposed. A series of such nanofilms was fabricated and cross-linked by a sol-gel procedure, and their properties such as hydrophilicity, hardness and water vapour transmission rate were systematically studied as a function of the ratio of silylated agent to castor oil. It was found that the nanofilms have contact angles always below 90°, tunable Young modulus and hardness in the MPa range. Moreover, their water vapour transmission rates are increased by decreasing the silica ratio. The protein adsorption and cytocompatibility were evaluated using model proteins and cells. The adsorption of the proteins bovine serum albumin (BSA) and lysozyme was characterized using a quartz crystal microbalance in energy dissipation mode (QCM-D), and atomic force microscopy (AFM). The combination of the latter provided evidence for the different affinities of the proteins with the films. It was found that BSA and lysozyme form rigid layers on the surface with surface coverage close to 30%, and that both protein layers decrease their thickness after their dehydration. Finally, cell culture experiments exhibited a good viability of the fibroblasts compared to ultra-low adhesion surfaces, which makes them potential candidates for biomedical applications.
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