Recherche

Afficher tous les résultats pour

Accueil

Personne

Arnaud Magrez

À propos
Confidentialité
Mentions légales

Graph Chatbot

Publications associées (188)

Hydrogen storage properties of as-synthesized and severely deformed magnesium - multiwall carbon nanotubes composite

Arnaud Magrez

We prepared a Mg-2 mass % multiwall carbon nanotubes composite employing a powder metallurgy technique. The kinetics of hydrogen absorption/desorption of the as-synthesized composite was much faster than that of reference samples of pure Mg. The pressure-c ...

2010

Lithium niobate nanowires synthesis, optical properties, and manipulation

László Forró, Rachel Grange, Arnaud Magrez, Demetri Psaltis, Jae-Woo Choi, Chia-Lung Hsieh, Rita Smajda, Ye Pu, Ye Pu

Free-standing lithium niobate nanowires (LiNbO3) are synthesized by the hydrothermal route. The polarization response of the second harmonic generation (SHG) signal is measured in a single nanowire and used to identify the crystal orientation by matching w ...

2009

Lithium niobate nanowires: Growth, second-harmonic and dielectrophoretic properties

László Forró, Rachel Grange, Arnaud Magrez, Demetri Psaltis, Jae-Woo Choi, Chia-Lung Hsieh, Ye Pu, Ye Pu

2009

Mechanical and electronic properties of vanadium oxide nanotubes

László Forró, Andras Kis, Neven Barisic, Jin Won Seo, Arnaud Magrez, Balazs Sipos, Martial Duchamp

Vanadium oxide nanotubes with a diameter of 20-100 nm and an aspect ratio of 50-100 were synthesized by hydrothermal method. Young's modulus of 20-80 GPa was obtained by bending measurements of individual nanotubes using an atomic force microscope. Electri ...

American Institute of Physics2009

Preparation and characterization of SU8-carbon nanotube composites

László Forró, Moshe Judelewicz, Sébastien Jiguet, Arnaud Magrez, Marijana Mionic Ebersold

SU8-carbon nanotube composites have been produced to enhance the mechanical, electrical, and thermal properties of SU8 photoresists. Homogeneous composites materials have been obtained when multiwalled carbon nanotubes (MWCNTs) functionalized with COOH gro ...

2009

Synthesis and mechanical properties of carbon nanotubes produced by the water assisted CVD process

László Forró, Arnaud Magrez, Richard Meunier, Martial Duchamp, Klara Hernadi, Juan Carlos Andresen, Rita Smajda

Catalyst activity during the carbon nanotubes (CNTs) growth by chemical vapor deposition (CVD) is enhanced when water, a weak oxidizer, is introduced together with the carbon source. The height as well as the CNTs density can be controlled by fine-tuning t ...

2009

Increase in the Curie temperature and magnetic anisotropy in FePd/Pt-iron oxide core-shell nanoparticles

László Forró, Arnaud Magrez

Partially oxidized fcc FePd and FePt nanoparticles with mean diameters of 5 and 3 nm, respectively, were synthesized by a reverse micelle polyol process. In situ measurements of magnetic and structural properties during annealing showed a large increase in ...

2009

Towards electron spin resonance of mechanically exfoliated graphene

László Forró, Andrzej Sienkiewicz, Arnaud Magrez, Bálint Náfrádi, Marijana Mionic Ebersold, Luka Ciric

We have attempted to prepare graphene samples by mechanical exfoliation of HOPG (highly oriented pyrolytic graphite) using scotch tape. Random testing of the flakes by AFM has shown in majority single layer graphene. Nevertheless, the presence of ultrathin ...

2009

Cellular Toxicity of TiO2-Based Nanofilaments

László Forró, Arnaud Magrez, Lenke Horváth, Rita Smajda, Beat Schwaller

At present, nanofilaments are not exclusively based on carbon atoms but can be produced from many inorganic materials in the form of nanotubes and nanowires. It is essential to systematically assess the acute toxicity of these newly synthesized materials s ...

2009

La@C82 as a spin-active filling of SWCNTs: ESR study of magnetic and photophysical properties

László Forró, Andrzej Sienkiewicz, Arnaud Magrez, Bálint Náfrádi, Katarzyna Pierzchala, Luka Ciric, Duncan Thomas Lindsay Alexander

Electron microscopy (TEM) and electron spin resonance ESR) were applied to characterize lanthanum metallofullerene(La@C82)-filled peapods. The peapods were prepared by encapsulation of La@C82 in SWCNTs, which were obtained by laser ablation technique in th ...

