Hydrogen Desorption from MgH2 Based Nano-Micro Composites

2006 ◽  
Vol 971 ◽  
Author(s):  
Ennio Bonetti ◽  
Anna Lisa Fiorini ◽  
Luca Pasquini ◽  
Nadica Abazovic ◽  
Amelia Montone ◽  
...  
Keyword(s):  
Hydrogen Desorption ◽  
Sorption Kinetics ◽  
Inert Gas ◽  
Mechanical Processing ◽  
Mechanical Spectroscopy ◽  
Scanning Calorimetry ◽  
Sorption Behaviour ◽  
Similar Composition ◽  
Gas Condensation ◽  
Inert Gas Condensation

ABSTRACTThe microstructure and hydrogen sorption behaviour of MgH2 based nano-hydrides with different additives prepared by ball milling and inert gas condensation has been investigated by XRD, Differential Scanning Calorimetry and Mechanical Spectroscopy. Preliminary results on materials with similar composition and different nanostructures show that suitable mechanical processing and additive additions induce in the nanostructured composites tailored channels for improved ab/de-sorption kinetics at reduced temperatures.

MgH2 by Gas Phase Condensation: Nanostructure Morphology and Hydrogen Sorption Behaviour

2007 ◽  
Vol 1042 ◽  
Author(s):  
Ennio Bonetti ◽  
Elsa Callini ◽  
Amelia Montone ◽  
Luca Pasquini ◽  
Emanuela Piscopiello ◽  
...  
Keyword(s):  
Gas Phase ◽  
Inert Gas ◽  
Desorption Kinetics ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Sorption Behaviour ◽  
X Ray ◽  
Gas Condensation ◽  
Inert Gas Condensation ◽  
Pressure Differential Scanning Calorimetry

AbstractInert gas condensation was employed to prepare nanoparticles of Mg and MgH2 which morphology, clustering degree and structural stability have been investigated by X-ray diffraction and electron microscopy. Thermodynamic functional properties of the Mg and MgH2 nanostructured samples were investigated by high pressure differential scanning calorimetry. Some specific features of the morphology of the samples prepared by inert gas condensation are compared with powders obtained by ball milling through desorption kinetics behavior.

Highly Size-Controlled Synthesis of Metal Nanoclusters by Inert-Gas Condensation for Nano-Devices

2010 ◽  
Vol 10 (5) ◽  
pp. 3667-3670 ◽  
Author(s):  
Il-Suk Kang ◽  
Hyun-Sang Seo ◽  
Deuk-Han Kim ◽  
Taek-Yeong Lee ◽  
Jun-Mo Yang ◽  
...  
Keyword(s):  
Inert Gas ◽  
Controlled Synthesis ◽  
Metal Nanoclusters ◽  
Gas Condensation ◽  
Inert Gas Condensation ◽  
Size Controlled

Inert gas condensation of Sb, Bi and Pb clusters

1981 ◽  
Vol 106 (1-3) ◽  
pp. A170
Author(s):  
J. Mühlbach ◽  
E. Recknagel ◽  
K. Sattler
Keyword(s):  
Inert Gas ◽  
Gas Condensation ◽  
Inert Gas Condensation

Formation Mechanism of Fe Nanocubes by Magnetron Sputtering Inert Gas Condensation

ACS Nano ◽  
2016 ◽  
Vol 10 (4) ◽  
pp. 4684-4694 ◽  
Author(s):  
Junlei Zhao ◽  
Ekaterina Baibuz ◽  
Jerome Vernieres ◽  
Panagiotis Grammatikopoulos ◽  
Ville Jansson ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Formation Mechanism ◽  
Inert Gas ◽  
Gas Condensation ◽  
Inert Gas Condensation

EFFECTIVE MAGNETIC ANISOTROPY AND COERCIVITY IN Fe NANOPARTICLES PREPARED BY INERT GAS CONDENSATION

2006 ◽  
Vol 20 (01) ◽  
pp. 37-47
Author(s):  
LUBNA RAFIQ SHAH ◽  
BAKHTYAR ALI ◽  
S. K. HASANAIN ◽  
A. MUMTAZ ◽  
C. BAKER ◽  
...  
Keyword(s):  
Room Temperature ◽  
Size Range ◽  
Magnetic Measurements ◽  
Uniaxial Anisotropy ◽  
Inert Gas ◽  
Condensation Process ◽  
Gas Condensation ◽  
Inert Gas Condensation ◽  
Fe Nanoparticles ◽  
Characterization Studies

We present magnetic measurements on iron ( Fe ) nanoparticles in the size range 10–30 nm produced by the Inert Gas Condensation process (IGC). Structural characterization studies show the presence of a core/shell structure, where the core is bcc Fe while the surface layer is Fe -oxide. Analysis of the magnetic measurements shows that the nanoparticles display very large uniaxial anisotropy, K eff ≈3 - 4 × 106 erg/cc. The observed room temperature coercivities lie in the range ≈600 – 973 Oe , much larger than those expected from the Stoner–Wohlfarth model using the bulk iron anisotropy. It can be inferred from the coercivity variation with the particle size that there is a general trend of the coercivity increasing with size, culminating finally in a decrease for high sizes (30 nm) possibly due to the onset of non-coherent magnetization reversal processes.

scholarly journals Forming pressure effect on microstructure and mechanical properties of nanocrystalline aluminum synthesized by inert gas condensation

2019 ◽  
Vol 79 ◽  
pp. 02002
Author(s):  
Shangshu Wu ◽  
Zhou Yu ◽  
Junjie Wang ◽  
Hanxin Zhang ◽  
Chaoqun Pei ◽  
...  
Keyword(s):  
Room Temperature ◽  
High Vacuum ◽  
Inert Gas ◽  
Helium Atmosphere ◽  
Gas Condensation ◽  
Inert Gas Condensation ◽  
In Situ Forming ◽  
Nanocrystalline Aluminum ◽  
Al Powder

The preparation of nanocrystalline aluminum (NC Al) was conducted in two steps. After the NC Al powder was synthesized by an Inert gas condensation (IGC) method in a helium atmosphere of 500 Pa, the NC Al powder was in-situ compacted into a pellet with a 10 mm diameter and 250 μm-300 μm thickness in a high vacuum (10-6 Pa-10-7 Pa) at room temperature. The NC Al samples were not exposed to air during the entire process. After the pressure reached 6 GPa, the relative density could reach 99.83%. The results showed that the grain size decreased with the increased of in-situ forming pressure. The NC Al samples present obvious ductile fracture, and the tensile properties were greatly changed with the increase of forming pressure.

On the formation of ternary metallic-dielectric multicore-shell nanoparticles by inert-gas condensation method

2015 ◽  
Vol 151 ◽  
pp. 275-281 ◽  
Author(s):  
Maria Benelmekki ◽  
Jerome Vernieres ◽  
Jeong-Hwan Kim ◽  
Rosa-E. Diaz ◽  
Panagiotis Grammatikopoulos ◽  
...  
Keyword(s):  
Inert Gas ◽  
Shell Nanoparticles ◽  
Gas Condensation ◽  
Inert Gas Condensation ◽  
Condensation Method
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