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Does the aquatic invertebrate nipple array prevent bubble adhesion? An experiment using nanopillar sheets.

Euichi Hirose1, Hiroyuki Mayama, Akihiro Miyauchi

  • 1Faculty of Science, University of the Ryukyus, Nishihara, Okinawa, Japan. euichi@sci.u-ryukyu.ac.jp

Biology Letters
|August 30, 2013
PubMed
Summary

Aquatic invertebrates may use hydrophilic nipple arrays to repel bubbles, preventing buoyancy issues. This study mimicked these structures to test bubble adhesion on different surfaces.

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Area of Science:

  • Biomimetics
  • Surface Science
  • Invertebrate Biology

Background:

  • Nipple arrays are submicrometre structures on invertebrate cuticles.
  • Corneal nipples reduce glare in insects, but function in aquatic invertebrates is unknown.
  • Bubbles on aquatic organisms can impede movement and buoyancy.

Purpose of the Study:

  • To investigate the functional significance of nipple arrays in aquatic invertebrates.
  • To propose bubble repellence as a function of hydrophilic nipple arrays.
  • To analyze bubble adhesion properties on mimicked nipple surfaces.

Main Methods:

  • Utilized nanopillar sheets as a model for nipple arrays.
  • Compared bubble adhesion on hydrophilic and hydrophobic nanopillar surfaces versus flat surfaces.
Keywords:
Cassie–Baxter statebubble repellencecuticle surfacenanoimprint

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  • Evaluated bubble adhesion energy.

    • Main Results:

    • Fewer bubbles adhered to hydrophilic nanopillar surfaces compared to flat surfaces.
    • Hydrophobic surfaces showed significantly higher bubble adhesion than hydrophilic surfaces.
    • Surface wettability strongly influences bubble adhesion on mimicked nipple structures.

    Conclusions:

    • Hydrophilic nipple arrays likely function to repel bubbles in aquatic invertebrates.
    • This bubble repellence mechanism can mitigate buoyancy problems and movement interference.
    • Surface properties, particularly hydrophilicity, are crucial for the bubble-repelling function of nipple arrays.