Publications

Nouveauté : Toutes les publications par laboratoires de l’UFR de chimie  regroupées
dans la collection hal.sorbonne-universite.fr/CHIMIE-SU

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Gauvin M., Yang N., Yang Z. et al.

Hierarchical mechanical behavior of cobalt...

Abstract: Here, we report on hierarchical mechanical behavior of 500-nm-thick Co-nanocrystal 3D superlattices (supracrystals) induced by either the crystalline structure (nanocrystallinity) or the length of the coating agent of Co nanocrystals. Increasing the nanocrystal shape anisotropy of Co nanocrystals through the control of their nanocrystallinities induces a higher level of ordering with both translational and orientational alignment of nanocrystals within the supracrystals.

Exporter la référence : DOI: 10.1007/s12274-015-0846-3 (2015)
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Eric S., Matovic V., Kremenovic A. et al.

The origin of Mg sulphate and other salts formed on pure calcium carbonate substrate...

Abstract: Epsomite and hexahydrate occur in the form of efflorescence on the church walls made of pure calcium carbonate – tufa stone. A few sources of magnesium are responsible for the precipitation of Mg-salts at the block surfaces: lime mortar with Mg-rich aggregates, repair lime cement mortar, the dolostone of the rubber core, and the monastery basement composed of Mg-rich rocks. Possible sources of sulphate are: repair lime cement mortar and soil solution. The permanent presence of different solution types in the tufa pore system enabled the precipitation of salts in the following order: calcite/dolomite, gypsum, Mg-sulphate phases, syngenite and blodeite...

Exporter la référence : DOI: 10.1016/j.conbuildmat.2015.08.101
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Upasen S., Batocchi P., Mauvy F. et al.

Chemical and structural stability of La0.6Sr0.4Co0.2Fe0.8O3-delta ceramic vs...

Abstract: During the last decades, perovskite-type oxides have received large attention as potential electrolytes and electrodes for Solid Oxide Fuel Cells (SOFC), including Proton Ceramic Fuel Cells (PCFC), gas separation membranes and High Temperature Steam Electrolysers (HTSE)...

Exporter la référence : DOI:10.1016/j.ceramint.2015.07.035
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Wei J., Schaeffer N., Pileni M.-P.

Ligand Exchange Governs the Crystal Structures in Binary Nanocrystal Superlattices

Abstract: The surface chemistry in colloidal nanocrystals on the final crystalline structure of binary superlattices produced by self-assembly of two sets of nanocrystals is hereby demonstrated. By mixing nanocrystals having two different sizes and the same coating agent, oleylamine (OAM), the binary nanocrystal superlattices that are produced, such as NaCl, AlB2, NaZn13, and MgZn2, are well in agreement with the crystalline structures predicted by the hard-sphere model, their formation being purely driven by entropic forces...

Exporter la référence : DOI: 10.1021/jacs.5b09959 (2015)
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Goubet M., Soulard P., Pirali O. et al.

Standard free energy of the equilibrium between the trans-monomer and the cyclic-dimer...

Abstract: Survey jet-cooled spectra of acetic acid have been recorded in the infrared region (200–4000 cm−1) over a wide range of expansion conditions. From the variations of the relative intensities of the signals, vibrational transitions have been assigned unambiguously to the trans-monomer and cyclic-dimer. The IR-active fundamental frequencies have been determined at the instrumental accuracy of 0.5 cm−1...

Exporter la référence : DOI: 10.1039/c4cp05684a (2015)
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Kameche F., Anh-Tu Ngo, Salzemann C. et al.

Role of the nanocrystallinity on the chemical ordering of CoxPt100-x nanocrystals...

Abstract: CoxPt100−x nanoalloys have been synthesized by two different chemical processes either at high or at low temperature. Their physical properties and the order/disorder phase transition induced by annealing have been investigated depending on the route of synthesis...

Exporter la référence : DOI: 10.1039/c5cp01062d (2015)
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Slodczyk A., Lacroix O., Colomban P.

Water pressure enhanced sintering of alkaline-earth perovskite ceramics

Abstract: The alkaline earth– based perovskite ceramics are potential electrolytes for components of electrolysers, fuel cells and CO2/syngas converters. Their high refractarity is an advantage from the chemical stability point of view but involves high sintering temperature (>1500°C), detrimental in the co-sintering procedure required to assembly device components. Since the presence of protonic species is not intrinsic to the perovskite structure, the Ln – modified perovskites have to be successfully protonated by exposition of dense (95-99% theoretical density) ceramic pieces to (pressurized) water. Water Pressure Enhanced Sintering of Alkaline-Earth....

Exporter la référence : DOI: 10.1016/j.ceramint.2015.05.082
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Nourry S., Zins E.-L., Krim L.

Formation of HNCO from carbon monoxide and atomic nitrogen in their fundamental states...

Abstract: As a simple molecule containing the four main atoms essential for life as we know it, isocyanic acid can be considered as a prebiotic molecule. As such, the understanding of reaction mechanisms leading to its formation is fundamental. Isocyanic acid is present in different physical environments in the medium. Previous studies have suggested that, in water-containing ices, on the surface of dust grains, HNCO may be formed from N and CO in their fundamental states. To further investigate the reaction process, herein we investigate this reaction by means of the matrix-isolation technique.

Exporter la référence : DOI: 10.1039/c4cp03876b (2015)
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Gheorghiu F., Curecheriu L., Lisiecki I. et al.

Functional properties of Sm2NiMnO6 multiferroic ceramics prepared by spark plasma sintering

Abstract: In the present work, it was reported for the first time the new synthesis of Sm2NiMnO6 double perovskite oxides by sol–gel auto-combustion method. The Rietveld analysis of the X-ray ceramics diffraction pattern recorded at room temperature for Sm2NiMnO6 ceramics sintered at 1000 °C/5 min from powders obtained at 700 °C/7 h confirm the formation of the double perovskite with a monoclinic structure and the space group P21/n. The HRTEM analysis shows clear lattice fringes that confirm a high crystallinity level of the material corresponding to the monoclinic structure.

Exporter la référence : DOI: 10.1016/j.jallcom.2015.07.136
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Lepetit C., Poater J., Alikhani, M. E. et al.

The Missing Entry in the Agostic-Anagostic Series: Rh(I)-eta(1)-C Interactions in P(CH)P Pincer Complexes

Abstract: The missing entry, namely, the "C-anagostic" or n1-C interaction, closing the agostic–anagostic series of metal–CH(aryl) interactions is found in a bis(amidiniophosphine) P(CH)P pincer rhodium complex. The three entries, namely, agostic n2-(C,H), anagostic (related to hydrogen bonding, thus recoined here as "H-anagostic") and C-anagostic interactions, are unambiguously characterized by electron localization function (ELF) topological analysis. Other theoretical tools such as noncovalent interaction (NCI) analysis and multicenter electron delocalization indices (MCIs) support the ELF characterization...

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