scholarly journals Investigation of water adsorption on metal oxide surfaces under conditions representative of PuO2 storage containers.

2012 ◽  
Vol 1383 ◽  
Author(s):  
Patrick Murphy ◽  
Colin Boxall ◽  
Robin Taylor
Keyword(s):  
Metal Oxide ◽  
Resonant Frequency ◽  
Water Adsorption ◽  
Capillary Condensation ◽  
Crystal Surface ◽  
Porous Metal ◽  
Quartz Crystals ◽  
Metal Oxide Surfaces ◽  
Spurious Effect

ABSTRACTWe have developed a QCM (Quartz Crystal Microbalance) based method for direct gravimetric determination of water adsorption on PuO2 surrogate surfaces, especially CeO2, under conditions representative of those in a typical PuO2 storage can. In this application, the method of transduction of the QCM relies upon the linear relationship between the resonant frequency of piezoelectrically active quartz crystals and the mass adsorbed on the crystal surface. The spurious effect of high temperatures on the resonant frequency of coated QCM crystals has been compensated for by modeling the temperature dependence of the frequency response of the surrogate coated-QCM crystal in the absence of water. Preliminary results indicate that water is readily adsorbed from the vapor phase into porous metal oxide structures by capillary condensation, an observation that may have important ramifications for water uptake within the packed powder beds that may obtain in PuO2 storage cans.

scholarly journals Investigation of Water Adsorption on Metal Oxide Surfaces under Conditions Representative of PuO2 Storage Containers

2013 ◽  
Vol 53 (21) ◽  
pp. 81-94 ◽  
Author(s):  
P. M. Murphy ◽  
C. Boxall ◽  
R. J. Taylor ◽  
D. A. Woodhead
Keyword(s):  
Metal Oxide ◽  
Water Adsorption ◽  
Oxide Surfaces ◽  
Metal Oxide Surfaces ◽  
Storage Containers

Spin-coated epoxy resin embedding technique enables facile SEM/FIB thickness determination of porous metal oxide ultra-thin films

2018 ◽  
Vol 270 (3) ◽  
pp. 302-308 ◽  
Author(s):  
B. PEÑA ◽  
G.RH. OWEN ◽  
K.E. DETTELBACH ◽  
C.P. BERLINGUETTE
Keyword(s):  
Thin Films ◽  
Metal Oxide ◽  
Epoxy Resin ◽  
Porous Metal ◽  
Thickness Determination ◽  
Embedding Technique

Structural motifs of water on metal oxide surfaces

2017 ◽  
Vol 46 (7) ◽  
pp. 1785-1806 ◽  
Author(s):  
Rentao Mu ◽  
Zhi-jian Zhao ◽  
Zdenek Dohnálek ◽  
Jinlong Gong
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Water Adsorption ◽  
Molecular Level ◽  
State Of The Art ◽  
The State ◽  
Oxide Surfaces ◽  
Structural Motifs ◽  
Metal Oxide Surfaces ◽  
Model Surfaces

This review describes the state-of-the-art of the molecular-level understanding of water adsorption, dissociation and clustering on model surfaces of metal oxides.

Ultrathin Platinum Crystal Surface Structures

1985 ◽  
Vol 43 ◽  
pp. 394-395
Author(s):  
R. L. Hines
Keyword(s):  
Crystal Surface ◽  
Surface Structures ◽  
Platinum Surface ◽  
Platinum Surfaces ◽  
Resolution Level ◽  
Experimental Facilities ◽  
Carbon Backing ◽  
Mesh Grid ◽  
Atom Layer

The importance of atom layer terraces or steps on platinum surfaces used for catalysis as discussed by Somorjai justifies an extensive investigation of the structure of platinum surfaces through electron microscopy at the atomic resolution level. Experimental and theoretical difficulties complicate the quantitative determination of platinum surface structures but qualitative observation of surface structures on platinum crystals is now possible with good experimental facilities.Ultrathin platinum crystals with nominal 111 orientation are prepared using the procedure reported by Hines without the application of a carbon backing layer. Platinum films with thicknesses of about ten atom layers are strong enough so that they can be mounted on grids to provide ultrathin platinum crystals for examination of surface structure. Crystals as thin as possible are desired to minimize the theoretical difficulties in analyzing image contrast to determine structure. With the current preparation procedures the crystals frequently cover complete openings on a 400 mesh grid.

External Magnetic Field Effect on the Reaction of H2with O2on Metal Oxide Surfaces*

1992 ◽  
Vol 1 (Part_2) ◽  
pp. 309-319
Author(s):  
Hisao Ohnishi ◽  
Hirokazu Sasaki ◽  
Msamichi Ippommatsu
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Metal Oxide ◽  
Field Effect ◽  
Magnetic Field Effect ◽  
Oxide Surfaces ◽  
Metal Oxide Surfaces

Anisotropy of Nanoindentation – a tool for the determination of nanocrystal orientation ?

2003 ◽  
Vol 779 ◽  
Author(s):  
David Christopher ◽  
Steven Kenny ◽  
Roger Smith ◽  
Asta Richter ◽  
Bodo Wolf ◽  
...  
Keyword(s):  
Crystal Surface ◽  
Scanning Force Microscopy ◽  
Depth Range ◽  
Dislocation Loops ◽  
Force Microscopy ◽  
Pile Up ◽  
Out Of Plane ◽  
Scanning Force ◽  
Dynamics Simulations

AbstractThe pile up patterns arising in nanoindentation are shown to be indicative of the sample crystal symmetry. To explain and interpret these patterns, complementary molecular dynamics simulations and experiments have been performed to determine the atomistic mechanisms of the nanoindentation process in single crystal Fe{110}. The simulations show that dislocation loops start from the tip and end on the crystal surface propagating outwards along the four in-plane <111> directions. These loops carry material away from the indenter and form bumps on the surface along these directions separated from the piled-up material around the indenter hole. Atoms also move in the two out-of-plane <111> directions causing propagation of subsurface defects and pile-up around the hole. This finding is confirmed by scanning force microscopy mapping of the imprint, the piling-up pattern proving a suitable indicator of the surface crystallography. Experimental force-depth curves over the depth range of a few nanometers do not appear smooth and show distinct pop-ins. On the sub-nanometer scale these pop-ins are also visible in the simulation curves and occur as a result of the initiation of the dislocation loops from the tip.

scholarly journals Conversion of Methanol on Rutile TiO2 (110) and Tungsten Oxide Clusters: 2. The Role of Defects and Electron Transfer in Bifunctional Oxidic Photocatalysts

2021 ◽  
Author(s):  
Lars Mohrhusen ◽  
Jessica Kräuter ◽  
Katharina Al-Shamery
Keyword(s):  
Electron Transfer ◽  
Transition Metal ◽  
Metal Oxide ◽  
Tungsten Oxide ◽  
Organic Compounds ◽  
Uv Irradiation ◽  
Organic P ◽  
Rutile Tio2 ◽  
Metal Oxide Surfaces

The photochemical conversion of organic compounds on tailored transition metal oxide surfaces by (UV) irradiation has found wide applications ranging from the production of chemicals to the degradation of organic...

A new computational strategy to calculate the surface energy of a dipolar crystal surface

CrystEngComm ◽  
2021 ◽  
Author(s):  
Marco Bruno ◽  
Stefano Ghignone
Keyword(s):  
Dipole Moment ◽  
Surface Energy ◽  
Energy Surface ◽  
Crystal Surface ◽  
Computational Strategy

Determination of the energy surface, γ_((hkl)) (J/m2), of crystal polar faces is a very difficult task, for the presence of a dipole moment perpendicular to these surfaces that prevents the...

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