Publications: Articles
2016 | |
Articles: | |
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Dalton Transactions,
45(Copyright (C) 2016 American Chemical Society (ACS). All Rights Reserved.):1259-1268
2016
Resume: The extn. of rare earth elements (REEs) from nitric acid soln. with a triphosphine trioxide (TPO) is presented. Performances of such a ligand in ionic liqs. vs. a classical solvent (benzyl ether) are compared. TPO seems to be 10 to 100 times more efficient when it is dissolved in ionic media whatever the concn. of nitric acid involved. Mechanistic investigations reveal that cation exchange classically obsd. in ionic liqs. is not consistent with the exptl. data. Moreover, clear differences in the TPO/Ln complexes between classical and ionic media are highlighted. A stable complex of 1 lanthanide for 3 TPO is formed in an ionic liq. whereas a complex of 1 lanthanide for 6 to 9 TPO is formed in benzyl ether. Back extn. is also studied and good recovery of REEs could be obtained. The TPO/ionic liq. system shows remarkable performances i.e. efficiency and selectivity towards lanthanides in a simulated leaching soln. of a Nd/Fe/B/Dy magnet. [on SciFinder(R)] Equipe: Département CP2S : Chimie et électrochimie des matériaux |
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Electrochimica Acta,
2016
Mots clefs: Electrodeposition Nanowires Tellurium Ionic liquid Hollow nanostructures Resume: Abstract Template-free electrodeposition of Te one-dimensional (1 D) nanostructures was carried out from an ionic liquid binary mixture: 1-ethyl-1-octyl-piperidinium bis(trifluoromethylsulfonyl)imide:1-ethyl-1-octyl-piperidinium bromide (EOPipTFSI:EOPipBr 95:5 (mol%)). SAED and XRD analyses confirm the formation of Te 1D nanostructures with a hexagonal single crystalline structure following the [001] direction. A systematic study of the influence of synthesis parameters on the deposits morphology has shown that it is possible to control the shape and the dimensions of the deposited nanostructures. Specifically, the applied potential has a strong influence on the morphology of the deposits. Nanowires or hollow nanostructures can be obtained, depending on mass transport conditions, as confirmed by the use of a soluble anode. Equipe: Département CP2S : Chimie et électrochimie des matériaux |
2015 | |
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Applied Physics Letters,
106(23):233108
2015
Mots clefs: molecular dynamics method phonons thermal conductivity bismuth compounds nanowires Equipe: Département CP2S : Chimie et électrochimie des matériaux |
2014 | |
Articles: | |
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Analytical Chemistry,
86:11217-11225
2014
DOI: 10.1021/ac502774m
Equipe: Département CP2S : Expériences et Simulations des Plasmas Réactifs - Interaction plasma-surface et Traitement des Surfaces ESPRITS |
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Applied Catalysis., B,
146:279-288
2014
Resume: Metallophyte plants derived from phytoextn. are used as starting materials to prep. novel polymetallic catalysts. Polymetallic catalyst activity is used in many Lewis acid catalyzed reactions according to the polymetallic catalyst prepn. The synergetic catalysis of these systems leads to efficient syntheses of complex biomols. such as dihydropyrimidinone, 5'-capped DNA and RNA, and glycosyl aminoacid. These new polymetallic catalysts also bring new possibilities in Green Catalysis, that we named "Ecol. Catalysis". [on SciFinder(R)] Equipe: Département CP2S : Chimie et électrochimie des matériaux |
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Surface and Interface Analysis,
46:357-359
2014
DOI: 10.1002/sia.5649
Equipe: Département CP2S : Expériences et Simulations des Plasmas Réactifs - Interaction plasma-surface et Traitement des Surfaces ESPRITS |
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Plasma Processes and Polymers,
11:551-558
2014
Equipe: Département CP2S : Expériences et Simulations des Plasmas Réactifs - Interaction plasma-surface et Traitement des Surfaces ESPRITS |
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JOURNAL OF PHYSICS-CONDENSED MATTER,
26(1)
2014
ISSN: 0953-8984
Equipe: Département CP2S : Métallurgie et Surfaces |
2013 | |
Articles: | |
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Thin Solid Films,
545:310-319
2013
Resume: A microwave-generated plasma afterglow (MWGPA) treatment was applied to keratin fibers to improve their adhesion to anatase nanocrystals by modifying their surface chemical and physical structure. The induced photocatalytic self-cleaning property has significantly been improved by 70% as evidenced by complete stain decomposition in 6 h only. The effects of gas mixtures, gas flow, treatment distance, treatment duration and power flow of the MWGPA treatment on keratin's surface were investigated. The MWGPA-induced alteration of keratin's surface structure resulted in an increase in the uptake of anatase crystals and thus enhanced photocatalytic self-cleaning activities. The contact angle, absorption time, deposition behavior, adhesion and stability of anatase coating of keratin fibers are discussed. The anatase uptake and coating uniformity were characterized quantitatively using Time-of-Flight Secondary Ion Mass Spectrometry. This efficient and low energy plasma surface activation approach demonstrated potential toward the practical application of anatase in keratinous materials. Equipe: Département CP2S : Expériences et Simulations des Plasmas Réactifs - Interaction plasma-surface et Traitement des Surfaces ESPRITS |
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Contributions to Plasma Physics,
53:459-468
2013
Resume: This work presents the physics design for a simple quasi-axially symmetric stellarator. A plasma configuration described by a modest number of Fourier coefficients was found to establish this symmetry with good accuracy. The low rotational transform results in a relatively simple coil set exhibiting low curvatures and comfortable clearance between adjacent coils. As another consequence, the maximum achievable plasma pressure will be limited to about 0.5%. An experiment along the lines proposed would allow an exploration of the confinement properties of a quasi-axially symmetric configuration. ((c) 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) Equipe: Département CP2S : Expériences et Simulations des Plasmas Réactifs - Interaction plasma-surface et Traitement des Surfaces ESPRITS |