Microgravimetric Corrosion Studies on UO2

2003 ◽  
Vol 807 ◽  
Author(s):  
Detlef H. Wegen ◽  
T. Gouder ◽  
M. Eckle ◽  
T. Wiss ◽  
J.-P. Glatz
Keyword(s):  
Thin Film ◽  
Cyclic Voltammetry ◽  
Weight Change ◽  
Quartz Crystal ◽  
Spent Fuel ◽  
Corrosion Studies ◽  
Fuel Storage ◽  
First Time ◽  
Micro Balance

ABSTRACTFor the first time at ITU electrochemical quartz crystal micro-balance has been used for the investigation of UO2 thin film oxidation. The combination of cyclic voltammetry with nano-gram weight change measurements in-situ has shown at least two steps in the initial stages of UO2 dissolution under oxidising conditions relevant to spent fuel storage.

scholarly journals Photo-induced changes in the Langmuir adsorption constants of metal oxide layers in self-cleaning cation sensors.

2012 ◽  
Vol 1406 ◽  
Author(s):  
Philip S. Foran ◽  
Colin Boxall
Keyword(s):  
Metal Oxide ◽  
Quartz Crystal ◽  
Photoinduced Change ◽  
Langmuir Adsorption ◽  
Adsorption Sites ◽  
Adsorption Processes ◽  
Two Parameters ◽  
Induced Changes ◽  
First Time

ABSTRACTFor the first time, we have used a metal oxide-coated quartz crystal microbalance (QCM) to measure Cs+ adsorption onto illuminated and un-illuminated mesoporous TiO2 (m-TiO2) films by microgravimetric means in-situ. In the simplest case, such experiments yield two parameters of interest: K, the Langmuir adsorption coefficient and mmax the maximum mass of adsorbate to form a complete monolayer at the m-TiO2-coated quartz crystal piezoelectric surface. Importantly, we have found that illumination of the m-TiO2 film with ultra bandgap light results in an increase in mmax i.e. illumination allows for greater adsorption of substrate to occur than in the dark. Our studies also show that under illumination, K also increases indicating a higher affinity for surface adsorption. The photoinduced change in mmax and K are thought to be due to an increase in surface bound titanol groups, thus increasing the number of available adsorption sites – and so providing evidence to support the notion of photoinduced adsorption processes in photocatalytic systems. These findings have implications for the development of a reversible adsorption based microgravimetric sensor for Cs+.

In situ X-ray Investigation of Hydrogen Charging in Thin Film Bimetallic Electrodes

1997 ◽  
Vol 12 (8) ◽  
pp. 2091-2098 ◽  
Author(s):  
Najeh M. Jisrawi ◽  
Harold Wiesmann ◽  
M. W. Ruckman ◽  
T. R. Thurston ◽  
G. Reisfeld ◽  
...  
Keyword(s):  
Thin Film ◽  
Cyclic Voltammetry ◽  
Hydrogen Uptake ◽  
Metallic Films ◽  
X Ray Diffraction ◽  
Cell Potential ◽  
Multilayered Thin Film ◽  
X Ray ◽  
Multilayer Electrode

Hydrogen uptake and discharge by thin metallic films under potentiostatic control was studied using x-ray diffraction at the National Synchroton Light Source (NSLS). The formation of metal-hydrogen phases in Pd, Pd-capped Nb, and Pd/Nb multilayer electrode structures was deduced from x-ray diffraction data and correlated with the cyclic voltammetry (CV) peaks. The x-ray data were also used to construct a plot of the hydrogen concentration as a function of cell potential for a multilayered thin film.

Monitoring Organic Thin Film Growth In Aqueous Solution In-situ With A Combined Quartz Crystal Microbalance and Ellipsometry

2008 ◽  
Vol 1146 ◽  
Author(s):  
Amitabha Sarkar ◽  
Tapani Viitala ◽  
Tino Hofmann ◽  
Tom E. Tiwald ◽  
John A. Woollam ◽  
...  
Keyword(s):  
Thin Film ◽  
Aqueous Solution ◽  
Water Content ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Film Growth ◽  
High Water Content ◽  
Organic Thin Film ◽  
Polymer Thin Film

AbstractThe change of the visible light ellipsometric parameters and mechanical harmonic frequencies of a hydrophobic gold surface attached to a quartz crystal are measured in aqueous solution during deposition of synperonic polymer thin film. The ellipsometry data reveal the amount of polymer mass attached to the surface, while the mechanical resonance shifts are caused by the total mass attached to the surface. Analysis of the combined ellipsometry and quartz crystal microbalance data reveal that the polymer thin film has a high water content, and we determine in-situ, for the first time, the porosity, or the water content, of a polymer thin film in aqueous solution.

Corrosion Behaviors Studied in Self-Assembled Processes of Alkanethiol Monolayers on Polycrystalline Gold Substrates

2007 ◽  
Vol 121-123 ◽  
pp. 385-388
Author(s):  
Z. Cao ◽  
Zhong Liang Xiao ◽  
Ning Gu ◽  
S. Shimada ◽  
T. Fukuda ◽  
...  
Keyword(s):  
Corrosion Rate ◽  
Quartz Crystal ◽  
Force Microscopy ◽  
Atomic Force ◽  
Gold Substrates ◽  
Corrosion Behaviors ◽  
Polycrystalline Gold ◽  
First Time ◽  
Fast Stage

In this paper, the corrosion phenomenon occurred on the polycrystalline gold substrates has been for the first time observed by in situ quartz crystal microbalance (QCM) method for adsorption of alkanethiol monolayers, which may be attributed to thiol-induced dissolution of gold during the adsorption process in the presence of oxygen. It is evident from the image of many corrosive defects or holes produced on the surface of gold grains by using atomic force microscopy (AFM). The kinetic equation on corrosion rate of gold dissolved in the organothiol solution has been obtained. The gold corrosion rate at fast stage can be estimated to be 9.2 × 1011 Au atoms cm-2 s-1.

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