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9. Zinc phosphate chain length study under high hydrostatic pressure by Raman spectroscopy

Author

Gauvin, M., Dassenoy, F., Minfray, C., Martin, J.M., Montagnac, G., and Reynard, B.

Subjects
Raman spectroscopy -- Usage, Phosphates -- Chemical properties, Phosphates -- Mechanical properties, Zinc compounds -- Mechanical properties, Zinc compounds -- Chemical properties, Phase transformations (Statistical physics) -- Research, Physics
Abstract

A diamond anvil is combined with an in-situ Raman spectroscopy technique to analyze the effect of pure pressure on the length of zinc phosphate chains in an antiwear film under extremely high hydrostatic pressure. The results show that high hydrostatic pressure leads to an extremely long phosphate chains, as the structure of the samples becomes less ordered due to the phase transitions.

Published
2007

15. Nanoscale bimetallic CoxPt1-x particles dispersed in poly(vinylpyrrolidone): synthesis from organometallic precursors and characterization

Author

Ely, T. Ould, Pan, Cheng, Amiens, C., Chaudret, B., Dassenoy, F., Lecante, P., Casanove, M.-J., Mosset, A., Broto, J.-M., and Respaud, M.

Subjects
Laminated metals -- Research, Organometallic chemistry -- Research, Chemicals, plastics and rubber industries
Abstract

It has been possible to demonstrate the synthesis of CoxPt1-x particles of nanometric size dispersed in an inert organic matrix through the simultaneous decomposition of the organometallic precursors Co(eta3-C8H13)(eta4-C8H12) and Pt2(dba)3 in solution in mild conditions.

Published
2000

19. Tribocatalytic behaviour of a TiO 2 atmospheric plasma spray (APS) coating in the presence of the friction modifier MoDTC: a parametric study

Author

Deshpande, P., Minfray, Clotilde, Dassenoy, F., Le Mogne, T., Jose, D., COBIAN, M., THIEBAUT, B., Laboratoire de Tribologie et Dynamique des Systèmes (LTDS), École Centrale de Lyon (ECL), and Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Ecole Nationale d'Ingénieurs de Saint Etienne-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.ANAL]Chemical Sciences/Analytical chemistry, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], [CHIM.MATE]Chemical Sciences/Material chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018
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20. Pressure-induced exfoliation of inorganic fullerene-like WS2 particles in a Hertzian contact.

Author

Joly-Pottuz, L., Martin, J. M., Dassenoy, F., Belin, M., Montagnac, G., Reynard, B., and Fleischer, N.

Subjects
PRESSURE, NANOPARTICLES, PARTICLES, TRANSMISSION electron microscopy, TEMPERATURE, HYDROSTATIC pressure
Abstract

Nanoparticles are potential additives for the improvement of lubricant properties, because of the structural modifications they undergo under high pressures in mechanical contacts. The behavior of inorganic fullerene-like WS2 nanoparticles (IF-WS2) under high isotropic pressures of up to 20 GPa generated in a diamond anvil cell was studied and compared to the response of the lamellar 2H phase of WS2. The same materials were then subjected to static uniaxial pressures in a Hertzian contact in the GPa range. The evolution of the particles as a function of pressure was studied by in situ Raman spectroscopy and transmission electron microscopy at the end of the test. Data analysis shows that IF-WS2 particles resist high hydrostatic pressures well, but they are totally exfoliated by uniaxial compression in a Hertzian contact under low pressure. These results explain the excellent tribological properties at ambient temperature of IF-WS2 nanolubricant that have previously been attributed to the nested nanospheres during the friction process but whose origin had not been clearly identified. [ABSTRACT FROM AUTHOR]

Published
2006
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21. Pressure-induced exfoliation of inorganic fullerene-like WS2 particles in a Hertzian contact

Author

Joly-Pottuz, L., Martin J.M., Dassenoy, F., Belin, M., Montagnac, G., Reynard, B., and Fleischer, N.

Subjects
Inorganic compounds -- Spectra, Hydrostatic pressure -- Observations, Physics
Abstract

Data-analysis shows that inorganic fullerene like WS2 particles resist high hydrostatic pressures well, but they are totally exfoliated by uniaxial compression in a Hertzian contact under low pressure. These results reveals that excellent tribological properties at ambient temperature of IF-WS2 nanolubricant that were previously attributed to the nested nanospheres during the friction process but whose origin was not clearly defined.

