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Surface tension-driven self-folding polyhedra.

Timothy G Leong1, Paul A Lester, Travis L Koh

  • 1Department of Chemical and Biomolecular Engineering and Department of Chemistry, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 5, 2007
PubMed
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Surface tension drives self-folding of patterned polyhedra using liquefied solder hinges. This controlled process works for various materials and scales, from millimeters to nanometers.

Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Physics

Background:

  • Self-folding structures offer novel fabrication methods.
  • Surface tension is a key physical phenomenon in micro/nanoscale systems.

Purpose of the Study:

  • To investigate surface tension-driven self-folding of patterned polyhedra.
  • To explore the control, fault tolerance, and scalability of this folding method.

Main Methods:

  • Finite element simulations of the folding process.
  • Experimental fabrication and folding of patterned polyhedra with solder hinges.

Main Results:

  • Liquefied solder hinges minimize interfacial free energy, creating torque for folding.
  • Simulations show precise control, fault tolerance, and scalability across material types and sizes (mm to nm).

Related Experiment Videos

  • Experiments successfully folded metallic polyhedra from 2 mm down to 15 micrometers.

    • Conclusions:

    • Surface tension-driven self-folding is a viable method for fabricating polyhedra.
    • The technique demonstrates precise control and scalability for micro/nanoscale applications.