A5054629979- Advanced ceramic materials synthesis
- X-ray Diffraction in Crystallography
- High-Temperature Coating Behaviors
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced X-ray Imaging Techniques
- Metal and Thin Film Mechanics
- Nuclear Physics and Applications
- Electron and X-Ray Spectroscopy Techniques
- Material Dynamics and Properties
- Nuclear Materials and Properties
- Advanced materials and composites
- Glass properties and applications
- Microstructure and mechanical properties
- Aluminum Alloy Microstructure Properties
- Advanced X-ray and CT Imaging
- High-pressure geophysics and materials
- Quasicrystal Structures and Properties
- Aluminum Alloys Composites Properties
- Intermetallics and Advanced Alloy Properties
- Hydrogen embrittlement and corrosion behaviors in metals
- Medical Imaging Techniques and Applications
- Polymer crystallization and properties
- Orthopaedic implants and arthroplasty
- Ion-surface interactions and analysis
- Crystallography and Radiation Phenomena
Université de Montréal
2022
National Institute of Standards and Technology
2002-2018
Material Measurement Laboratory
2011-2018
Argonne National Laboratory
2006-2018
National Institute of Standards
1987-2012
Scientific Services
2011
Indian Association for the Cultivation of Science
2011
Brookhaven National Laboratory
2008-2009
Lawrence Berkeley National Laboratory
2008-2009
SLAC National Accelerator Laboratory
2008-2009
Absolute calibration of small-angle scattering (SAS) intensity data (measured in terms the differential cross section per unit sample volume solid angle) is essential for many important aspects quantitative SAS analysis, such as obtaining number density, fraction, and specific surface area scatterers. It also enables from different instruments (light, X-ray, or neutron scattering) to be combined, it can even useful detect existence artifacts experimental data. Different primary secondary...
The design and operation of a versatile ultra-small-angle X-ray scattering (USAXS) instrument at the Advanced Photon Source (APS) Argonne National Laboratory are presented. is optimized for high brilliance low emittance an APS undulator source. It has angular energy resolutions order 10 −4 , accurate repeatable tunability over its operational range from 8 to 18 keV, dynamic intensity 9 depending on configuration. further offers quantitative primary calibration cross sections, vector 0.0001 1...
We report the results of highly sensitive transmission X-ray scattering measurements performed at Advanced Photon Source, Argonne National Laboratory, on nearly fully dense high-purity amorphous-silicon (a-Si) samples for purpose determining their degree hyperuniformity. A perfectly hyperuniform structure has complete suppression infinite-wavelength density fluctuations, or, equivalently, factor S ( q →0) = 0; smaller value (0), higher Annealing was observed to increase hyperuniformity in...
During tensile creep of a hot isostatically pressed (HIPed) silicon nitride, the volume fraction cavities increases linearly with strain; these produce nearly all measured strain. In contrast, compressive in same stress and temperature range produces very little cavitation. A exponent that (ε∞σ n , 2 < 7) characterizes response, while response exhibits dependence unity. Furthermore, under temperature, material creeps 100 times faster tension than compression. Transmission electron...
To understand the influence of processing parameters on microstructure plasma‐sprayed deposits, smallangle neutron scattering measurements were made processing‐parameter‐dependent specific surface area voids in gray alumina deposits. These studies indicate that are form pores between splats and around inclusions or unmelted particles, also cracks within which may develop during cooling. The porous volume increases as angle spray gun substrate (the “spray angle”) decreases. This study...
The design and operation of a new small-angle X-ray scattering instrument, optimized for high throughput at synchrotron source, angular wavelength resolution, large sample cross-sectional area, accurate energy tuning, excellent signal-to-noise ratio harmonic rejection are presented. principles implementation given, as the details primary calibration absolute intensity experimental desmearing. instrument has been tested application to anomalous-scattering measurements near chromium K edge....
Small-angle scattering is widely used for measuring materials microstructure in the 1–100 nm size range. Ultrasmall-angle x-ray (USAXS), typically achieved through crystal collimation, extends this range to include features over 1 μm size. This article reports on USAXS UNICAT beam line 33-ID at Advanced Photon Source. The instrument makes use of a six-reflection pair as collimator and another an analyzer. First principle absolute calibration broad vector make very effective instrument,...
Given its leading role in high-performance computing for modeling and simulation many experimental facilities, the US Department of Energy has a tremendous need data-intensive science. Locating challenges commonalities among three case studies illuminates, detail, technical involved realizing
This paper reports recent tests performed on the Bonse–Hart-type ultra-small-angle X-ray scattering (USAXS) instrument at Advanced Photon Source with higher-order reflection optics – Si(440) instead of Si(220) and energies greater than 20 keV. The results obtained demonstrate feasibility high-energy operation narrower crystal reflectivity curves, which provides access to a q range from ∼2 × 10 −5 1.8 Å −1 up 12 decades in associated sample-dependent intensity range. corresponding size...
Carbon black is a common polymer additive that used for reinforcement and its ability to enhance physical properties, such as conductivity. This article pertains an X-ray scattering (SAXS) study of conductive grade carbon black–polymer composites. The pattern blacks displays surface-fractal-like power-law decay over many decades in vector q. It often assumed small-angle from aggregates can be described terms surface-fractal models, related particles with fractally rough surfaces. Such...
A new colloidal stabilization mechanism, known as nanoparticle "haloing" (Tohver, V.; Smay, J. E.; Braem, A.; Braun, P. Lewis, A. Proc. Natl. Acad. Sci. U.S.A. 2001, 98, (16), 8950-8954), has been predicted theoretically and inferred experimentally in microsphere-nanoparticle mixtures that possess high charge size asymmetry. The term "halo" implies the existence of a nonzero separation distance between highly charged nanoparticles negligibly microspheres they surround. By means...
A new transmission X-ray imaging technique using ultra-small-angle scattering (USAXS) as a contrast mechanism is described. USAXS can sometimes provide in cases where radiography and phase-contrast are unsuccessful. Images produced at different vectors highlight microstructural features within the same sample volume. When used conjunction with scans, provides substantial quantitative qualitative three-dimensional information on sizes, shapes spatial arrangements of objects. The demonstrated...
This paper describes the results from multidisciplinary characterization/scattering techniques used for quantitative characterization of industrial thermal barrier coating (TBC) systems in advanced gas turbines. While past requirements TBCs primarily addressed function insulation/life extension metallic components, new demands necessitate a requirement spallation resistance/strain tolerance, i.e., prime reliance, on part TBC. In an extensive effort to incorporate these TBCs,...