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Matière Molle
(423) Articles dans des revues
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Deuteration-Induced Volume Phase Transition Temperature Shift of PNIPMAM Microgels ![doi link](plugins/aigle//images/ext_link.jpg)
Auteur(s): Cors M., Wiehemeier Lars, Oberdisse J., Hellweg Thomas
(Article) Publié:
Polymers, vol. 11 p.620 (2019)
Texte intégral en Openaccess : ![openaccess](plugins/aigle//images/logo-openaccess.png)
Ref HAL: hal-02092623_v1
DOI: 10.3390/polym11040620
WoS: 000467312900049
Exporter : BibTex | endNote
5 Citations
Résumé: The effect of deuteration on the volume phase transition (VPT) temperature of poly (N-isopropylmethacrylamide) (pNIPMAM) microgels in aqueous suspension is determined via IR spectroscopy and size measurements by photon correlation spectroscopy (PCS). We study the effect of a hydrogenated and a deuterated solvent ($H_{2}O/D_{2}O), and of the hydrogenated and (partially) deuterated monomer. Deuteration of the monomer or copolymerization with deuterated monomers shifts the volume phase transition temperature (VPTT) by up to 8.4 K to higher temperatures, in good agreement with known results for pNIPAM microgels. Moreover, the shape of the swelling curve is found to depend on deuteration, with the highest deuteration leading to the sharpest VPT. Finally, the quantitative agreement between FTIR spectroscopy and PCS evidences the spatial homogeneity of the microgel particles. Our results are rationalized in terms of the effect of deuteration on hydrogen bonding. They shall be of primary importance for any experimental measurements close to the VPT involving isotopic substitution, and in particular contrast variation small angle neutron scattering.
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Bronchial Epithelial Calcium Metabolism Impairment in Smokers and Chronic Obstructive Pulmonary Disease Decreased ORAI3 Signaling ![doi link](plugins/aigle//images/ext_link.jpg)
Auteur(s): Petit Aurelie, Knabe Lucie, Khelloufi Kamel, Jory M., Gras Delphine, Cabon Yann, Begg Malcolm, Richard Sylvain, Massiera G., Chanez Pascal, Vachier Isabelle, Bourdin Arnaud
(Article) Publié:
American Journal Of Respiratory Cell And Molecular Biology, vol. 61 p.501-511 (2019)
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Mucus Microrheology Measured on Human Bronchial Epithelium Culture ![doi link](plugins/aigle//images/ext_link.jpg)
Auteur(s): Jory M., Bellouma Karim, Blanc C., Casanellas Vilageliu L., Petit Aurelie, Reynaud Paul, Vernisse Charlotte, Vachier Isabelle, Bourdin Arnaud, Massiera G.
(Article) Publié:
Frontiers In Physics, vol. 7 p.19 (2019)
Texte intégral en Openaccess : ![openaccess](plugins/aigle//images/logo-openaccess.png)
Ref HAL: hal-02025486_v1
DOI: 10.3389/fphy.2019.00019
WoS: WOS:000459130800002
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1 Citation
Résumé: We describe an original method to measure mucus microrheology on human bronchial epithelium culture using optical tweezers. We probed rheology on the whole thickness of mucus above the epithelium and showed that mucus gradually varies in rheological response, from an elastic behavior close to the epithelium to a viscous one far away. Microrheology was also performed on mucus collected on the culture, on ex vivo mucus collected by bronchoscopy, and on another epithelium model. Differences are discussed and are related to mucus heterogeneity, adhesiveness and collection method.
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Rotational diffusion of partially wetted colloids at fluid interfaces ![doi link](plugins/aigle//images/ext_link.jpg)
Auteur(s): Stocco A., Chollet B., Wang X., Blanc C., Nobili M.
(Article) Publié:
Journal Of Colloid And Interface Science, vol. 542 p.363-369 (2019)
Texte intégral en Openaccess :
Ref HAL: hal-02024615_v1
DOI: 10.1016/j.jcis.2019.02.017
WoS: 000461536400040
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10 Citations
Résumé: Hypothesis: Rotational Brownian diffusions of colloidal particles at a fluid interface play important roles in particle self-assembly and in surface microrheology. Recent experiments on translational Brownian motion of spherical particles at the air-water interface show a significant slowing down of the translational diffusion with respect to the hydrodynamic predictions (Boniello et al., 2015). For the rotational diffusions of partially wetted colloids, slowing down of the particle dynamics can be also expected.Experiments: Here, the rotational dynamics of Janus colloids at the air-water interface have been experimentally investigated using optical microscopy. Bright field and fluorescent microscopies have been used to measure the in-plane and out-of-plane particle rotational diffusions exploiting the Janus geometry of the colloids we fabricated.Findings: Our results show a severe slowing down of the rotational diffusion Dr,⊥ connected to the contact line motion and wetting-dewetting dynamics occurring on particle regions located at opposite liquid wedges. A slowing down of the particle rotational diffusion about an axis parallel to the interfacial normal Dr,|| was also observed. Contact line fluctuations due to partial wetting dynamics lead to a rotational line friction that we have modelled in order to describe our results.
