scholarly journals Application of the X-ray absorption technique for monitoring hydration and setting processes in cementitious composites

2013 ◽  
Author(s):  
A. J. Klemm ◽  
P. Baker
Keyword(s):  
Cementitious Composites ◽  
X Ray ◽  
X Ray Absorption ◽  
Absorption Technique

scholarly journals Synchrotron X-Ray Absorption Spectroscopy Study of Self-Assembled Nanoparticles Synthesized from Fe(acac)3and Pt(acac)2

2012 ◽  
Vol 2012 ◽  
pp. 1-4 ◽  
Author(s):  
K. Chokprasombat ◽  
C. Sirisathitkul ◽  
P. Harding ◽  
S. Chandarak ◽  
R. Yimnirun
Keyword(s):  
Electron Microscopy ◽  
Fine Structure ◽  
Exafs Spectrum ◽  
Fept Nanoparticles ◽  
Spectroscopy Study ◽  
Edge Structure ◽  
X Ray ◽  
Monodisperse Nanoparticles ◽  
X Ray Absorption ◽  
Absorption Technique

The synchrotron X-ray absorption technique was used to complement electron microscopy in the investigation of nanoparticles synthesized from the coreduction of iron acetylacetonate, Fe(acac)3and platinum acetylacetonate, Pt(acac)2. A much higher Pt composition than Fe leads to an extended X-ray absorption fine structure (EXAFS) spectrum for the sample that differs from that of fcc FePt nanoparticles. Most importantly, X-ray absorption near-edge structure (XANES) spectra clearly indicate the existence ofα-Fe2O3and Pt metal. Since these monodisperse nanoparticles have a diameter of around 4 nm and tend to self-assemble into hexagonal arrangements, they can be modeled as Pt-rich cores with anα-Fe2O3shell stabilized by organic surfactants.

Study of Mixed Valent Alloys Sm1−x ScXS by X-Ray Absorption Technique

1987 ◽  
pp. 659-662 ◽  
Author(s):  
Rishi K. Singhal ◽  
K. V. R. Rao ◽  
Kavita S. Jerath ◽  
H. S. Chauhan ◽  
D. C. Jain ◽  
...  
Keyword(s):  
X Ray ◽  
X Ray Absorption ◽  
Absorption Technique

An X-Ray Absorption Technique for Measurement of Coat Weight on Paper

1960 ◽  
Vol 4 ◽  
pp. 309-318
Author(s):  
Haydn H. Murray ◽  
William D. Johns
Keyword(s):  
Absorption Coefficient ◽  
Production Control ◽  
Absorption Method ◽  
Linear Absorption Coefficient ◽  
Linear Absorption ◽  
Absorbing Medium ◽  
X Ray ◽  
Coating Layers ◽  
X Ray Absorption ◽  
Absorption Technique

AbstractAn X-ray absorption method was utilized to determine rapidly and precisely the thickness and weight of inorganic coating layers applied to paper. The mass absorption coefficient μ/ρ was calculated for kaolins and substituted in the following formulawhere I is the X-ray intensity after passing through a medium whose thickness is x centimeters, I0 Is the X-ray intensity before passing through a medium, μ. is the linear absorption coefficient, and ρ is the density of the absorbing medium.The film thickness was calculated and related to coat weight. Coated sheets of variable basis weight, utilizing different adhesives and coat weights, were used. The method is rapid and coating thicknesses can be determined with an accuracy of plus or minus 0.5μ and coat weight of plus or minus 0.2 lb. It is believed that the method can be adapted for production control on the paper coating machines.

Analysis of Diffusion Couples by X-Ray Absorption

1957 ◽  
Vol 1 ◽  
pp. 439-453
Author(s):  
Robert E. Ogilvie
Keyword(s):  
Diffusion Couple ◽  
X Rays ◽  
Diffusion Couples ◽  
Concentration Gradients ◽  
Absorption Coefficients ◽  
Transmitted Beam ◽  
X Ray ◽  
Diffusion Temperature ◽  
X Ray Absorption ◽  
Absorption Technique

AbstractWhen two metals are allowed to diffuse into one another, a diffusion aone is formed, the shape of which is determined by the relative diffusivities of the two elements, the time and temperature of the diffusion, and the number of phases existing in equilibrium at the diffusion temperature.An X-ray absorption technique has been developed to analyze such concentration gradients. This involves the preparation of a thin section from a typical diffusion couple parallel to its axis. This is then scanned with a monochromatic X-ray beam and the transmitted X-rays are measured with a Gejger counter. The intensity of the transmitted beam is determined by the composition of the area in question and the absorption coefficients of the two elements.

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