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Microfluidic osmotic compression with operando meso-structure characterization using SAXS.

Dimitri Radajewski1, Pierre Roblin1, Patrice Bacchin1

  • 1Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS, Toulouse, France. yannick.hallez@univ-tlse3.fr.

Lab on a Chip
|April 15, 2025
PubMed
Summary
This summary is machine-generated.

Researchers created a microfluidic chip for nanoliter-scale osmotic compression. This allows real-time structural analysis using small-angle X-ray scattering (SAXS) on laboratory beamlines, advancing colloidal science.

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Biophysics

Background:

  • Microfluidic devices enable precise control over small sample volumes.
  • Small-angle X-ray scattering (SAXS) is a powerful technique for characterizing nanoscale structures.
  • Adapting synchrotron-based techniques to laboratory settings is crucial for broader accessibility.

Purpose of the Study:

  • To develop and validate a microfluidic chip for in situ and operando osmotic compression at the nanoliter scale.
  • To enable SAXS measurements compatible with laboratory X-ray sources.
  • To demonstrate the capability of tracking colloidal particle behavior during compression.

Main Methods:

  • Fabrication of a novel microfluidic chip designed for laboratory beamlines.
  • On-chip osmotic compression of silica colloidal particles (Ludox TM-50).
  • In situ and operando structural analysis using small-angle X-ray scattering (SAXS).
  • Monitoring X-ray absorbance and modeling scattered signals to track volume fraction.

Main Results:

  • Successful demonstration of osmotic compression and SAXS measurements on a microfluidic chip at a laboratory beamline.
  • Accurate tracking of colloidal particle volume fraction during compression.
  • Validation of the method for determining equations of state for colloidal suspensions.

Conclusions:

  • The developed microfluidic chip facilitates high-throughput, low-sample-volume structural analysis of colloidal systems.
  • This technology enables unambiguous determination of equations of state by precisely controlling osmotic pressure and salt chemical potential.
  • The chip has broad applications in understanding colloidal behavior, crystallization, nucleation, and interaction potentials.