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Matière Molle
(423) Articles dans des revues
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Solubility and Self-Assembly of Amphiphilic Gradient and Block Copolymers in Supercritical CO2 ![doi link](plugins/aigle//images/ext_link.jpg)
Auteur(s): Ribaut Tiphaine, Oberdisse J., Annighofer Burkhard, Fournel Bruno, Sarrade Stéphane, Haller Heike, Lacroix-Desmazes Patrick
(Article) Publié:
Journal Of Physical Chemistry B, vol. 115 p.836-843 (2011)
Ref HAL: hal-00630034_v1
DOI: 10.1021/jp108888x
WoS: 000286797700008
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27 Citations
Résumé: This work aims at demonstrating the interest of gradient copolymers in supercritical CO2 in comparison with block copolymers. Gradient copolymers exhibit a better solubility in supercritical CO2 than block copolymers, as attested by cloud point data. The self-assembly of gradient and block copolymers in dense CO2 has been characterized by Small-Angle Neutron Scattering (SANS) and it is shown that it is not fundamentally modified when changing from block copolymers to gradient copolymers. Therefore, gradient copolymers are advantageous thanks to their easier synthesis and their solubility at lower pressure while maintaining a good ability for self-organization in dense CO2.
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Ion extraction mechanism studied in a lyotropic lamellar phase ![doi link](plugins/aigle//images/ext_link.jpg)
Auteur(s): Banc A., Bauduin P., Desbat Bernard, Ly Isabelle, Diat Olivier
(Article) Publié:
Journal Of Physical Chemistry B, vol. 115 p.1376-1384 (2011)
Texte intégral en Openaccess : ![openaccess](plugins/aigle//images/logo-openaccess.png)
Ref HAL: hal-00578376_v1
DOI: 10.1021/jp108585f
WoS: 000287066600006
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6 Citations
Résumé: In this paper we used a surfactant-stabilized lyotropic lamellar model system to study the interfacial behaviour of an ion-extracting agent: N1,N3 dimethyl- N1, N3-dibutyl-2-tetradecyl malonamide (DMDBTDMA). An analysis of small angle X-ray scattering (SAXS) and polarized Attenuated Total Reflectance - Fourier Transform Infra Red (ATR-FTIR) data enabled to describe the distribution of the malonamide extractant within the bilayers and its complexation state at the equilibrium. The lamellar phase was diluted with salt water containing varying amount of complexing salt, and each structural state measured was described using a thermodynamic model based on three elementary equilibria: (i) partition of the extractant polar heads between the core and the polar shell of the bilayers, (ii) the complexation of ions by extractants at the bilayers surfaces, and (iii) the partition of bonded extractants between the core and interfaces of bilayers. This model enabled to compare the energy cost of each step.
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Ab-Initio calculations of proline vibrations with and without water, consequences on the infrared spectra of proline-rich proteins ![doi link](plugins/aigle//images/ext_link.jpg)
Auteur(s): Banc A., Desbat Bernard, Cavagnat D.
(Article) Publié:
Applied Spectroscopy, vol. 65 p.817-819 (2011)
Texte intégral en Openaccess :
Ref HAL: hal-00627738_v1
DOI: 10.1366/11-06284
WoS: 000292412500014
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6 Citations
Résumé: The infrared spectra of proline rich proteins display a strong band in the 1450 cm-1 region. In the literature, this band was assigned either to the deformation modes of the CH2 and CH3 groups or to the CN stretching mode of proline residues. In order to establish the correct assignment of this band, the impact of proline vibrations in a polypeptide chain is studied and ab-initio calculations are performed for a model molecule (I) containing a repeat unit of polyproline. A strong band is effectively calculated in the 1450 cm-1 region and mostly assigned to CN stretching whereas, due to the absence of N-H bond, there is no amide II band. These results are in good agreement with the spectral features observed in the FTIR spectra of gliadins. Moreover, the spectral shifts calculated when a water molecule is complexed with (I) are consistent with the hydration effect observed in the experimental data.
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Structural Signature of a Brittle-to-Ductile Transition in Self-Assembled Networks ![doi link](plugins/aigle//images/ext_link.jpg)
Auteur(s): Ramos L., Laperrousaz Arnaud, Dieudonne-George P., Ligoure C.
