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335documents trouvés

17121
27/06/2017

Optimal sizing of a lithium battery energy storage system for grid-connected photovoltaic systems

J.DULOUT, A.ANVARI-MOGHADDAM, A.LUNA, B.JAMMES, C.ALONSO, J.GUERRERO

ISGE, Aalborg

Manifestation avec acte : International Conference on DC Microgrids ( ICDCM ) 2017 du 27 avril au 29 avril 2017, Nuremberg (Allemagne), Juin 2017, 6p. , N° 17121

Lien : https://hal.archives-ouvertes.fr/hal-01516972

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Abstract

This paper proposes a system analysis focused on finding the optimal operating conditions (nominal capacity, cycle depth, current rate, state of charge level) of a lithium battery energy storage system. The purpose of this work is to minimize the cost of the storage system in a renewable DC microgrid. Thus, main stress factors influencing both battery lifetime (calendar and cycling) and performances are described and modelled. Power and energy requirements are also discussed through a probabilistic analysis on some years of real data from the ADREAM photovoltaic building of the LAAS-CNRS in Toulouse, FRANCE.

139775
17098
09/06/2017

Basic mechanisms of Al interaction with the ZnO surface

Y.GAO, L.MARIN MERCADO, E.C.MATTSON, J.CURE, C.E.NANAYAKKARA, J.F.VEYAN, A.LUCERO, J.KIM, C.ROSSI, A.ESTEVE, Y.J.CHABAL

University of Texas, NEO

Revue Scientifique : Journal of Physical Chemistry C, Vol.121, N°23, pp.12780-12788, Juin 2017, DOI: 10.1021/acs.jpcc.7b02661 , N° 17098

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Abstract

Deposition of Al on ZnO is used for a number of electronic and catalytic devices as well as for nanoenergetic materials. The interface structure and chemical composition often control the performance of devices. In this study, in situ infrared spectroscopy, X-ray photoemission spectroscopy, and low energy ion scattering are combined to investigate the initial stage of interface formation between Al and ZnO. We find that (a) the interface is highly inhomogeneous with discontinuous Al patches, leaving ∼10% of the ZnO surface uncovered even after deposition of an equivalent of 11 nm-thick Al film; (b) upon Al deposition, Al reduces ZnO by forming Al2O3 and releasing Zn to the surface, and this process continues as more Al is deposited; (c) the reduced surface Zn atoms readily desorb at 150 °C; and (d) at higher temperature (>600 °C) all Al is oxidized as a result of mass transport. Deposition of a thin Al2O3 layer on ZnO prior to Al deposition effectively prevents Al penetration and Zn release, requiring higher temperatures to oxidize Al.

139893
17137
01/06/2017

Role of Trimethylaluminum (TMA) in low temperature atomic layer deposition of silicon nitride

A.DANGERFIELD, C.E.NANAYAKKARA, A.MALLIKARJUNAN, X.LEI, R.M.PEARLSTEIN, A.DERECSKEI-KOVACS, J.CURE, A.ESTEVE, Y.J.CHABAL

University of Texas, Versum Materials Inc, NEO

Rapport LAAS N°17137, DOI: 10.1021/acs.chemmater.7b01816, Juin 2017, 11p.

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Abstract

Aminosilanes are attractive precursors for atomic layer deposition of silicon oxides and nitrides because they are halide-free and more reactive than chlorosilanes. However, the deposition of silicon nitride on oxide substrates still requires relatively high temperatures. We show here that for a process involving disec-butylaminosilane and hydrazine, the insertion of Al from trimethyl aluminum allows the deposition of silicon nitride films at relatively low temperatures (250 °C). First-principles calculations reveal that the presence of Al increases the binding of molecular hydrazine, thereby effectively enhancing the reactivity of hydrazine with the silicon precursor during the atomic layer deposition process, which leads to nitrogen incorporation into silicon. However, the range of this enhancement is limited to ∼1 nm, requiring additional trimethylaluminum exposures to continue the Si3N4 deposition.

