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Physique de systèmes biologiques
(40) Production(s) de l'année 2017
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Phase transfer of TiO2 nanoparticles from water to ionic liquid triggered by phosphonic acid grafting 
Auteur(s): Bhandary R., Alauzun J. G., Hesemann Peter, Stocco A., In M., Mutin P. Hubert
(Article) Publié:
Soft Matter, vol. 13 p.8023 - 8026 (2017)
Ref HAL: hal-01653105_v1
DOI: 10.1039/c7sm01424d
WoS: 000415352100002
Exporter : BibTex | endNote
11 Citations
Résumé: Controlling the interface between TiO2 nanocrystals and ionic liquids is of high fundamental and applied interest for energy storage and conversion devices. Phase transfer of nanoparticles from a synthesis medium to a processing or an application medium plays a significant role in nanotechnology. Here we demonstrate that surface modification with phosphonic acids bearing cationic end-groups can trigger the phase transfer of TiO2 nanoparticles from an aqueous sol to a typical water-immiscible ionic liquid, [Emim][NTf2]. The transfer involves both the grafting of the phosphonic acid moiety and the exchange of the counter ion of the cationic end-group by NTf2 anions, as demonstrated by solid-state NMR, elemental analysis and independent grafting and ion exchange experiments. Furthermore, the colloidal stability of the TiO2 sols in [Emim][NTf2] strongly depends on the hydrophobic character of the cationic end-groups.
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Janus Colloids Actively Rotating on the Surface of Water
Auteur(s): Wang X., In M., Blanc C., Würger Aloïs, Nobili M., Stocco A.
(Article) Publié:
Langmuir, vol. 33 p.13766 - 13773 (2017)
Texte intégral en Openaccess : 
Ref HAL: hal-01664755_v1
DOI: 10.1021/acs.langmuir.7b02353
WoS: 000416877600006
Exporter : BibTex | endNote
21 Citations
Résumé: Biological or artificial microswimmers move performing trajectories of different kinds such as rectilinear, circular, or spiral ones. Here, we report on circular trajectories observed for active Janus colloids trapped at the air−water interface. Circular motion is due to asymmetric and nonuni form surface properties of the particles caused by fabrication. Motion persistence is enhanced by the partial wetted state of the Janus particles actively moving in two dimensions at the air−water interface. The slowing down of in plane and out of plane rotational diffusions is described and discussed.
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Brittel facture of Polymer Networks
Auteur(s): Arora S., Shaabir A., Hassager O., Ligoure C., Ramos L.
Conference: Suponlen Final Conference: Structureanddynamicsof associatingpolymersandsupramolecular assem (Heraklion, GR, 2017-09-20)
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Impact of drops and balls : Spread, Bounce or Burst of Soft Matter sheets
Auteur(s): Ligoure C.
(Séminaires)
University of Crete (Heraklion, GR), 2017-12-05
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Brittle fracture of polymer transient networks
Auteur(s): Arora S., Shabbir A., Hassager O., Ligoure C., Ramos L.
(Article) Publié:
Journal Of Rheology / Transactions Of The Society Of Rheology; Society Of Rheology -- Transactions, vol. 61 p.1267-1275 (2017)
Texte intégral en Openaccess : 
Ref HAL: hal-01636998_v1
Ref Arxiv: 1711.05777
DOI: 10.1122/1.4997587
WoS: 000414273200022
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
5 Citations
Résumé: We study the fracture of reversible double transient networks, constituted of water suspensions of entangled surfactant wormlike micelles reversibly linked by various amounts of telechelic polymers. We provide a state diagram that delineates the regime of fracture without necking of the filament from the regime where no fracture or break-up has been observed. We show that filaments fracture when stretched at a rate larger than the inverse of the slowest relaxation time of the networks. We quantitatively demonstrate that dissipation processes are not relevant in our experimental conditions and that, depending on the density of nodes in the networks, fracture occurs in the linear viscoelastic regime or in a non-linear regime. In addition, analysis of the crack opening profiles indicates deviations from a parabolic shape close to the crack tip for weakly connected networks. We demonstrate a direct correlation between the amplitude of the deviation from the parabolic shape and the amount of non linear viscoelasticity.
Commentaires: . Réf Journal: Journal of Rheology 61(6), 1267-1275, 2017
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critical conditions for encapsulation by interface crossing at high inertia
Auteur(s): El Itawi Hassan, Lalanne Benjamin, Masbernat Olivier, In M., Phou T., Fromental J.-M., Massiera G., Le Sauze Nathalie
(Affiches/Poster)
25th international conference on bioencapsulation (nantes, FR), 2017-07-03
Ref HAL: hal-01631426_v1
Exporter : BibTex | endNote
Résumé: Our project is focused on the development of a continuous encapsulation process based on the crossing of an interface by droplets of an active ingredient that have to be encapsulated. The aqueous drops are injected in an organic phase, and as the system rotates each drop is driven outwards until it reaches the interface. Under adequate conditions, it crosses the interface and at a high inertia it drives a volume of organic phase which constitutes the coating
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