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Self-Folded Gripper-Like Architectures from Stimuli-Responsive Bilayers.

Arif M Abdullah1, Xiuling Li2, Paul V Braun3

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Advanced Materials (Deerfield Beach, Fla.)
|June 20, 2018
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Summary

Researchers developed hinge-free self-folding microgrippers from simple bilayers. This innovation simplifies fabrication and actuation for smart structures used in medicine and micro/nanomanipulation.

Keywords:
bifurcationfunctional grippersself-foldingsoft roboticsstimuli-responsive

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Robotics

Background:

  • Self-folding microgrippers are smart structures crucial for medicine and micro/nanomanipulation.
  • Current microgrippers often require complex, multi-layered designs with patterned hinges, increasing fabrication costs and actuation complexity.
  • There is a need for simpler, more cost-effective methods to create functional microgrippers.

Purpose of the Study:

  • To demonstrate the feasibility of creating gripper-like configurations from simple planar bilayers without hinges.
  • To explore stimuli-responsive shape transformation in bilayers for on-demand actuation.
  • To provide a simplified fabrication route for functional microgrippers.

Main Methods:

  • Utilized finite element modeling to analyze the mechanics of stimuli-responsive shape transformation in bilayers.
  • Experimentally validated model predictions using millimeter-scale poly(dimethylsiloxane) (PDMS) bilayers.
  • Achieved axisymmetric gripper-like shapes through differential swelling in organic solvents.

Main Results:

  • Successfully demonstrated that simple planar bilayers can form functional gripper-like shapes without hinges.
  • Validated computational models with experimental results, showing predictable shape transformations.
  • Realized millimeter-scale PDMS microgrippers capable of differential swelling actuation.

Conclusions:

  • Developed a novel, hinge-free approach for fabricating self-folding microgrippers from bilayers.
  • The computational method is independent of length scales and material properties, offering broad applicability.
  • This work simplifies microgripper fabrication and contributes to the broader field of self-assembly.