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Heterogeneous Capillary Interactions of Interface-Trapped Ellipsoid Particles Using the Trap-Release Method.

Jin Hyun Lim1, Jun Young Kim2, Dong Woo Kang1

  • 1Department of Chemical Engineering, Kyung Hee University , Yongin 17104, South Korea.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 13, 2017
PubMed
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Capillary interactions between ellipsoid particles at oil-water interfaces are heterogeneous and vary between particle pairs. These forces, driven by interface deformation, follow a power law and increase with particle aspect ratio in specific configurations.

Area of Science:

  • Colloid and Interface Science
  • Soft Matter Physics
  • Nanotechnology

Background:

  • Capillary forces significantly influence the behavior of particles at liquid-liquid interfaces.
  • Understanding these forces is crucial for applications in materials science, emulsions, and microfluidics.
  • Ellipsoid particle geometry introduces complexities in interface deformation and resulting interactions.

Purpose of the Study:

  • To quantify heterogeneous capillary interactions between ellipsoid particles at the oil-water interface.
  • To investigate the influence of particle configuration (tip-to-tip and side-to-side) on capillary forces.
  • To determine the relationship between particle aspect ratio and capillary interaction strength.

Main Methods:

  • Utilized optical laser tweezers (double-trap method) to manipulate and measure interactions between two ellipsoid particles.

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  • Analyzed particle movement post-release from traps using image analysis and Stokes drag force calculations.
  • Varied particle configurations (tip-to-tip and side-to-side) and aspect ratios (E).

    • Main Results:

    • Measured capillary interactions were found to be heterogeneous, varying between different particle pairs.
    • Capillary attraction arises from interface deformation (quadrupolar) caused by particle presence.
    • A power law Ucap ≈ r-β with β ≈ 4 described long-range interactions, independent of aspect ratio and configuration.
    • For tip-to-tip configurations, capillary force magnitude increased proportionally with aspect ratio (E > 1).

    Conclusions:

    • Heterogeneity in capillary interactions is attributed to undulations in the interface meniscus, potentially due to particle chemical or geometric variations.
    • The observed power law and aspect ratio dependence provide quantitative insights into particle assembly at interfaces.
    • Findings are critical for designing and controlling self-assembly processes involving non-spherical particles.