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Angular X-Ray Cross-Correlation Analysis (AXCCA): Basic Concepts and Recent Applications to Soft Matter and

Ivan A Zaluzhnyy1,2, Ruslan P Kurta3, Marcus Scheele4,5

  • 1Department of Physics, University of California San Diego, La Jolla, San Diego, CA 92093, USA. ivan.zaluzhnyy@gmail.com.

Materials (Basel, Switzerland)
|October 27, 2019
PubMed
Summary

Angular X-ray cross-correlation analysis (AXCCA) quantifies orientational order in soft matter. This technique analyzes X-ray diffraction patterns to reveal anisotropy in systems like liquid crystals and nanoparticle superlattices.

Keywords:
angular x-ray cross-correlation analysiscolloidal crystalshexactic phase in liquid crystalsorganic-inorganic mesocrystalsorientational ordersoft matter

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Area of Science:

  • Soft matter physics
  • Materials science
  • X-ray scattering techniques

Background:

  • X-ray diffraction patterns contain information about orientational order.
  • Anisotropy in X-ray scattering is challenging to quantify.
  • Soft matter systems exhibit complex orientational behavior.

Purpose of the Study:

  • To introduce Angular X-ray cross-correlation analysis (AXCCA).
  • To review recent applications of AXCCA in soft matter research.
  • To highlight the combination of AXCCA with X-ray microscopy.

Main Methods:

  • AXCCA evaluates the angular cross-correlation function of scattered X-ray intensity.
  • Averaging over multiple 2D diffraction patterns enhances anisotropic signals.
  • Integration with micro- or nanofocused X-ray microscopy enables high-resolution studies.

Main Results:

  • AXCCA provides quantitative measurements of angular anisotropy.
  • The technique has been successfully applied to diverse soft matter systems.
  • Studies reveal insights into orientational order in liquid crystals, colloidal crystals, and nanoparticle superlattices.

Conclusions:

  • AXCCA is a powerful tool for studying orientational order in soft matter.
  • The combination of AXCCA with advanced X-ray microscopy offers new possibilities.
  • This review summarizes key advancements and applications of AXCCA.