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Showing 1 to 20 of 36 for “"X-Ray Reflectivity"”.
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Magnetic X-ray Reflectivity
… multilayer systems via magnetic soft and hard x-ray reflectivity. The focus here is on 3d transition metals, which are used mainly for development of numerous noval magnetic devices, that are both technologically and scientifically interesting. Complementary to Neutron diffraction, which is the …
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The equilibrium shape of NaCl single crystal studied by x-ray reflection on its surfaces
… of NaCl single crystals has been studied by x-ray reflectivity measurements at high symmetric surfaces. The equilibrium shape of a crystal is related to the properties of its surfaces through its surface free energy by means of the Wulff construction. Glancing angle x-ray reflectivity is used …
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X -Ray Studies of Metal Thin Film Growth on Semiconductors
X-ray reflectivity measurements have been performed for an investigation of the structure of Ag films deposited in situ on Ge(111) over the thickness range of 3--15 monolayers. The films deposited at a substrate temperature of 110 K are not well ordered, but become well ordered upon annealing, as …
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Mechanism of C -Cadherin Binding: Multiple Adhesive Alignments and a Multi-Stage Unbinding Trajectory
… are disrupted by calcium removal. Using x-ray reflectivity, we measure preliminary electron density profiles of the C-cadherin layers and their supporting lipids, normal to the air-water interface. These electron density profiles are used to estimate the dimensions of the cadherin and the …
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X-ray studies of metal thin film growth on semiconductors
Real time in situ synchrotron x-ray studies of continuous Pb deposition on Si(111)-(7 × 7) at 180 K reveal an unusual growth behavior. A wetting layer forms first to cover the entire surface. Then islands of a fairly uniform height of about five monolayers form on top of the wetting layer and grow …
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A comparative study of metrology techniques for porous organic thin films
… indirect, such as optical ellipsometry and X-Ray Reflectivity; or pose problems for industrial use, involving radioactivity such as Positronium Annihilation Lifetime Spectroscopy and Small Angle Neutron Scattering. Atomic Force Microscopy is limited to surface analysis, and pores may be …
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How water meets a hydrophobic surface: reluctantly and with fluctuations
… ellipsometry, surface plasmon resonance, and X-ray reflectivity. Both ellipsometry and X-ray reflectivity provide strong evidence for the low-density layer and illuminate unexpected temporal behavior. Using all three techniques, we found surprising fluctuations at the interface with a …
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Graphitic Surface Attachment by Single-Stranded DNA and Metal Nanoparticles
… Electron Microscope, and performing X-ray reflectivity of a single-stranded DNA film on graphite. The TEM study shows that the DNA bunches up along tubes but does not tend to clump on single tubes. Helical wrapping is not seen on single tubes. X-ray reflectivity shows that DNA on a …
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Fabrication and characterization of multilayers for focusing hard x-ray optics
… thicknesses and their performance as x- ray mirrors for the next generation of focusing telescopes. Different material combinations were studied for the first time employing a consistent methodology for the DC magnetron sputtering growth of the multilayers and their characterization by …
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Lanthanide Binding Tag Peptides for Selective Separation of Rare Earth Elements
… and are collected in foam. Surface tension, x-ray reflectivity, and fluorescence techniques demonstrate selective interfacial adsorption of Tb<sup>3+</sup>. Cross-linking with glutaraldehyde enhances foam stability and separation efficiency. (2) Self-assembly of LBT:REE complexes into nanoscale …
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Influence of protein and lipid domains on the structure, fluidity and phase behavior of lipid bilayer membranes
… separation with fluorescence microscopy and X-ray reflectivity. To model cellular protein coatings and peripheral proteins, we prepare biotin-functionalized membranes that bind the proteins streptavidin and avidin. Fluorescence microscopy studies demonstrate that proteins crystallized in a …
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Structural and magnetotransport study of SrTiO3-δ/Si structures grown by molecular beam epitaxy
… of high crystalline quality as verified by x-ray diffraction (XRD), transmission electron microscopy (TEM), and were atomically flat as verified by atomic force microscopy (AFM), with rms roughness of less than 0.5nm measured by AFM. The thickness was measured by x-ray reflectivity. Transport …
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Magnetization Dynamics in Ultrathin Films and Multilayers
… of these thin films. This is also confirmed by X-ray diffraction (XRD) and X-ray reflectivity (XRR) measurements. These films are particularly interesting because of their well known superior magnetostrictive behavior. Motivated from previous FMR experiments in IrMn/CoFe and MnN/CoFeB exchange …
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X-ray studies of gallium arsenide-silicon heterostructures
… the film and at the interface. We employ x-ray scattering to explore the structural properties of these layered materials grown by molecular beam epitaxy. The thermal expansion of thick GaAs films on nominal Si(001) is measured with x-ray diffraction. The gallium arsenide film exhibits an …
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Ion implantation for figure correction of high-resolution x-ray telescope mirrors
… for future high-resolution, large-aperture x-ray telescopes continues to challenge the x-ray astronomy instrumentation community. Building a large-aperture telescope requires thin, lightweight mirrors; due to the very low stiffness of thin mirrors, these are difficult to fabricate, coat, and …
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Analysis of hairy-rod polyimides for photoalignment
… but no surface anisotropy could be observed. X-ray reflectivity measurements showed film shrinkage after in-situ UV irradiation with identical trends as was observed for the collapse of the LC pretilt. Modeling revealed an increased electron density at the surface and a less diffuse interface …
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Structural Elucidation of the Interaction Between Neurodegenerative Disease-Related Tau Protein with Model Lipid Membranes
… of tau and model membranes, we utilized X-ray and neutron scattering techniques. X-ray reflectivity indicated tau aggregated at air/water and anionic lipid membrane interfaces and penetrated into membranes. More significantly, membrane interfaces induced tau protein to partially adopt a …
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Static and ultrafast optical properties of nanolayered composites : gold nanoparticles embedded in polyelectrolytes
… The structures were characterized by X-ray reflectivity measurements, which reveal Bragg peaks up to the seventh order, evidencing the high stratication of the particle layers. In the same measurements pronounced Kiessig fringes were observed, which indicate a low global roughness of the …
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Grazing Incidence X-ray Scattering from Magnetic Thin Films and Nanostructures
Grazing incidence scattering of synchrotron x-rays has been used to characterize the structure of magnetic thin films and periodic nanostructures. The combined metal and metal oxide films have been chosen to clarify the effects of growth processing techniques in technologically important magnetic …
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Quantum Electronic Effects in Ultrathin Metal Films on Semiconductors
… then investigated experimentally using surface x-ray diffraction at a third-generation synchrotron radiation facility (the Advanced Photon Source at Argonne National Laboratory). Extended reflectivity spectra from smooth atomic-scale Pb films prepared on Si(111) substrates at 110 K are obtained …
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