140093
16410
01/06/2017

A multi-phase micro-kinetic model for simulating aluminium based thermite reaction

V.BAIJOT, M.DJAFARI ROUHANI, C.ROSSI, A.ESTEVE

NEO

Revue Scientifique : Combustion and Flame, Vol.180, pp.10-19, Juin 2017 , N° 16410

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Abstract

This paper presents a hierarchical multiscale approach based on a micro-kinetic model enabling to predict temperature, pressure and species generated during the thermite reaction of Al nanoparticles mixed with CuO nanoparticles. Overall, our phenomenological model integrates and combines series of complex atomistic mechanisms, e.g. diffusion and phase transformation, gas phase reactions and interphase exchange mechanisms, in particular molecular condensation, evaporation and decomposition. Thermodynamics considerations as well as Density Functional Theory (DFT) calculations are used to implement rate equations expressing the complex reactions at solid/liquid/gas interphases. We demonstrate that the model can predict the pressure–time dependence, the different phases and compositions with good accuracy at significantly low computational cost. The influence of Al and CuO particle size, compaction or density, alumina shell thickness and stoichiometry on the pressure and temperature versus time is theoretically predicted with fairly good agreement with available experimental data. A maximum pressure of 47 MPa and adiabatic temperature of 3500 K are obtained at high compaction, i.e. 50% of the TMD (Theoretical Maximum Density) for stoichiometric mixture, where AlO is shown to be the prevailing gaseous species. At low compaction, we highlight the role of ambient oxygen condition for which the model gives a maximal pressure of 4.2 MPa for Al rich mixtures (stoichiometric ratio of 1.2).

139192
17088
22/05/2017

On-chip ignition of Al/CuO reactive multilayers: influence of the heating surface area and substrate nature

A.NICOLLET, L.MARIN MERCADO, A.BELISARIO, C.ROSSI

NEO

Manifestation avec acte : E-MRS Spring Meeting 2017 du 22 mai au 26 mai 2017, Strasbourg (France), Mai 2017, 1p. , N° 17088

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139524
17086
22/05/2017

Nano-engineering of reactive interfaces to monitor Al/CuO nanolaminate properties

L.MARIN MERCADO, A.ESTEVE, Y.GAO, Y.J.CHABAL, C.ROSSI

NEO, University of Texas

Manifestation avec acte : E-MRS Spring Meeting 2017 du 22 mai au 26 mai 2017, Strasbourg (France), Mai 2017, 1p. , N° 17086

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139520
17087
22/05/2017

A multi-phase micro-kinetic model for simulating the combustion of aluminothermites: case of Al/CuO powder mixtures

V.BAIJOT, M.DJAFARI ROUHANI, C.ROSSI, A.ESTEVE

NEO

Affiche/Poster : E-MRS Spring Meeting 2017 du 22 mai au 26 mai 2017, Strasbourg (France), Mai 2017, 1p. , N° 17087

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139522
17116
22/05/2017

DNA nanotechnologies for investigating Al/CuO nanoenergetic biocomposite: synthesis and thermal properties

T.CALAIS, V.BAIJOT, MC.BLATCHE, M.DJAFARI ROUHANI, Y.J.CHABAL, A.ESTEVE, C.ROSSI

NEO, I2C, University of Texas

Manifestation avec acte : E-MRS Spring Meeting 2017 du 22 mai au 26 mai 2017, Strasbourg (France), Mai 2017, 1p. , N° 17116

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139755
17117
05/05/2017

Nouveaux types d’électrodes pour les microsupercondensateurs

D.PECH, C.LETHIEN, T.BROUSSE

ISGE, IEMN Villeneuve, INM, Nantes

Revue Scientifique : Techniques de l'Ingénieur, Vol.RE 180, 30p., Mai 2017 , N° 17117

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Résumé

Les microsupercondensateurs sont des microdispositifs de stockage réversible de l’énergie électrique constituant une alternative intéressante aux microbatteries en raison de leur puissance élevée et de leur durée de vie importante. La faible quantité d’énergie qu’ils peuvent emmagasiner reste cependant un point critique au déploiement de ces composants dans les microsystèmes embarqués. Cet article traite des nouveaux types d’électrodes de microsupercondensateurs, des filières technologiques pour les intégrer au sein du microdispositif et des performances de ces électrodes. Il est notamment question de l’utilisation d’électrodes tridimensionnelles pour accroître leur densité d’énergie surfacique.

139757
17135
04/05/2017

Conception et réalisation d'un interrupteur bidirectionnel silicium pour des applications secteur : le transistor BipAC

H.RIZK

ISGE

Doctorat : Université de Toulouse III - Paul Sabatier, 4 Mai 2017, 186p., Président: F.RICHARDEAU, Rapporteurs: Z.KHATIR, S.LEFEBVRE, Examinateurs: M.BREIL-DUPUY, L.THEOLIER, Directeurs de thèse: F.MORANCHO, A.BOURENANNE , N° 17135

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140053
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