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Composite Microposts with High Dry Adhesion Strength.

H K Minsky1, Kevin T Turner1

  • 1Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania , Philadelphia 19104, United States.

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|April 26, 2017
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Summary

Researchers developed tunable adhesive posts with a stiff core and compliant shell. These composite posts significantly enhance adhesion under normal load and reduce it with shear, enabling precise microtransfer printing applications.

Keywords:
compositesdry adhesionmicroscaletransfer printingtunable adhesion

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Surface Science

Background:

  • Tunable adhesion is crucial for advanced manufacturing and robotics.
  • Existing adhesion methods often lack precise control over attachment and detachment.
  • Composite structures offer potential for novel adhesive properties.

Purpose of the Study:

  • To develop and characterize composite posts with enhanced and tunable adhesion.
  • To investigate the mechanics of adhesion and detachment in these structures.
  • To demonstrate the utility of these composite posts in microtransfer printing.

Main Methods:

  • Fabrication of composite posts with stiff cores and compliant shells.
  • Experimental measurement of adhesion strength under normal and shear loading.
  • Finite element analysis (FEA) to model adhesion mechanics.
  • Application of composite posts as stamps in microtransfer printing.

Main Results:

  • Composite posts exhibit a 9-fold increase in adhesion strength under normal loading compared to homogeneous posts.
  • Adhesion strength can be reduced by a factor of 7 through shear loading, demonstrating tunability.
  • Demonstrated successful microtransfer printing of 5 μm silicon membranes using the composite posts.

Conclusions:

  • Composite post structures provide a viable mechanism for achieving enhanced and tunable adhesion.
  • The core-shell design allows for independent control of adhesion under different loading conditions.
  • These tunable adhesives are promising for applications in microfabrication and robotics.