2008

Pressure-Induced Phase Transitions in Micro-, Submicro-, and Nanocrystalline NaNbO3

Arnaud Magrez

Pressure-induced successive phase transitions of micro-, submicro-, and nanocrystalline NaNbO3 particles were investigated by high-pressure Raman spectroscopy. Microcrystalline NaNbO3, which stabilizes in an orthorhombic Pbcm structure at ambient pressure, ...

2008

Influence of the catalyst drying process and catalyst support particle size on the carbon nanotubes produced by CCVD

László Forró, Arnaud Magrez, Marijana Mionic Ebersold

Catalytic Chemical Vapour Deposition (CCVD) is considered as the most suitable technique for the large scale and low-cost production of multiwalled carbon nanotubes. We have studied the effect of the preparation process, and of the support particle size on ...

2008

Evidence of an equimolar C2H2-CO2 reaction in the synthesis of carbon nanotubes

László Forró, Jin Won Seo, Arnaud Magrez

Wiley-VCH Verlag GmbH2007

Uniformly Dispersed Deposition of Colloidal Nanoparticles and Nanowires by Boiling

László Forró, Andrzej Kulik, Gerit Kulik, Jürgen Brugger, Jin Won Seo, Sylvia Jeney, Arnaud Magrez, Kyumin Lee, Martial Duchamp, Ravi Shankar Sundaram

Uniformly dispersed deposition of various nanoparticles (gold and silver of 20?50 nm) and nanowires (ZnO and VOx) on different surfaces (Si, GaAs, mica, and steel) was obtained by boiling colloid drops on preheated substrates. Our results suggest a deposit ...

AIP American Institute of Physics2007

Multiwalled carbon nanotubes produced by a continuous CVD method and their use in melt mixed composites with polycarbonate

László Forró, Arnaud Magrez

In this study, two samples of multiwalled carbon nanotubes (MWNT) were synthesized by CVD of acetylene over Fe2Co catalysts supported by CaCO3 using different temperatures. The material produced at 660 °C (MWNT600) shows slightly better performance as evid ...

2007

Diameter-Dependent Elastic Modulus Supports the Metastable-Catalyst Growth of Carbon Nanotubes

László Forró, Andrzej Kulik, Jin Won Seo, Branimir Lukic, Arnaud Magrez, Kyumin Lee

We measured the elastic modulus of individual multiwalled carbon nanotubes (MWCNTs) grown by catalytic chemical vapor deposition (CVD) over a broad diameter range (10-25 nm). Alternating current (ac) dielectrophoresis was used for efficient tube deposition ...

American Chemical Society (ACS)2007

Temperature-induced Phase Transitions in Micro-, Submicro-, and Nanocrystalline NaNbO3

Arnaud Magrez

Phase transitions in micro-, submicro-, and nanocrystalline NaNbO3 were investigated by temperature-tuning Raman spectroscopy and X-ray powder diffraction method. Three powders with different average particle size showed successive phase transitions within ...

2007

Catalytically grown carbon nanotubes: from synthesis to toxicity

László Forró, Mirko Milas, Jin Won Seo, Arnaud Magrez, Kyumin Lee

Catalytic chemical vapour deposition (CCVD) is currently the most promising technique to produce carbon nanotubes (CNTs) on a specific site as well as on a large-scale. Here, we review our recent experimental studies on CNTs grown by CCVD. The yield as wel ...

2007

Noncentrosymmetric phase of submicron NaNbO3 crystallites

Arnaud Magrez

The temperature and pressure characteristics of a noncentrosymmetric crystal modification of NaNbO3 were studied by Raman spectroscopy. A transition towards the bulk-like structure of NaNbO3 occurs in the temperature range from 280 to 360 °C. High-pressure ...

2007

Electronic fluctuations in multi-walled carbon nanotubes

Arnaud Magrez

We report on the low-frequency electronic noise properties of individual multi-walled carbon nanotubes (CNTs). We present experimental evidence of the key role played by the structural quality of the tube and its gaseous environment on the excess noise lev ...

2006

Page 9 sur 10