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Les publications récentes


hal-01510991v1 Article dans une revue
Aurélien Gourrier, Céline Chadefaux, Estelle Lemaitre, Ludovic Bellot-Gurlet, Michael Reynolds et al.
Nanoscale modifications in the early heating stages of bone are heterogeneous at the microstructural scale

Abstract : Nanoscale studies of bone provide key indicators to evidence subtle structural changes that may occur in the biomedical, forensic and archaeological contexts. One specific problem encountered in all those disciplines, for which the identification of nanostructural cues could prove useful, is to properly monitor the effect of heating on bone tissue. In particular, the mechanisms at work at the onset of heating are still relatively unclear. Using a multiscale approach combining Raman microspectroscopy, transmission electron microscopy (TEM), synchrotron quantitative scanning small-angle X-ray scattering imaging (qsSAXSI) and polarized light (PL) microscopy, we investigate the ultrastructure of cortical bovine bone heated at temperatures < 300˚C, from the molecular to the macroscopic scale...
PLoS ONE, Public Library of Science, 2017, 12 (4), pp.e0176179. <10.1371/journal.pone.0176179>

hal-01466180v1 Article dans une revue
Marie Albéric, Mason Dean, Aurélien Gourrier, Wolfgang Wagermaier, John Dunlop et al.
Relation between the Macroscopic Pattern of Elephant Ivory and Its Three-Dimensional Micro-Tubular Network

Abstract : Macroscopic, periodic, dark and bright patterns are observed on sections of elephant tusk, in the dentin part (ivory). The motifs—also called Schreger pattern—vary depending on the orientation in the tusk: on sections perpendicular to the tusk axis, a checkerboard pattern is present whereas on sections longitudinal to it, alternating stripes are observed. This pattern has been used to identify elephant and mammoth ivory in archeological artifacts and informs on the continuous tissue growth mechanisms of tusk. However, its origin, assumed to be related to the 3D structure of empty microtubules surrounded by the ivory matrix has yet to be characterized unequivocally...
PLoS ONE, Public Library of Science, 2017, 12 (1), pp.e0166671. <10.1371/journal.pone.0166671>

hal-01479122v1 Article dans une revue
A. Genevey, D. Kondopoulou, P. Pétridis, E. Aidona, A. Muller et al.
New constraints on geomagnetic field intensity variations in the Balkans during the Early Byzantine period from ceramics unearthed at Thasos and Delphi, Greece

Abstract : We report on five new archeomagnetic field intensity data obtained in Greece from groups of pottery fragments precisely dated to between the middle of the fourth century and the beginning of the seventh century CE. These potsherds were unearthed on the islands of Thasos (Northern Greece) and Delphi (Central Greece). Their dating is primarily ensured by typo-morphological arguments, combined with archeological and historical constraints. Archeointensity measurements were performed using the Triaxe protocol, which involves continuous magnetization measurements at high temperatures and which allows us to overcome the thermoremanent magnetization anisotropy and cooling rate effects...
Journal of Archaeological Science: Reports, Elsevier, 2017, <10.1016/j.jasrep.2017.01.014>


hal-01526673v1 Poster
Guillaume Laurent, Florence Babonneau
NMR safeguarding plan in case of major flooding of the Seine river

Résumé : Le site de Jussieu de Sorbonne Universités – Université Pierre et Marie Curie se situe en bordure de la Seine et risque d’être fortement impacté en cas de crue majeure du fleuve. Quatorze spectromètres de Résonance Magnétique Nucléaire (RMN) se trouvent dans cette faculté, pour un coût total de 7 M€. Deux éléments sont à protéger: l’électronique et le cryoaimant. En effet, la noyade de l’électronique entraînera sa destruction et l’absence de fourniture en fluides cryogéniques engendrerait un coût de 40 k€ par appareil. En Juin 2016, la Seine a connu une crue suffisante pour entrainer des perturbations dans les transports en commun de Paris. Toutefois il ne s’agissait que d’une crue mineure. Comment protéger le matériel en cas de crue majeure ? Dans cette communication, nous verrons l’historique des crues, leur mesure, leurs effets sur les RMN et les mesures préventives à mettre en œuvre, en lien avec le service technique et le service des basses températures de l’université.
XXIXème Congrès du Groupement d’Études de Résonance Magnétique, May 2017, Aussois, France.

