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Related Experiment Videos

Confocal microscopy of a dense particle system.

E H C Bromley1, I Hopkinson

  • 1Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, United Kingdom.

Journal of Colloid and Interface Science
|November 18, 2005
PubMed
Summary

Cornflour starch granules are depleted from walls in pastes and pipe flow, with particle density decreasing significantly within 100 micrometers of the boundary. This study used confocal microscopy to analyze granule distribution.

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Area of Science:

  • Colloid and surface science
  • Materials science
  • Rheology

Background:

  • Understanding particle behavior near interfaces is crucial in various industrial processes, including food manufacturing and materials processing.
  • Cornflour starch granules, common in food products, exhibit complex interactions with surfaces.
  • Confocal microscopy offers high-resolution imaging for studying microscale phenomena.

Purpose of the Study:

  • To investigate the spatial distribution of cornflour starch granules relative to a wall in a paste.
  • To develop and apply a 3D particle identification algorithm for analyzing granule positions.
  • To examine particle behavior in both static and dynamic (pipe flow) systems.

Main Methods:

  • Utilized confocal microscopy with a 40x oil immersion lens to image starch granules (15 µm diameter).

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  • Employed a solvent matched to the refractive index of granules for imaging up to 120 µm depth.
  • Developed a 3D algorithm to accurately identify particle centers and measure number density and velocity.

    • Main Results:

    • Cornflour starch granules were found to be depleted from the wall.
    • This depletion zone extended approximately 100 micrometers from the wall.
    • The study successfully quantified particle number density and velocity in pipe flow.

    Conclusions:

    • Starch granule distribution is significantly influenced by proximity to boundaries.
    • The developed imaging and analysis techniques are effective for studying particle-wall interactions.
    • Findings have implications for controlling texture and stability in starch-based products.