(Article) Publié:
Physical Review Letters, vol. 107 p.148302 (2011)
Texte intégral en Openaccess : ![arxiv](plugins/aigle//images/logo-arxiv.png)
Ref HAL: hal-00628223_v1
DOI: 10.1103/PhysRevLett.107.148302
WoS: 000296285800029
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13 Citations
Résumé: We study the nonlinear rheology of a novel class of transient networks, made of surfactant micelles of tunable morphology reversibly linked by block copolymers. We couple rheology and time-resolved structural measurements, using synchrotron radiation, to characterize the highly nonlinear viscoelastic regime. We propose the fluctuations of the degree of alignment of the micelles under shear as a probe to identify a fracture process. We show a clear signature of a brittle-to-ductile transition in transient gels, as the morphology of the micelles varies, and provide a parallel between the fracture of solids and the fracture under shear of viscoelastic fluids.
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Continuous droplet interface crossing encapsulation (cDICE) for high throughput monodisperse vesicle design ![doi link](plugins/aigle//images/ext_link.jpg)
Auteur(s): Abkarian M., Loiseau E., Massiera G.
(Article) Publié:
Soft Matter, vol. 7 p.4610-4614 (2011)
Ref HAL: hal-00677371_v1
DOI: 10.1039/c1sm05239j
WoS: 000290227400006
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124 Citations
Résumé: We report on a continuous droplet interface crossing encapsulation (cDICE) technique for the high-yield production of microscopic vesicles tunable in size and content. Overcoming some of the current technique limitations, such a simple setup has a great potential in various fields from encapsulation to the design of biomimetic cells and artificial tissues.
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Nematic-Smectic Transition in Spherical Shells ![doi link](plugins/aigle//images/ext_link.jpg)
Auteur(s): Lopez-Leon T., Fernandez-Nieves Alberto, Nobili M., Blanc C.
(Article) Publié:
Physical Review Letters, vol. 106 p.247802 (2011)
Texte intégral en Openaccess : ![openaccess](plugins/aigle//images/logo-openaccess.png)
Ref HAL: hal-00652863_v1
DOI: 10.1103/PhysRevLett.106.247802
WoS: 000291660000014
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99 Citations
Résumé: We study the nematic-smectic phase transition of a thermotropic liquid crystal confined to a spherical shell. Far from the nematic-smectic phase transition temperature, TNS, we observe a configuration with four þ1=2 defects, as predicted by theory. Since in this case K1 ~~ K3, the four defects are confined at the thinnest part of the shell to minimize the energy associated with the defect cores. By contrast, near TNS, where K3 >> K1, bend distortions become prohibited and the defects organize themselves along a great circle of the sphere, confirming recent theoretical and simulation results. During this structural change, the defects associate in two pairs that behave independently. In the smectic phase, we observe a new configuration displaying curvature walls.
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Influence of Surfactants on Hydrophobically End-Capped Poly(ethylene oxide) Self-Assembled Aggregates Studied by SANS ![doi link](plugins/aigle//images/ext_link.jpg)
Auteur(s): Rufier Chantal, Collet A., Viguier Michel, Oberdisse J., Mora S.
(Article) Publié:
Macromolecules, vol. 44 p.7451-7459 (2011)
Ref HAL: hal-00617696_v1
DOI: 10.1021/ma201150g
WoS: 000295058400043
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11 Citations
Résumé: The rheological properties of associative polymers (APs) are modified by the presence of surfactants, but little is known about the influence of surfactants on the structure of selfassociated aggregates in aqueous media. Using small-angle neutron scattering (SANS), the structure of self-assembled aggregates of a series in concentration of telechelic poly(ethylene oxide) (M ≈ 20 000 g mol 1) end-capped by hydrocarbon or of fluorocarbon groups in the presence of a fixed amount of sodium dodecyl sulfate (SDS) or lithium perfluorooctyl sulfonate (LiFOS) is investigated. In all systems studied, surfactants and telechelic polymers form mixed aggregates. Their aggregation numbers are reduced and evolve with the concentration of each component. For example, with SDS at 8 mM, the mixed aggregates are composed of 1 AP and 15 SDS or 9 APs and 45 SDS molecules for 1 or 3 wt % of polymer, respectively. The addition of a surfactant enhances the number density of aggregates, which causes the increase of the gel viscosity.
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