Probing the Room Temperature Spatial Distribution of Hydrogen in Nanoporous Carbon by Use of Small-Angle Neutron Scattering

2010 ◽  
Vol 114 (47) ◽  
pp. 19895-19900 ◽  
Author(s):  
Cheng-Si Tsao ◽  
Mingda Li ◽  
Yang Zhang ◽  
Juscelino B. Leao ◽  
Wei-Shan Chiang ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Room Temperature ◽  
Nanoporous Carbon

Sans Measurement of Deuterium-Dislocation Correlation in Palladium

1989 ◽  
Vol 166 ◽  
Author(s):  
Brent J. Heuser ◽  
G.C. Summerfield ◽  
J.S. King ◽  
J.E. Epperson
Keyword(s):  
Neutron Scattering ◽  
Cross Section ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Room Temperature ◽  
Gas Pressure ◽  
Solution Phase ◽  
Pressure Cell ◽  
Scattering Cross ◽  
The Difference

ABSTRACTSmall angle neutron scattering (SANS) measurements have been made on deformed polycrystal palladium samples with and without deuterium dissolved in the solution phase (a) at room temperature. Concentrations were held constant during SANS experiments by an equilibrium gas pressure cell. The difference scattering cross section for the same sample with and without deuterium loading has a 1/Q behavior (Q=4Φ/λsinθ/2) at intermediate values of Q. At very low values of Q the dependence is much stronger than 1/Q. The 1/Q behavior is attributed to deuterium trapping close to long dislocation cores forming rod-like scattering structures.

scholarly journals Structure of nanocrystalline palladium and copper studied by small angle neutron scattering

1996 ◽  
Vol 11 (12) ◽  
pp. 3110-3120 ◽  
Author(s):  
P. G. Sanders ◽  
J. R. Weertman ◽  
J. G. Barker
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Room Temperature ◽  
Prompt Gamma Activation Analysis ◽  
Prompt Gamma ◽  
Number Density ◽  
Warm Compaction ◽  
Gas Condensation ◽  
Micrometer Size

The structure of nanocrystalline palladium and copper, made by inert gas condensation and compaction, was studied using small angle neutron scattering (SANS), optical microscopy, and scanning electron microscopy. The effects of annealing and warm compaction were also examined with these techniques. The SANS results were interpreted using a maximum entropy routine, combined with knowledge of the Archimedes density and hydrogen concentration determined by prompt gamma activation analysis (PGAA). Similar hydrogen concentrations were detected by SANS and PGAA. This hydrogen content, which was approximately 5 at. % in samples compacted at room temperature, was reduced by both annealing and warm compaction. Defects in several size classes were observed, including missing grain pores (≈1−50 nm diameter) and defects of micrometer size. Warm compaction produced a lower number density of pores in nanocrystalline palladium, which led to increased density. The observed structure was correlated with Vickers microhardness and fracture surface morphology.

scholarly journals Small Angle Neutron Scattering from Nanocrystalline Pd and Cu Compacted at Elevated Temperatures

1994 ◽  
Vol 351 ◽  
Author(s):  
P.G. Sanders ◽  
J.R. Weertman ◽  
J.G. Barker ◽  
R.W. Siegel
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Prompt Gamma Activation Analysis ◽  
Impurity Level ◽  
Prompt Gamma ◽  
Gas Condensation ◽  
Hardness Increase

ABSTRACTNanocrystalline (n-) Cu and Pd, prepared by inert gas condensation (IGC) and in situ room temperature (RT) and elevated temperature (warm) compactions, have been studied by small angle neutron scattering (SANS). Previous work [1] on room temperature compacted and subsequently annealed n-Pd seemed to show that all the scattering could be accounted for by a distribution of pores. Analysis of more extensive SANS measurements, together with the results of prompt gamma activation analysis (PGAA), indicates that the SANS can be explained by the presence of pores and hydrogen. Warm compaction reduces the hydrogen impurity level, while increasing the bulk density and decreasing the pore size. This can lead to a dramatic hardness increase in these materials.

Poly(ionic liquid)-derived nanoporous carbon analyzed by combination of gas physisorption and small-angle neutron scattering

Carbon ◽  
2015 ◽  
Vol 82 ◽  
pp. 425-435 ◽  
Author(s):  
Simone Mascotto ◽  
Danuta Kuzmicz ◽  
Dirk Wallacher ◽  
Miriam Siebenbürger ◽  
Daniel Clemens ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Nanoporous Carbon ◽  
Poly Ionic Liquid

Determination of the spatial distribution of multiple fluid phases in porous media by ultra-small-angle neutron scattering

2010 ◽  
Vol 256 (17) ◽  
pp. 5329-5333 ◽  
Author(s):  
M. Kainourgiakis ◽  
Th. Steriotis ◽  
G. Charalambopoulou ◽  
M. Strobl ◽  
A. Stubos
Keyword(s):  
Porous Media ◽  
Spatial Distribution ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Fluid Phases
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