Anomalous small-angle X-ray scattering

According to anomalous small angle X-ray scattering (ASAXS), this compound slowly decomposes to release redispersible platinum nanoclusters with a mean diameter of 1.2 nm. The protective shell is formed on site by excess aluminium organics. 

Application. Anomalous X-ray diffraction (AXRD), anomalous wide-angle X-ray scattering (AWAXS), and anomalous small-angle X-ray scattering (ASAXS) are scattering methods which are selective to chemical elements. The contrast of the selected element with respect to the other atoms in the material is enhanced. The phase problem of normal X-ray scattering can be resolved, and electron density maps can be computed. 

S. Koh, J. Leisch, M.F. Toney, P. Strasser, Probing size and composition distribution dynamics of alloy nanoparticles in fuel cell electrodes using anomalous Small Angle X-ray Scattering (ASAXS), ECS fall meeting, Cancun, Mexico, 2006. 

Using Anomalous Small Angle X-Ray Scattering to Probe the Ion Atmosphere Around Nucleic Acids... 

Anomalous small angle X-ray scattering (ASAXS) exploits contrast variation methods to highlight the scattering from one elemental component in a multielement sample, such as one ion species in an ion-DNA system. The ASAXS... 

Jusufi, A., and Ballauff, M. (2006). Correlations and fluctuations of charged colloids as determined by anomalous small-angle X-ray scattering. Macromol. Theory Simul. 15, 193-197. 

Patel, M., Rosenfeldt, S., Ballauff, M., Dingenouts, N., Pontoni, D., and Narayanan, T. (2004). Analysis of the correlation of counterions to rod-like macroions by anomalous small-angle X-ray scattering. Phys. Chem. Chem. Phys. 6, 2962—2967. 

ANOMALOUS SMALL-ANGLE X-RAY SCATTERING IN ROD-LIKE POLYELECTROLYTES... 

Anomalous small-angle X-ray scattering in rod-like polyelectrolytes... 

Very recently, we [17-19] and others [20] have shown that anomalous small-angle X-ray scattering (ASAXS) can be used indeed for the study of polyelectrolytes. In particular, it was shown that ASAXS leads in general to three partial intensities [17] ... 

Register, R.A. Cooper, S.L. Anomalous small-angle x-ray scattering from a sulfonated polystyrene ionomer. Macromolecules 1988, 21, 1698. 

The resulting networks have been characterized by various methods such as TEM, X-ray absorption spectroscopy (XAS), anomalous small angle X-ray scattering (ASAXS), metastable impact electron spectroscopy (MIES), and ultraviolet photoelectron spectroscopy (UPS). These investigations have been summarized in a recent microreview [98]. 

Sim] Anomalous small-angle X-ray scattering < 25 at% Fe, 2-41 at% Ni, annealed at 500°C. Structure factors determination... 

Lyo] SEM, anomalous small-angle X-ray scattering Cu44Fei4Ni42 aged at 550°C. Partial factor structure determination... 

Lyo] Lyon, O., Simon, J.P., Anomalous Small-Angle X-Ray Scattering Determination of the Partial Structure Factors and Kinetic Study of Unmixed Cu-Ni-Fe Alloys , Phys. Rev. B, Cond. Matter, 35(10), 5164-5174 (1987) (ExperimentaL Kinetics, Phys. Prop., 23)... 

Technol, 8(3), 181-184 (1992) (Phase Diagram, Phase Relations, Experimental, 7) [1992Lyo] Lyon, O., Simon, J.P., Anisotropy of Partial Stmcture Factors in an Unmixed Cu-Ni-Fe Single Crystal Studied by Anomalous Small-Angle X-ray Scattering , J. Phys. Condens. Matter, 4(28), 6073-6086 (1992) (Crys. Stmcture, Experimental, Kinetics, 12)... 

LA. S.A. Prado, H. Wittich, K. Schulte, G. Goerigk, V.M. Garamus, R. WiLLUMEiT, S. Vetter, B. Ruff-MANN, S.P. Nunes, Anomalous Small-Angle X-Ray Scattering Characterization of Composites Based on Sulfonat-ed Poly(ether ether ketone). Zirconium Phosphates, and Zirconium Oxide. Journal of Polymer Science-Physics 42 (2003) 567-575. 

More recently, we demonstrated that anomalous small-angle X-ray scattering (ASAXS) can be used for the same purpose if rubidium counterions are used. Here the K-absorption edge can be reached by use of synchrotron radiation of suitable energy. The contrast of the Rb counterions is markedly diminished while the contrast of the core and the polyelectrolyte chains stays constant. Hence, using the anomalous dispersion of the Rb ions, the scattering contribution of the macroion and the counterions can be determined separately. 

Yu CF, Koh S, Leisch JE, Toney MF, Strassca- P (2008) Size and composition distribution dynamics of alloy nanoparticle electrocatalysts probed by anomalous small angle X-ray scattering (ASAXS). Faraday Discuss 140 283-296... 

Haas S, Hoell A, Zehl G, Dorbandt 1, Bogdanoff P, Fiechter S (2008) Structural investigation of carbon supported Ru-Se based catalysts using anomalous small angle X-ray scattering. ECS Trans 6 127-138... 

The general formula RuSe describes rathenium particles that are modified by a small amount of selenium the optimum activity is achieved for x 0.1. As obtained from anomalous small angle X-ray scattering (ASAXS) measurements, ruthenium forms almost spherical nanoparticles from which the selenium content is deposited onto the surface. The typical size of the rathenium particles is around 2.5 mn selenium forms small clusters on the surface with a diameter <0.6 nm. A mixing of the two components has not been observed. From extended X-ray absorption fine structure (EXAFS) analysis an oxygen-free selenium structure and oxygen-containing species on the uncovered rathenium surface... 

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