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A bioinspired wet/dry microfluidic adhesive for aqueous environments.

Abhijit Majumder1, Ashutosh Sharma, Animangsu Ghatak

  • 1Department of Chemical Engineering, Indian Institute of Technology, Kanpur 208016, India.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 30, 2009
PubMed
Summary

This study introduces a novel, reusable elastic adhesive with subsurface microstructures that excels in both air and underwater conditions. Its unique mechanical design ensures robust adhesion on various surfaces without performance degradation over time.

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Area of Science:

  • Materials Science
  • Adhesion Science
  • Biomimetics

Background:

  • Developing robust adhesives for diverse environments, including underwater, is crucial for applications in biomedical, marine, and automotive fields.
  • Natural adhesives often feature complex subsurface structures, inspiring novel synthetic approaches.
  • Existing adhesives frequently suffer from performance degradation in wet conditions or over time.

Purpose of the Study:

  • To engineer a pressure-sensitive, nonreacting, and nonfouling adhesive with enhanced performance in both air and underwater environments.
  • To investigate the role of subsurface microstructures in improving adhesive energy and performance.
  • To explore the potential of liquid-filled channels within microstructures to further enhance adhesion.

Main Methods:

  • Fabrication of thin elastic adhesive films using poly(dimethylsiloxane) (PDMS) with embedded subsurface microstructures.
  • Investigation of adhesive performance in both dry (air) and wet (underwater) conditions.
  • Analysis of how subsurface structures and liquid filling influence adhesion mechanics and stress profiles.

Main Results:

  • The presence of subsurface microstructures significantly enhances adhesion energy in both air and underwater.
  • Filling microchannels with liquids of specific surface tension further boosts adhesive performance by modifying internal stress.
  • Adhesion is primarily governed by mechanical principles, making it largely unaffected by water presence and compatible with hydrophobic and hydrophilic surfaces.
  • The elastic nature of the adhesive allows for reuse, and its performance remains consistent over time.

Conclusions:

  • Engineered subsurface microstructures in elastic films offer a promising strategy for developing high-performance, reusable adhesives for diverse environmental conditions.
  • The mechanical basis of adhesion in these materials ensures robustness and longevity, overcoming limitations of conventional chemical adhesives.
  • This biomimetic approach provides a versatile adhesive solution for challenging applications, including underwater and biomedical settings.