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pH-mediated control over the mesostructure of ordered mesoporous materials templated by polyion complex micelles ![doi link](plugins/aigle//images/ext_link.jpg)
Auteur(s): Molina Emilie, Mathonnat M., Richard Jason, Lacroix-Desmazes Patrick, In M., Dieudonne-George P., Cacciaguerra Thomas, Gerardin Corine, Marcotte Nathalie
(Article) Publié:
Beilstein Journal Of Nanotechnology, vol. 10 p.144-156 (2019)
Texte intégral en Openaccess : ![openaccess](plugins/aigle//images/logo-openaccess.png)
Ref HAL: hal-01992289_v1
DOI: 10.3762/bjnano.10.14
WoS: 000455446300001
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2 Citations
Résumé: Ordered mesoporous silica materials were prepared under different pH conditions by using a silicon alkoxide as a silica source and polyion complex (PIC) micelles as the structure-directing agents. PIC micelles were formed by complexation between a weak poly-acid-containing double-hydrophilic block copolymer, poly(ethylene oxide)-b-poly(acrylic acid) (PEO-b-PAA), and a weak poly-base, oligochitosan-type polyamine. As both the micellization process and the rate of silica condensation are highly dependent on pH, the properties of silica mesostructures can be modulated by changing the pH of the reaction medium. Varying the materials synthesis pH from 4.5 to 7.9 led to 2D-hexagonal, wormlike or lamellar mesostructures, with a varying degree of order. The chemical composition of the as-synthesized hybrid organic/inorganic materials was also found to vary with pH. The structure variations were discussed based on the extent of electrostatic complexing bonds between acrylate and amino functions and on the silica condensation rate as a function of pH.
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Swelling behaviour of core-shell microgels in H2O, analysed by temperature-dependent FTIR spectroscopy ![doi link](plugins/aigle//images/ext_link.jpg)
Auteur(s): Wiehemeier Lars, Cors M., Wrede Oliver, Oberdisse J., Hellweg Thomas, Kottke Tilman
(Article) Publié:
Physical Chemistry Chemical Physics, vol. 21 p.572-580 (2019)
Ref HAL: hal-01985848_v1
DOI: 10.1039/c8cp05911j
WoS: WOS:000454922300002
Exporter : BibTex | endNote
10 Citations
Résumé: Stimuli-responsive microgels are colloidal particles and promising candidates for applications such as targeted drug delivery, matrices for catalysts, nanoactuators and smart surface coatings. To tailor the response, the architecture of microgels is of paramount importance with respect to these applications. Statistical copolymer microgels based on N-isopropylmethacrylamide (NiPMAM) and N-n-propylacrylamide (NnPAM) show a cooperative phase transition leading to a collapse at a specific temperature. Interestingly, some core-shell microgel particles reveal a linear response of the hydrodynamic radius with temperature. Such observations were made by photon correlation spectroscopy (PCS), which is limited to the diffusion properties dominated by the particle shell. In this work we investigate the molecular hydration within the network of microgels in H2O by temperature-dependent FTIR spectroscopy. The phase transition temperature wasdetermined by the shift in frequency of the NH bending vibration in homopolymer and statistical copolymer microgels and the results are in accordance with those from PCS. In contrast, experiments on core-shell particles show a broadening and shift of the respective phase transition temperatures of core and shell indicating an interaction of core and shell polymers on a molecular level that extends far into the core. In conclusion, temperature-dependent FTIR spectroscopy is a convenient approach to elucidate the internal architecture of complex microgel particles in H2O.
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Probing shear-induced rearrangements in Fourier space. I. Dynamic light scattering ![doi link](plugins/aigle//images/ext_link.jpg)
Auteur(s): Aime S., Cipelletti L.![Auteur correspondant (Corresp.)](plugins/aigle//images/corresponding.gif)
(Article) Publié:
Soft Matter, vol. 15 p.200-212 (2019)
Texte intégral en Openaccess : ![arxiv](plugins/aigle//images/logo-arxiv.png)
Ref HAL: hal-01982836_v1
DOI: 10.1039/c8sm01563e
WoS: WOS:000454947400016
Exporter : BibTex | endNote
5 Citations
Résumé: Understanding the microscopic origin of the rheological behavior of soft matter is a long-lastingendeavour. While early efforts concentrated mainly on the relationship between rheology and structure,current research focuses on the role of microscopic dynamics. We present in two companion papers athorough discussion of how Fourier space-based methods may be coupled to rheology to shed light onthe relationship between the microscopic dynamics and the mechanical response of soft systems. In thisfirst companion paper, we report a theoretical, numerical and experimental investigation of dynamiclight scattering coupled to rheology. While in ideal solids and simple viscous fluids the displacement fieldunder a shear deformation is purely affine, additional non-affine displacements arise in many situationsof great interest, for example in elastically heterogeneous materials or due to plastic rearrangements.We show how affine and non-affine displacements can be separately resolved by dynamic lightscattering, and discuss in detail the effect of several non-idealities in typical experiments.
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