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Adhesion01:14

Adhesion

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Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow...
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Using Adhesive Patterning to Construct 3D Paper Microfluidic Devices
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A Novel Bioinspired Switchable Adhesive with Three Distinct Adhesive States.

Paula Yagüe Isla1, Elmar Kroner2

  • 1INM - Leibniz Institute for New Materials Campus D2 2, 66123, Saarbrücken, Germany E-mail: elmar.kroner@inm-gmbh.de ; Saarland University Campus D2 2, 66123, Saarbrücken, Germany.

Advanced Functional Materials
|September 15, 2015
PubMed
Summary

This study introduces a novel gecko-inspired switchable adhesive with two distinct pillar heights. This design enables tunable adhesion, offering controllable low and high pull-off forces for versatile applications.

Keywords:
bioinspired adhesivespatternedpull-offresponsiveswitchable

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Area of Science:

  • Materials Science
  • Biomimetics
  • Surface Engineering

Background:

  • Gecko feet exhibit remarkable dry adhesion through hierarchical fibrillar structures.
  • Developing synthetic materials that mimic gecko adhesion is crucial for advanced attachment technologies.
  • Controlling adhesion strength dynamically remains a significant challenge in synthetic dry adhesives.

Purpose of the Study:

  • To introduce a novel switchable adhesive inspired by gecko's fibrillar dry attachment system.
  • To demonstrate a two-step control mechanism for adhesion force based on preload.
  • To develop a new fabrication method for creating multi-height pillar structures.

Main Methods:

  • Fabrication of a patterned surface with mushroom-shaped pillars of two distinct heights using a novel 'double inking' method.
  • Analysis of adhesion performance under varying preload conditions.
  • Investigation of pillar deformation behavior using in situ monitoring.

Main Results:

  • The adhesive exhibits two distinct levels of pull-off force controlled by low and high preload.
  • Low preload engages only taller pillars for lower adhesion; higher preload engages all pillars for stronger adhesion.
  • Excessive loading induces buckling, leading to a significant decrease in pull-off force, demonstrating switchable adhesion.

Conclusions:

  • The developed gecko-inspired adhesive offers tunable adhesion with a two-step switching mechanism.
  • The 'double inking' fabrication method successfully creates the required multi-height pillar structures.
  • This technology has potential applications in areas requiring switchable and controllable dry adhesion.