Published
2006

28. Size and composition effects in polymer-protected ultrafine bimetallic Pt x Ru 1 − x ( 0 < x < 1 ) particles

Author

Dassenoy, F., Casanove, Marie-José, Lecante, Pierre, Pan, C., Philippot, Karine, Amiens, Catherine, Chaudret, Bruno, Laboratoire de Tribologie et Dynamique des Systèmes (LTDS), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Ecole Nationale d'Ingénieurs de Saint Etienne-Centre National de la Recherche Scientifique (CNRS), Centre d'élaboration de matériaux et d'études structurales (CEMES), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT-FR 2599), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Surfaces, Interfaces et Nano-Objets (CEMES-SINanO), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Laboratoire de chimie de coordination (LCC), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique et chimie des nano-objets (LPCNO), Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie de Toulouse (ICT-FR 2599), Université Fédérale Toulouse Midi-Pyrénées, Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut de Chimie de Toulouse (ICT), Université de Toulouse (UT)-Institut de Recherche sur les Systèmes Atomiques et Moléculaires Complexes (IRSAMC), and Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2001
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33. Friction Reduction Benefits in Valve-Train System Using IF-MoS 2 Added Engine Oil.

Author

Sgroi, M., Gili, F., Mangherini, D., Lahouij, I., Dassenoy, F., Garcia, I., Odriozola, I., and Kraft, G.

Subjects
INTERNAL combustion engine lubrication, AUTOMOBILE engine oil filter maintenance & repair, AUTOMOBILE engine maintenance & repair, ENGINE valve manufacturing, AUTOMOBILE engines (Diesel), X-ray photoelectron spectroscopy
Abstract

The development of new advanced lubricants is a key factor for the production of cleaner and more durable internal combustion engines. New improved antifriction and antiwear additives are required. The inclusion of nanoparticles known as solid lubricants (MoS2 and WS2 inorganic fullerenes) in fully formulated engine oils could help to improve the performance of the lubricant and of the engine. The AddNano Consortium, partially funded by the European Commission, investigated the possibility of including inorganic fullerenes in the formulation of engine oils. MoS2 nanoparticles integrated in the additive package of an SAE 5W30 engine oil showed a 50% reduction in the coefficient of friction in tribological lab-scale experiments. The nano-oil was formulated by modifying the additive package in order to stably disperse the nanoparticles and avoid counterproductive interactions with the other components of the package (antifoam, antioxidant, detergents, antiwear and antifriction additives). In the present work, characterization of the nanolubricants on a bench test simulating the real tribological conditions encountered in the valve-train of a diesel engine is reported. transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) were used to characterize the nanoparticles and the rubbed surfaces. [ABSTRACT FROM AUTHOR]

Published
2015
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39. Solution synthesis of core–shell Co9S8@MoS2catalystsElectronic supplementary information (ESI) available. See DOI: 10.1039/c6cy00311g

Author

Hadj-Aïssa, A., Dassenoy, F., Geantet, C., and Afanasiev, P.

Abstract

Core–shell Co9S8@MoS2unsupported catalysts have been prepared by a solution reaction in ethylene glycol. First, using a cobalt sulfide seed, amorphous core–shell CoS@MoSx(x= 3–4) was prepared. Then, after thermal treatment, 20–50 nm-sized particles were obtained, in which MoS2was crystallized at the exterior of the Co9S8core. The solids show high catalytic activity in hydrodesulphurization, with an exceptionally high thermal stability. Thus, the high catalytic activity was preserved even after thermal treatment at 750 °C. A symmetric synergy model has been proposed with the catalytic sites located at the interface between the cobalt sulfide crystallites and the stacks of MoS2slabs.

Published
2016
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40. Synthesis and investigations of rutile phase nanoparticles of TiO2.

Author

Borse, Pramod, Kankate, Laxman, Dassenoy, F., Vogel, W., Urban, J., and Kulkarni, Sulabha

Abstract

TiO2 nanoparticles have been synthesized at room temperature using a simple chemical precipitation route. Particles were further coated with polymer. Detailed structural analysis of the particles has been carried out. Wide-angle X-ray scattering (WAXS) and transmission electron microscopy (TEM) confirm that “as-synthesized” particles as well as annealed particles are nanoparticles having pure rutile phase. Thermal annealing at 1000 °C of 4.2 nm particles led to an increased size ∼20 nm in the same phase. The purity and composition of the particles were determined using energy dispersive analysis of X-rays (EDAX) and X-ray photoelectron spectroscopy (XPS), respectively. [ABSTRACT FROM AUTHOR]

Published
2002
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41. Structural Studies and Stability of Cluster-like Ru<INF>x</INF><INF></INF>Se<INF>y</INF><INF></INF> Electrocatalysts

Author

Dassenoy, F., Vogel, W., and Alonso-Vante, N.

