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Quantitative imaging methods for heterogeneous multi-component films.

Ellard Hooiveld1, Maarten Dols1, Jasper van der Gucht1

  • 1Physical Chemistry and Soft Matter, Wageningen University & Research, Stippeneng 4, 6708 WE Wageningen, The Netherlands. hanne.vanderkooij@wur.nl.

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|November 13, 2023
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Summary
This summary is machine-generated.

Analyzing multi-component films during drying reveals spontaneous component segregation. This study compares three techniques—confocal Raman microscopy, cross-sectional Raman microscopy, and SEM-EDX—for high-resolution analysis without sample customization.

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Area of Science:

  • Materials Science
  • Colloid Science
  • Surface Science

Background:

  • Drying of multi-component dispersions is crucial in coatings, inks, food, and cosmetics.
  • Component segregation during drying impacts macroscopic film properties.
  • Current analysis methods are limited to specific sample types.

Purpose of the Study:

  • To compare three label-free imaging techniques for analyzing segregation in drying multi-component films.
  • To provide a guide for experimental steps and data analysis.
  • To assist researchers in selecting appropriate methods for structure quantification.

Main Methods:

  • Confocal Raman microscopy for 3D visualization.
  • Cross-sectional Raman microscopy for deeper analysis.
  • Scanning Electron Microscopy with Energy Dispersive X-ray analysis (SEM-EDX) for high-resolution microseparation detection.

Main Results:

  • All three techniques successfully visualized segregation without sample customization.
  • Confocal Raman microscopy's accuracy decreases with depth.
  • Cross-sectional Raman and SEM-EDX are superior for deeper and finer segregation analysis, respectively.
  • SEM-EDX revealed subtle lateral microseparations.

Conclusions:

  • The study provides a comparative analysis of label-free techniques for studying drying-induced segregation.
  • Researchers can choose the most suitable method based on their specific needs for analyzing multi-component films.
  • The findings aid in understanding and controlling structure formation in dried films.