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Updated: Jul 25, 2025

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In situ structural analysis with a SAXS laboratory beamline on a microfluidic chip.

Dimitri Radajewski1, Pierre Roblin1, Patrice Bacchin1

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Lab on a Chip
|June 30, 2023
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Summary

Researchers developed a lab-based X-ray scattering setup for microfluidic devices, eliminating the need for synchrotron facilities. This versatile system enables in situ and operando structural analysis of various nanomaterials and biomolecules.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Biophysics

Background:

  • Coupling microfluidic chips with X-ray equipment enables direct structural analysis within microfluidic devices.
  • Traditionally, this technique requires intense, small X-ray beams available only at synchrotron facilities.
  • Limitations include the accessibility and cost associated with synchrotron radiation sources.

Purpose of the Study:

  • To demonstrate reliable structural analysis using X-ray scattering in microfluidic devices without synchrotron access.
  • To evaluate the potential of an improved laboratory X-ray beamline and optimized microfluidic chip design.
  • To establish a versatile setup for in situ and operando structural analysis in lab-on-a-chip devices.

Main Methods:

  • Development of an optimized microfluidic device design.
  • Implementation of an improved laboratory X-ray beamline.
  • Small-angle X-ray scattering (SAXS) analysis of various dispersions within the microfluidic setup.

Main Results:

  • Reliable structural information was obtained from gold and silica nanoparticles, bovine serum albumin (BSA), and latex nanospheres.
  • The setup demonstrated its capability across a range of sample contrasts, from strong to weak.
  • Proof of concept for a versatile, lab-based SAXS system for microfluidic sample analysis was established.

Conclusions:

  • An accessible laboratory X-ray scattering setup can replace synchrotron sources for microfluidic structural analysis.
  • The developed system facilitates in situ and operando studies, advancing lab-on-a-chip capabilities.
  • This approach democratizes structural analysis for a wider range of scientific applications.