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X-ray linear dichroic ptychography.

Yuan Hung Lo1,2,3,4, Jihan Zhou1,2,3, Arjun Rana1,2,3

  • 1Department of Physics and Astronomy, University of California, Los Angeles, CA 90095.

Proceedings of the National Academy of Sciences of the United States of America
|January 13, 2021
PubMed
Summary
This summary is machine-generated.

Researchers mapped crystal orientations in coral skeletons using X-ray linear dichroic ptychography. This technique revealed nanoscale structural details, aiding the design of advanced biomimetic materials.

Keywords:
4D scanning transmission electron microscopyX-ray linear dichroismbiomineralscoherent diffractive imagingptychography

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Area of Science:

  • Materials Science
  • Biomineralization
  • Crystallography

Background:

  • Biominerals like coral skeletons exhibit unique nanoscale organization and optical anisotropy.
  • This organization dictates their exceptional mechanical properties, inspiring biomimetic material design.
  • Understanding crystal structure is key to replicating these properties.

Purpose of the Study:

  • To experimentally map the c-axis orientations of aragonite crystals in *Seriatopora aculeata* coral.
  • To demonstrate the utility of X-ray linear dichroic ptychography for analyzing optically anisotropic materials.
  • To investigate the nanoscale structure and formation mechanisms of coral skeletons.

Main Methods:

  • X-ray linear dichroic ptychography at the oxygen K-edge energy.
  • Linear dichroic phase imaging.
  • Four-dimensional (4D) scanning transmission electron microscopy (STEM).

Main Results:

  • X-ray ptychography revealed both narrow (<35°) and wide (>35°) c-axis angular spreads in coral aragonite crystals.
  • Strong polarization-dependent contrast was observed using linear dichroic phase imaging.
  • 4D STEM corroborated findings, showing evidence of disconnected corallite subdomains and jagged crystal boundaries.

Conclusions:

  • The combination of X-ray linear dichroic ptychography and 4D STEM is a powerful multimodal tool.
  • This approach enables the study of nano-crystallites, interfaces, nucleation, and mineral growth.
  • Findings provide insights into the formation of biominerals and inform the design of biomimetic structures.