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Related Experiment Videos

Phase separation in a sheared gelatin/maltodextrin mixture studied by small-angle light scattering.

Michael F Butler1

  • 1Unilever Research and Development, Colworth House, Sharnbrook, Bedfordshire MK44 1LQ, UK. Michael.Butler@Unilever.com

Biomacromolecules
|November 12, 2002
PubMed
Summary

Shear influences gelatin/maltodextrin mixtures, affecting droplet size and structure formation during phase separation. High shear rates create stable fibrillar structures, while lower rates promote droplet coarsening and elongation.

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Area of Science:

  • Materials Science
  • Rheology
  • Polymer Science

Background:

  • Gelatin/maltodextrin mixtures exhibit complex phase behavior.
  • Understanding shear-induced structural changes is crucial for material processing.

Purpose of the Study:

  • To investigate the influence of shear on the microstructure of gelatin/maltodextrin mixtures during and after phase separation.
  • To elucidate the mechanisms of structure formation under various shear conditions.

Main Methods:

  • Small-angle light scattering (SALS) was employed to monitor structural evolution.
  • Experiments were conducted under both steady shear and quiescent conditions.

Main Results:

  • Phase separation occurred via spinodal decomposition, forming droplet morphologies.

Related Experiment Videos

  • Shear influenced droplet coarsening, breakup, and elongation.
  • At critical shear rates, elongated droplets and percolated structures formed.
  • High shear rates (100 s⁻¹) led to stable fibrillar morphologies, which broke up upon cessation of shear.

    • Conclusions:

    • Shear rate critically dictates the final microstructure of gelatin/maltodextrin mixtures.
    • Shear history is important when percolated structures form.
    • The study provides insights into shear-induced self-assembly in biopolymer mixtures.