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Multiscale Structures Aggregated by Imprinted Nanofibers for Functional Surfaces
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Sticking to rough surfaces using functionally graded bio-inspired microfibres.

Serdar Gorumlu1, Burak Aksak1

  • 1Department of Mechanical Engineering, Texas Tech University, Lubbock, TX 79409-1021, USA.

Royal Society Open Science
|July 7, 2017
PubMed
Summary
This summary is machine-generated.

Functionally graded fibrillar adhesives offer superior adhesion on rough surfaces compared to traditional monolithic designs. This innovation enhances the performance of synthetic gecko-inspired adhesives for diverse applications.

Keywords:
adhesionbioinspired adhesivesfunctionally graded microfibresgeckopull-offroughness

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Area of Science:

  • Materials Science
  • Biomimetics
  • Adhesion Science

Background:

  • Synthetic fibrillar adhesives mimic natural systems like gecko feet for strong adhesion.
  • Monolithic adhesives perform well on smooth surfaces but poorly on rough ones.

Purpose of the Study:

  • To investigate the adhesive performance of functionally graded microfibrillar adhesives on rough surfaces.
  • To compare the performance of functionally graded adhesives with monolithic designs.

Main Methods:

  • Fabrication of monolithic and functionally graded microfibre arrays from polyurethanes.
  • Quantification of adhesive performance using force-distance data from a custom adhesion measurement system.
  • Testing on surfaces with varying roughness (54 nm to 408 nm RMS roughness).

Main Results:

  • Monolithic arrays showed a significant drop in pull-off stress from 77 kPa (smooth) to 19 kPa (rough).
  • Functionally graded arrays maintained high pull-off stress: 81 kPa (smooth) and 63 kPa (rough).
  • Functionally graded adhesives demonstrated over threefold improvement on the roughest surface compared to monolithic ones.

Conclusions:

  • Functionally graded fibrillar adhesives exhibit consistent performance across surfaces of varying roughness.
  • These adhesives show significant potential as repeatable and reusable solutions for rough surface adhesion.
  • The divergent fiber end and soft distal layer design enhance adhesion on challenging surfaces.