Analysis of electrical charging and discharging kinetics of different glasses under electron irradiation in a scanning electron microscope

2010 ◽  
Vol 108 (9) ◽  
pp. 093705 ◽  
Author(s):  
S. Fakhfakh ◽  
O. Jbara ◽  
S. Rondot ◽  
A. Hadjadj ◽  
J. M. Patat ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Electron Irradiation ◽  
Kinetics Of ◽  
Electrical Charging ◽  
Scanning Electron

Electrical charging of percolating samples in the scanning electron microscope

1989 ◽  
Vol 55 (26) ◽  
pp. 2787-2789 ◽  
Author(s):  
Z. Barkay ◽  
B. Dwir ◽  
G. Deutscher ◽  
E. Grünbaum
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Electrical Charging ◽  
Scanning Electron

scholarly journals Degradation of Tannic Acid Using TiO2 Nanotubes as Electrocatalyst

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
N. Lakshmi Kruthika ◽  
G. Bhaskar Raju ◽  
S. Prabhakar
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Uv Radiation ◽  
Tannic Acid ◽  
Tio2 Nanotubes ◽  
Zero Order ◽  
Titanium Sheet ◽  
Kinetics Of ◽  
Scanning Electron ◽  
Tannic Acid Solution

Structured TiO2 nanotubes were grown on 2 mm thick titanium sheet by anodization of titanium in ethylene glycol medium containing 0.025 M NaF. The morphology of TiO2 nanotubes (TNT) was characterized using field emission scanning electron microscope. The potential of TNT as anode and also as photocatalyst for the degradation of tannic acid was studied. The mineralization of tannic acid was measured in terms Total Organic Carbon (TOC). Only 50% of TOC could be removed by exposing the tannic acid solution to UV-radiation (photolysis), whereas it was improved to 70% by electrooxidation (EO) using TNT as anode. Maximum degradation of 83% was achieved when electrooxidation was conducted under the influence of UV-radiation (photoelectrocatalytic process (PEC)). Among the electrolytes tried, Na2SO4 was observed to be very effective for the degradation of tannic acid. The kinetics of tannic acid degradation by photoelectrocatalytic process was found to follow zero-order rate expression.

Kinetics of Reduction and Precipitation of U(VI) in the Dissolution of UO2(s) Under Anoxic Conditions in NaCl 5 mol kg−1. Influence of Metallic Iron

1997 ◽  
Vol 506 ◽  
Author(s):  
J. Giménez ◽  
M. Molera ◽  
I. Casas ◽  
M.E. Torrero ◽  
J. de Pablo
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Order Kinetic ◽  
Spent Fuel ◽  
Experimental Conditions ◽  
First Order ◽  
Lower Solubility ◽  
Kinetics Of ◽  
Kinetics Of Reduction ◽  
Scanning Electron

ABSTRACTExperiments of spent fuel dissolution performed in presence of iron show, for uranium as well as for some radionuclides, lower final concentrations than measured in similar experiments but in absence of iron. So far, only the final concentrations obtained in these experiments have been published. In this work, we have focused our study on the reduction of uranium (VI) due to the presence of iron and the subsequent precipitation of Uranium (IV) due to its lower solubility. This behavior has been confirmed using a Scanning Electron Microscope by observing an uranium phase precipitated on the iron surface and assuming, under the experimental conditions, that it most likely corresponds to U02(s). We have modeled this process assuming a first-order kinetic.

scholarly journals Direct electron irradiation of DNA in a fully aqueous environment. Damage determination in combination with Monte Carlo simulations

2017 ◽  
Vol 19 (3) ◽  
pp. 1798-1805 ◽  
Author(s):  
Marc Benjamin Hahn ◽  
Susann Meyer ◽  
Maria-Astrid Schröter ◽  
Harald Seitz ◽  
Hans-Jörg Kunte ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Monte Carlo Simulations ◽  
Electron Irradiation ◽  
Plasmid Dna ◽  
Aqueous Environment ◽  
Scanning Electron

We report on a study in which plasmid DNA in water was irradiated with 30 keV electrons generated by a scanning electron microscope and passed through a 100 nm thick Si3N4 membrane.

Experimental study of polymethyl methacrylate: damage under corona discharge

2018 ◽  
Vol 82 (3) ◽  
pp. 31301
Author(s):  
Nora Kireche ◽  
Sébastien Rondot ◽  
Ferroudja Bitam-Megherbi ◽  
Omar Jbara ◽  
Mickael Gilliot ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Corona Discharge ◽  
Polymethyl Methacrylate ◽  
Electron Irradiation ◽  
Degradation Mechanism ◽  
Dielectric Behavior ◽  
Chemical Degradation ◽  
Surface Damages ◽  
Scanning Electron

In high-voltage applications, insulators may be exposed to corona discharges during long periods. In this experimental work, corona discharge tests of different durations are carried out in air at atmospheric pressure on polymethyl methacrylate (PMMA) samples. The resulting surface degradation is studied with several techniques. The surface damages are observed with environmental scanning electron microscope and atomic force microscopy. The results show that electrical trees occur on the surface of material and their distribution depends on the corona discharge duration. The chemical changes on PMMA surface are analyzed by Fourier transform infrared spectroscopy and a chemical degradation mechanism is proposed. Evolution of surface resistivity with corona aging is also implemented by using a classical I(V) method. In addition, to study the dielectric behavior of PMMA, the monitoring of kinetics of the trapped charge under electron irradiation in a scanning electron microscope is performed. The charging ability of PMMA under electron irradiation and its time constant of charging decrease with electrical aging.

The Alteration of the Pore Spaces in Sandstones

1973 ◽  
Vol 31 ◽  
pp. 210-211
Author(s):  
R. E. Ferrell ◽  
G. G. Paulson
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
The Other ◽  
Coarse Grained ◽  
Depositional Fabric ◽  
Soluble Components ◽  
Scanning Electron ◽  
Shape And Size

The pore spaces in sandstones are the result of the original depositional fabric and the degree of post-depositional alteration that the rock has experienced. The largest pore volumes are present in coarse-grained, well-sorted materials with high sphericity. The chief mechanisms which alter the shape and size of the pores are precipitation of cementing agents and the dissolution of soluble components. Each process may operate alone or in combination with the other, or there may be several generations of cementation and solution.The scanning electron microscope has ‘been used in this study to reveal the morphology of the pore spaces in a variety of moderate porosity, orthoquartzites.

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