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Production scientifique
(474) Production(s) de l'année 2018
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Mechanical behaviour of aerogels and composite aerogels submitted to specific penetration tests
Auteur(s): Faivre A., Duffours L., Colombel P., Despetis F.
(Article) Publié:
Journal Of Sol-Gel Science And Technology, vol. p. (2018)
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Janus Colloids Actively Moving at the Surface of Water
Auteur(s): Stocco A.
Conference: APS March Meeting 2018 (Los Angeles, US, 2018-03-05)
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Adsorption and structure of wheat proteins film at the air-water interface
Auteur(s): Poirier A., Banc A., Stocco A., In M., Ramos L.
Conference: 3rd Food Structure Functionality Forum Symposium (Montreal, CA, 2018-06-04)
Ref HAL: hal-01912810_v1
Exporter : BibTex | endNote
Résumé: Gliadins are edible wheat storage proteins well known for their surface active properties. In this paper, we present experimental results on the interfacial properties of acidic solutions of gliadin studied over 5 decades of concentrations, from 0.001 to 110 g/L. Dynamic pendant drop tensiometry reveals that the surface pressure of gliadin solutions builds up in a multistep process. The series of curves of the time evolution of collected at different bulk protein concentrations C can be merged onto a single master curve when is plotted as a function of t where t is the time elapsed since the formation of the air/water interface and is a shift parameter that varies with C as a power law with an exponent 2. The existence of such time-concentration superposition, which we evidence for the first time, indicates that the same mechanisms govern the surface tension evolution at all concentrations and are accelerated by an increase of the bulk concentration. The scaling of with C is consistent with a kinetic of adsorption controlled by the diffusion of the proteins in the bulk. Moreover, we show that the proteins adsorption at the air/water interface is kinetically irreversible. Correlated evolutions of the optical and elastic properties of the interfaces, as probed by ellipsometry and surface dilatational rheology respectively, provide a consistent physical picture of the building up of the protein interfacial layer. A progressive coverage of the interface by the proteins occurs at low . This stage is followed, at higher , by conformational rearrangements of the protein film, which are identified by a strong increase of the dissipative viscoelastic properties of the film concomitantly with a peculiar evolution of its optical profile that we have rationalized. In the last stage, at even higher surface pressure, the adsorption is arrested; the optical profile is not modified while the elasticity of the interfacial layer dramatically increases with the surface pressure, presumably due to the film ageing.
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Active and passive colloids confined at the gas-liquid interface
Auteur(s): Stocco A.
Conference: 30th International Conference Science and Technology of Complex Fluids (San Luis Potosi, MX, 2018-06-18)
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Direct Photomodification of Polymer Surfaces: Unleashing the Potential of Aryl-Azide Copolymers
Auteur(s): Schulz Anita, Stocco A., Bethry Audrey, Lavigne Jean-Philippe, Coudane Jean, Nottelet Benjamin
(Article) Publié:
Advanced Functional Materials, vol. 28 p.1800976 (2018)
Texte intégral en Openaccess :
Ref HAL: hal-01909547_v1
DOI: 10.1002/adfm.201800976
WoS: 000439738200010
Exporter : BibTex | endNote
6 Citations
Résumé: The possibility to impart surface properties to any polymeric substrate using a fast, reproducible, and industrially friendly procedure, without the need for surface pretreatment, is highly sought after. This is in particular true in the frame of antibacterial surfaces to hinder the threat of biofilm formation. In this study, the potential of aryl‐azide polymers for photofunctionalization and the importance of the polymer structure for an efficient grafting are demonstrated. The strategy is illustrated with a UV‐reactive hydrophilic poly(2‐oxazoline) based copolymer, which can be photografted onto any polymer substrate that contains carbon–hydrogen bonds to introduce antifouling properties. Through detailed characterization it is demonstrated that the controlled spatial distribution of the UV‐reactive aryl‐azide moieties within the poly(2‐oxazline) structure, in the form of pseudogradient copolymers, ensures higher grafting efficacy than other copolymer structures including block copolymers. Furthermore, it is found that the photografting results in a covalently bound layer, which is thermally stable and causes a significant antiadherence effect and biofilm reduction against Escherichia coli and Staphylococcus epidermidis strains while remaining noncytotoxic against mouse fibroblasts.
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Van der Waals Emulsions: Emulsions Stabilized by Surface-Inactive, Hydrophilic Particles via van der Waals Attraction
Auteur(s): Marina Paula Facal, Cheng Chongling, Sedev Rossen, Stocco A., Binks Bernard, Wang Dayang
(Article) Publié:
Angewandte Chemie International Edition, vol. 57 p.9510 - 9514 (2018)
Texte intégral en Openaccess :
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Studying the growth of single-walled carbon nanotubes by optical means
Auteur(s): Jourdain V.
Conference: MRS Fall Meeting (Boston, US, 2018-11-27)
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