hal-01520211v1 Article dans une revue
Moreno Marcellini, Francisco M. Fernandes, Dmytro Dedovets, Sylvain Deville
Water/ice phase transition: The role of zirconium acetate, a compound with ice-shaping properties

Abstract : Few compounds feature ice-shaping properties. Zirconium acetate is one of the very few inorganic compounds reported so far to have ice-shaping properties similar to that of ice-shaping proteins, encountered in many organisms living at low temperature. When a zirconium acetate solution is frozen, oriented and perfectly hexagonal ice crystals can be formed and their growth follows the temperature gradient. To shed light on the water/ice phase transition while freezing zirconium acetate solution, we carried out differential scanning calorimetry measurements. From our results, we estimate how many water molecules do not freeze because of their interaction with Zr cations. We estimate the colligative properties of the Zr acetate on the apparent critical temperature. We further show that the phase transition is unaffected by the nature of the base which is used to adjust the pH. Our results provide thus new hints on the ice-shaping mechanism of zirconium acetate.
Journal of Chemical Physics, American Institute of Physics, 2017, 146 (14), pp.144504. <10.1063/1.4979845>

hal-01510238v1 Article dans une revue
Ronghua Li, Mickael Boudot, Cédric Boissière, David Grossoleil, Marco Faustini
Suppressing Structural Colors of Photocatalytic Optical Coatings on Glass: The Critical Role of SiO2

Abstract : The appearance of structural colors on coated-glass is a critical esthetical drawback toward industrialization of photocatalytic coatings on windows for architecture or automobile. Herein we describe a rational approach to suppress the structural color of mesoporous TiO2-based coatings preserving photoactivity and mechanical stiffness. Addition of SiO2 as third component is discussed. TixSi(1-x)O2 mesoporous coatings were fabricated by one-step liquid deposition process through the evaporation induced self-assembling and characterized by GI-SAXS, GI-WAXS, electron microscopies, and in situ Environmental Ellipsometry Porosimetry...
ACS Applied Materials & Interfaces, Washington, D.C. : American Chemical Society, 2017, 9 (16), pp.14093-14102. <10.1021/acsami.7b02233>


hal-01447459v1 Article dans une revue
Jean-Yvon Faou, Sergey Grachev, Etienne Barthel, Guillaume Parry.
From telephone cords to branched buckles: A phase diagram

Abstract : Thin films with low adhesion and large residual stresses may buckle and delaminate from their substrates. This delamination often results in oscillating patterns known as ‘telephone cords’. Other configurations can be observed as well, such as entangled networks of blisters. The present study aims at elucidating how these networks are generated through branching. A model coupling a geometrically non-linear plate model and a cohesive zone with mode dependent interfacial toughness is used. Previous work on the early stage delamination of initially circular blisters during interfacial crack front propagation are revisited and extended to the remote post-critical regime to capture front branching. We also build a partial phase diagram of buckling driven delamination morphologies. An intrinsic critical stress parameter is proposed which can be used to predict delamination morphology and to define ‘safe’ conditions where buckle propagation can be avoided. This critical stress also defines an intrinsic lengthscale which plays the role of a minimum nucleation size
Acta Materialia, Elsevier, 2017, 125, pp.524 - 531. <10.1016/j.actamat.2016.12.025>

hal-01474074v1 Article dans une revue
Giulia Gelardi, Nicolas Sanson, Gergely Nagy, Robert Flatt.
Characterization of Comb-Shaped Copolymers by Multidetection SEC, DLS and SANS

Abstract : PolyCarboxylate ether-based superplasticizers (PCEs) are a type of comb-shaped copolymers used as polymeric dispersants in cementitious materials. PCEs have a high degree of dispersity, which limits the suitability of conventional characterization techniques, such as Size Exclusion Chromatography (SEC). Properties of PCEs strongly depend on their molecular structure and a comprehensive characterization is needed to fully understand the structure–property relationships. PCEs with well-defined molecular structures were synthesized to study their solution conformation by SEC and scattering techniques. The combined use of SEC, dynamic light scattering and small-angle neutron scattering allowed us to demonstrate the validity of a scaling law describing the radius of gyration of comb-shaped copolymers as a function of their molecular structure. Moreover, we show that the use of SEC with standard calibration, although widely spread, is not adequate for PCEs
Polymers, MDPI, 2017, 9 (2), pp.61. <10.3390/polym9020061>

hal-01474323v1 Article dans une revue
Laure Bluteau, Maurice Bourrel, Nicolas Passade-Boupat, Laurence Talini, Emilie Verneuil et al.
Water film squeezed between oil and solid: drainage towards stabilization by disjoining pressure

