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One-step formation of three-dimensional interconnected T-shaped microstructures inside composites by orthogonal

Zhiming Shen1, Hiroyuki Saito1, Wataru Mita1

  • 1Extreme Energy-Density Research Institute, Nagaoka University of Technology, Nagaoka, Niigata, Japan.

Science and Technology of Advanced Materials
|March 6, 2024
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A novel one-step dielectrophoresis method enables fillers to self-assemble in three dimensions within a polymer matrix, creating interconnected iron microstructures for enhanced composite films.

Keywords:
T-shaped structuredielectrophoresisfractal analysisself-assembly

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Achieving 3D percolation pathways in polymer composites requires fillers to self-assemble horizontally and vertically.
  • Conventional dielectrophoresis methods are limited to one-dimensional filler alignment.

Purpose of the Study:

  • To develop a one-step dielectrophoresis approach for inducing orthogonal bidirectional self-assembly of fillers.
  • To create 3D interconnected T-shaped iron microstructures (3D-T CIP) within a polymer matrix.

Main Methods:

  • Utilized a one-step dielectrophoresis technique with an AC electric field and a non-contact method.
  • Employed in situ optical microscopy for real-time observation of 3D-T CIP formation.
  • Applied statistical and fractal analysis for characterization, supported by finite element simulations.

Main Results:

  • Successfully induced fillers to self-assemble along two orthogonal axes, forming 3D-T CIP.
  • Achieved a linear structure along the thickness and a network structure on the surface.
  • Identified an insulating polyethylene terephthalate (PET) film as crucial for 3D-T CIP formation.

Conclusions:

  • The developed method offers a superior alternative to traditional two-step fabrication processes.
  • The resulting 3D electrically conductive pathways in 3D-T CIP films are suitable for magnetic field sensor applications.