scholarly journals In situ XRF study of black colouring matter of the Palaeolithic figures in the Font-de-Gaume cave

2021 ◽  
Author(s):  
Antoine Trosseau ◽  
Anne Maigret ◽  
Yvan Coquinot ◽  
Ina Reiche
Keyword(s):  
Manganese Oxide ◽  
Rock Art ◽  
X Ray ◽  
Non Invasive ◽  
Complex Chemistry

After the discovery of Font-de-Gaume's prehistoric rock art in 1902, first non-invasive in situ X-ray fluorescence analyses reveal the complex chemistry of atleast three types of black manganese oxide-based colouring matter.

scholarly journals Redox Processes of Manganese Oxide in Catalyzing Oxygen Evolution and Reduction: An in Situ Soft X-ray Absorption Spectroscopy Study

2017 ◽  
Vol 121 (33) ◽  
pp. 17682-17692 ◽  
Author(s):  
Marcel Risch ◽  
Kelsey A. Stoerzinger ◽  
Binghong Han ◽  
Tom Z. Regier ◽  
Derek Peak ◽  
...  
Keyword(s):  
Manganese Oxide ◽  
Oxygen Evolution ◽  
Absorption Spectroscopy ◽  
Redox Processes ◽  
Spectroscopy Study ◽  
X Ray ◽  
X Ray Absorption

In situ Synthesis of Mixed-Valent Manganese Oxide Nanocrystals:  An In situ Synchrotron X-ray Diffraction Study

2006 ◽  
Vol 128 (14) ◽  
pp. 4570-4571 ◽  
Author(s):  
Xiong-Fei Shen ◽  
Yun-Shuang Ding ◽  
Jonathan C. Hanson ◽  
Mark Aindow ◽  
Steven L. Suib
Keyword(s):  
Manganese Oxide ◽  
Diffraction Study ◽  
In Situ Synthesis ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals Non-Invasive Approaches for the Evaluation of the Functionalization of Melamine Foams with In-Situ Synthesized Silver Nanoparticles

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 996 ◽  
Author(s):  
Suset Barroso-Solares ◽  
Paula Cimavilla-Roman ◽  
Miguel Angel Rodriguez-Perez ◽  
Javier Pinto
Keyword(s):  
Polymeric Nanocomposites ◽  
Free Standing ◽  
X Ray ◽  
Color Changes ◽  
Non Invasive ◽  
Silver Nps ◽  
Promising Solution ◽  
The Stability

The use of polymeric nanocomposites has arisen as a promising solution to take advantage of the properties of nanoparticles (NPs) in diverse applications (e.g., water treatment, catalysis), while overcoming the drawbacks of free-standing nanoparticles (e.g., aggregation or accidental release). In most of the cases, the amount and size of the NPs will affect the stability of the composite as well as their performance. Therefore, a detailed characterization of the NPs present on the nanocomposites, including their quantification, is of vital importance for the optimization of these systems. However, the determination of the NPs load is often carried out by destructive techniques such as TGA or ICP-OES, the development of non-invasive approaches to that aim being necessary. In this work, the amount of silver NPs synthesized directly on the surface of melamine (ME) foams is studied using two non-invasive approaches: colorimetry and X-ray radiography. The obtained results show that the amount of silver NPs can be successfully determined from the luminosity and global color changes of the surface of the foams, as well as from the X-ray attenuance.

Assaying Depleted Uranium in Bones In-Situ Using A Non-Invasive X-Ray Fluorescence Technique

1994 ◽  
Vol 38 ◽  
pp. 595-599
Author(s):  
P. Bloch ◽  
I.M. Shapiro
Keyword(s):  
Gamma Rays ◽  
Urine Analysis ◽  
Body Burden ◽  
Depleted Uranium ◽  
The Body ◽  
Scattered Photon ◽  
Fluorescence Technique ◽  
X Ray ◽  
Non Invasive

Abstract The occupational exposure to uranium associated with milling and fabrication of depleted uranium is presently assessed from bioassay of urine samples. The evaluation of the body-burden of uraninm from urine analysis has many difficulties and uncertainties associated with accounting for the bio-transport of inhaled uranium psrticles from the lungs, to absorption in the blood and excretion through the kidneys. The chemical toxicity of uranium and other transuranic elements is not fully understood, partially because of the difficulty of assessing the body burden of these metals in-situ. The transuranic elements are known to be deposited and retained in bone. A non-invasive X-ray fluorescence technique has been developed to assay the depleted uranium in bones in-situ. The K-shell electrons in uranium, which have a binding energy of 115.6 key are excited by the 122 and 136 keV gamma rays from a Co-57 source. A liquid N2 cooled intrinsic Ge-detector is employed to measure the characteristic K fluorescence from the uranium as well as the coherently scattered gamma raj's from the Co-57 source. The quantity of uranium in the bone is determined from the number of K fluorescence events extracted from the measured scattered photon spectrum. In addition, the bone mineral mass is determined from the number of coherently scattered gamma rays, permitting the assay of uranium to be expressed in terms of micrograms per unit mass bone. Using this system it was possible to measure molar concentrations of uranium with high precision and reproducibility.

Electrodeposition of manganese oxide from eutectic urea/choline chloride ionic liquid: An in situ study based on soft X-ray spectromicroscopy and visible reflectivity

2012 ◽  
Vol 211 ◽  
pp. 71-76 ◽  
Author(s):  
Benedetto Bozzini ◽  
Alessandra Gianoncelli ◽  
Burkhard Kaulich ◽  
Claudio Mele ◽  
Mauro Prasciolu ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Manganese Oxide ◽  
Choline Chloride ◽  
X Ray ◽  
In Situ Study
Sign in / Sign up

Export Citation Format

Share Document