A5055956211- X-ray Diffraction in Crystallography
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced X-ray Imaging Techniques
- Advanced ceramic materials synthesis
- Nuclear Physics and Applications
- Medical Imaging Techniques and Applications
- Metal and Thin Film Mechanics
- Scientific Computing and Data Management
- Ion-surface interactions and analysis
- Distributed and Parallel Computing Systems
- Superconducting Materials and Applications
- CCD and CMOS Imaging Sensors
- Catalytic Processes in Materials Science
- Particle Detector Development and Performance
- Machine Learning in Materials Science
- Material Dynamics and Properties
- Hydrogels: synthesis, properties, applications
- Fusion materials and technologies
- Radiation Shielding Materials Analysis
- Boron and Carbon Nanomaterials Research
- Electron and X-Ray Spectroscopy Techniques
- Optical Imaging and Spectroscopy Techniques
- Advanced Chemical Physics Studies
- Advanced X-ray and CT Imaging
- Aluminum Alloys Composites Properties
Argonne National Laboratory
2013-2023
The University of Tokyo
2020
University of Illinois Urbana-Champaign
1998-2008
Purdue University West Lafayette
2008
University of Massachusetts Amherst
2007
Keyano College
2006
University of Delaware
2006
Northern Illinois University
2006
Advanced Photon Source
2004
Knox College
2002
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...
Following many years of evolutionary development, first at the National Synchrotron Light Source, Brookhaven Laboratory, and then Advanced Photon Source (APS), Argonne APS ultra-small-angle X-ray scattering (USAXS) facility has been transformed by several new developments. These comprise a conversion to higher-order crystal optics higher energies as standard operating mode, rapid fly scan measurements also operational automated contiguous pinhole small-angle (SAXS) intermediate vectors,...
NeXus is an effort by international group of scientists to define a common data exchange and archival format for neutron, X-ray muon experiments. built on top the scientific HDF5 adds domain-specific rules organizing within files, in addition dictionary well defined field names. The has two purposes. First, it defines that can serve as container all relevant associated with beamline. This very important use case. Second, standards form application definitions between applications. provides...
A beam of monochromatic synchrotron x-ray incident on a silicon wafer creates rich intensity pattern behind the that reflects cross section scattering by thermally populated phonons. least-squares fit patterns based lattice dynamics calculation yields phonon dispersion relations over entire reciprocal space. This simple and efficient method is suitable for studies in essentially all materials, complements traditional neutron technique.
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,...
We observe large-scale structures in hydrogels of poly(l-lactide)-poly(ethylene oxide)-poly(l-lactide) (PLLA-PEO-PLLA) ranging size from a few hundred nanometers to several micrometers. These are apparent through both ultra-small angle scattering (USAS) techniques and confocal microscopy. The showed power law the USAS regime, which is indicative fractal structures. dimension revealed that gels have large aggregates with mass structure over nanometer-to-micrometer length scales. also seem...
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...
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...
The performance of the new 52 kHz frame rate Rigaku XSPA-500k detector was characterized on beamline 8-ID-I at Advanced Photon Source Argonne for X-ray photon correlation spectroscopy (XPCS) applications. Due to large data flow produced by this (0.2 PB per 24 h continuous operation), a workflow system deployed that uses data-management (DM) and high-performance software rapidly reduce area-detector multi-tau two-time functions in near real time, providing human-in-the-loop feedback...
Results are presented for an in situ synchrotron-based ultra-small-angle X-ray scattering (USAXS) study of the solution-mediated formation and growth nanocrystalline ceria (n-CeO 2 ) using a new remote-controlled, isothermal, circulating fluid flow cell. The mitigates or reduces beam-induced damage, air bubbles particulate flocculation within bulk solution, but prevents any coarse particulates that do form from settling out suspension. Combined with large-scale range accessible USAXS...
The formation of Al nanocrystals from an amorphous Al92Sm8 alloy involves kinetic phenomena with very different characteristic length and timescales, including initial nucleation later growth coarsening. Insight into these processes can be derived the evolution sizes as a function time. Synchrotron small angle x-ray scattering (SAXS) experiments provide information about nanocrystal size distribution, particularly at times after has reached saturation. Accurately interpreting distribution...
Intensity distribution of x-ray scattering by thermal phonons in Si was recorded using synchrotron undulator radiation. A high-energy beam sent through a Si(111) wafer transmission Laue geometry yielded threefold symmetric pattern for the cross section with rich details governed phonon dispersion, population, and polarization.
To determine the suitability of commonly used windows for small-angle X-ray scattering, a range materials, including Kapton, (aluminized) Mylar, beryllium, high-purity aluminium foil, mica and silicon nitride have been studied. At small wavevector transfers, Q, in 2 × 10−3 to 0.2 nm−1, scattering from beryllium is reasonably well described by power laws Q with exponents −3.25, −3.6 −3.9, respectively. There are large variations mica, but freshly cleaved natural window was far weakest...
A general treatment of X-ray imaging contrast for ultra-small-angle scattering (USAXS) is presented; this approach makes use phase propagation and dynamical diffraction theory to account quantitatively the intensity distribution at detector plane. Simulated results from a model system micrometre-sized spherical SiO 2 particles embedded in polypropylene matrix show good agreement with experimental measurements. Simulations by means separate geometrical ray-tracing method also features USAXS...
Brownian motion of Cowpea mosaic virus (CPMV) in water was measured using small-angle X-ray photon correlation spectroscopy (SA-XPCS) at 19.2 µs time resolution. It found that the decorrelation τ(Q) = 1/DQ2 up to Q 0.091 nm-1. The hydrodynamic radius RH determined from XPCS Stokes-Einstein diffusion D kT/(6πηRH) is 43% larger than geometric R0 SAXS 0.007 M K3PO4 buffer solution, whereas it 80% for CPMV 0.5 NaCl and 104% (NH4)2SO4, a possible effect aggregation as well slight variation...
Electrochemical interfaces are key to the direct conversion of fuels electrical energy and lend converters like solid oxide fuel cells (SOFC) their functionality. Over extended operation at high temperatures, microstructure underlying component materials in cathodes, anodes electrolytes evolve an extent that these become affected ultimately impaired, giving rise performance degradation. We present anomalous ultra-small-angle X-ray scattering (anomalous USAXS) measurements quantify phase...
Small‐angle X‐ray scattering was used to follow the evolution of pore size distribution during final‐stage sintering alumina and doped with 0.25 wt% magnesia. The volume‐weighted (Guinier) results indicate that effective largest pores increases as body goes from 97% more than 99% dense. surface‐area‐weighted (Porod) show median smallest decreases slightly over same density range. Taken together, these data becomes broader densification proceeds. This confirmed by a maximum entropy analysis,...
Monolithic silica aerogels with radial symmetry were synthesized by supercritical drying, doped to 2% and 10% cobalt, reduced hydrogen. All samples investigated ultra-small-angle X-ray scattering. The non-doped have three populations of scatterers radii gyration about 10, 40 60–70 Å. show an additional structure a radius ranging from 1050 3000 This causes intensity oscillations, thus revealing relatively narrow size distribution. Scattering curves the 10%-doped fitted well...