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Capillary-driven binding of thin triangular prisms at fluid interfaces.

Joseph A Ferrar1, Deshpreet Singh Bedi, Shangnan Zhou

  • 1Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, USA. mjsolo@umich.edu.

Soft Matter
|May 5, 2018
PubMed
Summary
This summary is machine-generated.

Thin triangular prisms bind at water interfaces due to capillary forces. Their specific binding configurations, influenced by fabrication-induced bowing, enable self-assembly into ordered structures like the Kagome lattice.

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Area of Science:

  • * Soft Matter Physics
  • * Materials Science
  • * Interfacial Phenomena

Background:

  • * Capillary forces drive self-assembly of objects at fluid interfaces.
  • * The geometry and properties of interacting particles significantly influence assembly outcomes.
  • * Understanding interfacial interactions is key for designing novel materials and structures.

Purpose of the Study:

  • * To investigate capillary-driven binding between thin, equilateral triangular prisms at an air-water interface.
  • * To elucidate the role of prism geometry, specifically thickness-to-length ratio and bowing, in dictating binding configurations.
  • * To explore the potential for self-assembly into ordered structures.

Main Methods:

  • * Experimental observation of prism binding at the air-water interface.
  • * Fabrication of triangular prisms with varying thickness-to-length ratios (2-20 μm thickness, 120 μm edge length).
  • * Theoretical and numerical analysis of capillary interactions and interface profiles.

Main Results:

  • * Distinct binding configurations (tip-to-tip, tip-to-midpoint) observed for thickness-to-length ratios ≤ 1/10.
  • * Bowing of prisms leads to two polarity states and capillary hexapole-like interactions.
  • * All prism ratios self-assemble into space-spanning open networks.

Conclusions:

  • * Prism bowing and contact-line pinning are critical for directed capillary binding.
  • * The observed interactions enable the formation of highly directional binding events.
  • * Findings provide design parameters for fabricating building blocks for ordered open structures, including the Kagome lattice.