Development of Ultrasmall-Angle X-ray Scattering - X-ray Photon Correlation Spectroscopy

Published

February 1, 2011

Author(s)

Fan Zhang, Andrew J. Allen, Lyle E. Levine, Jan Ilavsky, Gabrielle G. Long, Anthony M. Santana

Abstract

In this paper, we present the development of ultrasmall-angle X-ray scattering - X-ray photon correlation spectroscopy (USAXS-XPCS). This technique takes advantage of Bonse-Hart crystal optics and is capable of probing the slow equilibrium and nonequilibrium dynamics of optically opaque materials with prominent scattering features in a scattering vector range between those of dynamical light scattering and conventional XPCS. Instrumental parameters for optimal coherent-scattering operation are described. We offer two examples to illustrate the applicability and capability of USAXS-XPCS. The first example concerns the equilibrium dynamics of colloidal dispersions of polystyrene microspheres in glycerol at 10 %, 15 % , and 20 % volume concentrations. The temporal intensity autocorrelation analysis shows that the relaxation time of the microspheres exhibits a monotonic decay as the scattering vector increases. The second example concerns the nonequilibrium dynamics of a polymer nanocomposite, for which it is demonstrated that USAXS-XPCS measurements can reveal incipient dynamical changes not observable by other techniques.

Citation

Journal of Applied Crystallography

Volume

44

Pub Type

Journals

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Keywords

X-ray photon correlation spectroscopy, ultra-small-angle X-ray scattering, equilibrium dynamics, nonequilibrium dynamics, coherent X-ray scattering

Citation

Zhang, F. , Allen, A. , Levine, L. , Ilavsky, J. , Long, G. and Santana, A. (2011), Development of Ultrasmall-Angle X-ray Scattering - X-ray Photon Correlation Spectroscopy, Journal of Applied Crystallography, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=906111 (Accessed December 7, 2024)