A gradient method for anomalous small-angle x-ray scattering

Jemian, P.R.; Weertman, J.; Long, G. G.

doi:10.2172/10149708

Cited by 2 publications

(3 citation statements)

References 2 publications

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“…Background scattering, typically small compared to the scattering of samples, was subtracted from raw profiles, as shown in Figure c. Finally, profiles were tested for distortion, Figure d, using Lake’s method and the geometry of the beamline setup . Desmeared intensities were found to correspond almost exactly to the experimental (smeared) data.…”

Section: Methodsmentioning

confidence: 95%

“…Finally, profiles were tested for distortion, Figure 2d, using Lake's method 52 and the geometry of the beamline setup. 53 Desmeared intensities were found to correspond almost exactly to the experimental (smeared) data. Therefore, the beam optics at the APS experimental station introduced minimal distortion.…”

Section: Data Visualization and Processing Scanning Probe Imagementioning

confidence: 99%

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Characterization of Physically and Chemically Separated Athabasca Asphaltenes Using Small-Angle X-ray Scattering

et al. 2011

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Athabasca asphaltenes were characterized using small-angle X-ray scattering (SAXS). Two methods were used to separate asphaltenes from the Athabasca bitumen: namely, chemical separation by precipitation with n-pentane and physical separation by nanofiltration using a zirconia membrane with a 20 nm average pore size. The permeate and chemically separated samples were diluted in 1-methylnaphtalene and n-dodecane prior to SAXS measurements. The temperature and asphaltene concentration ranges were 50À310 °C and 1À10.4 wt %, respectively. Model-independent analysis of SAXS data provided the radius of gyration and the scattering coefficients. Model-dependent fits provided size distributions for asphaltenes assuming that they are dense and spherical. Model-independent analysis for physically and chemically separated asphaltenes showed significant differences in nominal size and structure, and the temperature dependence of structural properties. The results challenge the merits of using chemically separated asphaltene properties as a basis for asphaltene property prediction in hydrocarbon resources. While the residuals for model-dependent fits are small, the results are inconsistent with the structural parameters obtained from modelindependent analysis.

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Section: Methodsmentioning

confidence: 95%

Section: Data Visualization and Processing Scanning Probe Imagementioning

confidence: 99%

Characterization of Physically and Chemically Separated Athabasca Asphaltenes Using Small-Angle X-ray Scattering

et al. 2011

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“…In the dilute approximation, scattering is only a function of the form factor, or size and shape of the particles or voids. 1 1 In this approximation, and for a single population of scatterers, the scattering can be written in the following form [28], [29]:…”

Section: Damage: In Situ Void Nucleation and Growthmentioning

confidence: 99%

Shocked materials at the intersection of experiment and simulation

et al. 2008

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Understanding the dynamic lattice response of solids under the extreme conditions of pressure, temperature and strain rate is a scientific quest that spans nearly a century. Critical to developing this understanding is the ability to probe and model the spatial and temporal evolution of the material microstructure and properties at the scale of the relevant physical phenomena-nanometers to micrometers and picoseconds to nanoseconds. While experimental investigations over this range of spatial and temporal scales were unimaginable just a decade ago, new technologies and facilities currently under development and on the horizon have brought these goals within reach for the first time. The equivalent advancements in simulation capabilities now mean that we can conduct simulations and experiments at overlapping temporal and spatial scales. In this article, we describe some of our studies which exploit existing and new generation ultrabright, ultrafast x-ray sources and large scale molecular dynamics simulations to investigate the real-time physical phenomena that control the dynamic response of shocked materials.

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A gradient method for anomalous small-angle x-ray scattering

Cited by 2 publications

References 2 publications

Characterization of Physically and Chemically Separated Athabasca Asphaltenes Using Small-Angle X-ray Scattering

Characterization of Physically and Chemically Separated Athabasca Asphaltenes Using Small-Angle X-ray Scattering

Shocked materials at the intersection of experiment and simulation

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