Abstract : The spontaneous drainage of aqueous solutions of salt squeezed between an oil drop and a glass surface is studied experimentally. The thickness profile of the film is measured in space and time by reflection interference microscopy. As the film thins down, three regimes are identified: a capillary dominated regime, a mixed capillary and disjoining pressure regime, and a disjoining pressure dominated regime. These regimes are modeled within the lubrication approximation, and the role of the disjoining pressure is precisely investigated in the limit of thicknesses smaller than the range of electrostatic interactions. We derive simple analytical laws describing the drainage dynamics, thus providing tools to uncouple the effect of the film geometry from the effects of the disjoining or capillary pressures.
Soft Matter, Royal Society of Chemistry, 2017, 13 (7), pp.1384 - 1395. <10.1039/C6SM02423H>


hal-01517346v1 Article dans une revue
Zahid Raja, Sonia André, Feten Abbassi, Vincent Humblot, Olivier Lequin et al.
Insight into the mechanism of action of temporin-SHa, a new broad-spectrum antiparasitic and antibacterial agent

Abstract : Antimicrobial peptides (AMPs) are promising drugs to kill resistant pathogens. In contrast to bacteria, protozoan parasites, such as Leishmania, were little studied. Therefore, the antiparasitic mechanism of AMPs is still unclear. In this study, we sought to get further insight into this mechanism by focusing our attention on temporin-SHa (SHa), a small broad-spectrum AMP previously shown to be active against Leishmania infantum. To improve activity, we designed analogs of SHa and compared the antibacterial and antiparasitic mechanisms. [K3]SHa emerged as a highly potent compound active against a wide range of bacteria, yeasts/fungi, and trypanosomatids (Leishmania and Trypanosoma), with leishmanicidal intramacrophagic activity and efficiency toward antibiotic-resistant strains of S. aureus and antimony-resistant L. infantum...
PLoS ONE, Public Library of Science, 2017, 12 (3), pp.e0174024. <10.1371/journal.pone.0174024>

hal-01512755v1 Article dans une revue
R. Totani, C. Grazioli, T. Zhang, I. Bidermane, J. Lüder et al.
Electronic structure investigation of biphenylene films

Abstract : Photoelectron Spectroscopy (PS) and Near-Edge X-ray Absorption Fine Structure (NEXAFS) spectroscopy have been used to investigate the occupied and empty density of states of biphenylene films of different thicknesses, deposited onto a Cu(111) crystal. The obtained results have been compared to previous gas phase spectra and single molecule Density Functional Theory (DFT) calculations to get insights into the possible modification of the molecular electronic structure in the film induced by the adsorption on a surface. Furthermore, NEXAFS measurements allowed characterizing the variation of the molecular arrangement with the film thickness and helped to clarify the substrate-molecule interaction.
Journal of Chemical Physics, American Institute of Physics, 2017, 146 (5), pp.054705. <10.1063/1.4975104>

hal-01368456v1 Article dans une revue
Karam Jabbour, Pascale Massiani, Anne Davidson, Sandra Casale, Nissrine El Hassan.
Ordered mesoporous “one-pot” synthesized Ni-Mg(Ca)-Al2O3 as effective and remarkably stable catalysts for combined steam and dry reforming of methane (CSDRM)

Abstract : Two series of Nix% (x: 5–10 wt%) and Ni5%M5% (M: Ca or Mg) containing mesoporous Al2O3 catalysts were prepared by “one-pot” synthesis following an evaporation-induced self-assembly (EISA) method. After reduction, the catalysts showed very high Ni dispersion within the structured oxide matrix giving high activities and long-term stabilities in combined steam and dry reforming of methane (CSDRM) carried out at 800 °C. Both the increase of Ni content and the addition of Mg (or Ca) are beneficial to performances, with activity levels reaching the maximum-expected thermodynamic ones for Ni10%Al2O3. In the Mg (or Ca) free catalysts, a relationship between nickel content, reactivity level and carbon deposition is found. Nevertheless, carbon formation is not detrimental to catalytic stability due to formation of carbon nanotubes only outside the nickel containing alumina grains...
Applied Catalysis B: Environmental, 2017, 201, pp.527-542. <10.1016/j.apcatb.2016.08.009>

Fernande Sarrazin (fernande.sarrazin @ - 31/05/17

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