Abstract

Structural studies and stability of cluster-like particles of Rux and RuxSey were performed in situ via X-ray diffraction at wide angles (WAXS). Both materials have a similar particle size (1.4−1.6 nm) in the reduced state. Whereas Rux particles are rather sensitive to oxygen from air, the chemical stabilization, against oxidation, of such metallic centers is obtained by the coordination of selenium atoms. The role of selenium atoms is also to stabilize the nanostructural nature (geometric effect) of the compound, as demonstrated by the temperature measurements (up to 300 °C) in the gas phase, and to provide the electronic effect for electrocatalysis.

Published
2002
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42. Nanoscale Bimetallic Co<INF>x</INF><INF></INF>Pt<INF>1</INF><INF>-</INF><INF>x</INF><INF></INF> Particles Dispersed in Poly(vinylpyrrolidone): Synthesis from Organometallic Precursors and Characterization

Author

Ely, T. O., Pan, C., Amiens, C., Chaudret, B., Dassenoy, F., Lecante, P., Casanove, M.-J., Mosset, A., Respaud, M., and Broto, J.-M.

Abstract

The reaction of Co(η3-C8H13)(η4-C8H12) and Pt2(dba)3 (dba = bis-dibenzylidene acetone) under dihydrogen leads in the presence of poly(vinylpyrrolidone) to nanometric bimetallic particles CoxPt1-x. The composition of the material is determined by the initial ratio of the two organometallic precursors. The bimetallic character of the particles is evidenced by magnetic, structural, and spectroscopic studies. Structural changes are evidenced both by HREM and WAXS:  platinum rich particles adopt a fcc crystalline structure while cobalt rich particles adopt a non periodic polytetraedral arrangement. The magnetic properties of the materials have been investigated. ZFC/FC measurements show that the particles are superparamagnetic and that their size dispersity is very low. From isothermal magnetization measurements, the extrapolated value of the coercive field HC (T = 0) is shown to increase continuously with Pt concentration, which is characteristic of bimetallic particles.

Published
2000

43. A New Synthetic Method toward Bimetallic Ruthenium Platinum Nanoparticles; Composition Induced Structural Changes

Author

Pan, C., Dassenoy, F., Philippot, K., Amiens, C., Lecante, P., Mosset, A., Casanove, M.-J., and Chaudret, B.

Abstract

The reaction of Pt(dba)2 with Ru(COD)(COT) in various proportions under dihydrogen in the presence of PVP leads to the formation of bimetallic nanoparticles of definite compositions resulting from the relative concentration of the two complexes in the initial solution. The progressive incorporation of ruthenium into the platinum matrix leads to structural changes from face-centered cubic (fcc) for high platinum contents to hexagonal close-packed (hcp) for high ruthenium contents. For the composition Pt1Ru3 a contraction of the size of the particles (ca. 1.1 nm) and of the size distribution indicates the presence of a new phase consisting of monodisperse particles for which a model of truncated twinned octahedrons of 79 atoms was proposed.

Published
1999

44. Influence of the Organic Moiety on the Tribological Properties of MoS2:Glycol Hybrid Nanoparticles-Based Dispersions.

Author

García, I., Galipaud, J., Kosta, I., Grande, H., Garcia-Lecina, E., and Dassenoy, F.

Abstract

MoS2:glycol hybrid nanoparticles were synthetized through a polyol route. Their tribological properties when used as lubricant additives in a PAO 6 base oil were investigated using a pin-on-disk tribometer. An important friction reduction and good anti-wear performances were observed compared to the base oil and to the no modified particles. The MoS2:glycol nanoparticles were characterized by thermogravimetric analysis, transmission electron microscopy, RAMAN spectroscopy, X-ray diffraction, and Fourier transform infrared. Furthermore, the stability of the dispersion was followed by dynamic light scattering. On the other hand, Field Emission Scanning Electron Microscopy, Energy-Dispersive X-ray Spectroscopy, and X-ray Photoelectron Spectrometry analysis showed that the tribofilm formed on the wear surfaces during the friction test is at the origin of the excellent tribological performance of the MoS2 nanoparticles. In particular, it was demonstrated that the interaction of MoS2 with the organic moiety of the nanoparticles plays a key role in the friction reduction and the good anti-wear properties of the dispersions. [ABSTRACT FROM AUTHOR]

Published
2020
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