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Related Experiment Video

Updated: Jun 17, 2025

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Mechanically robust ultrathin nanofibrous films by using microfluidic-based continuous printing.

Xiao Chen1,2,3, Jiaqing Su2, Sha Cheng2

  • 1Hubei Longzhong Laboratory, Wuhan University of Technology Xiangyang Demonstration Zone, Xiangyang 441000, China. pczhang@whut.edu.cn.

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Summary

A new microfluidic printing method creates ultrathin nanofibrous films with significantly improved mechanical strength. This advanced fabrication technique enhances materials for flexible electronics and energy storage applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Science

Background:

  • Ultrathin nanofibrous films are crucial for flexible electronics, electronic skin, and batteries.
  • Conventional fabrication methods limit the mechanical properties of these films.
  • Structural shortcomings hinder the performance of existing nanofibrous films.

Purpose of the Study:

  • To develop a novel fabrication strategy for producing free-standing ultrathin nanofibrous films with enhanced mechanical properties.
  • To investigate the potential of a microfluidic-based continuous printing strategy for advanced material development.
  • To demonstrate the versatility of this method for various nanofibrous materials.

Main Methods:

  • Utilized a microfluidic-based continuous printing strategy for film fabrication.
  • Precisely controlled microfluidic flow at the micrometer scale.
  • Fabricated films from aramid nanofibres (ANF), regenerated cellulose nanofibres (RCNF), and cellulose diacetate (CDA).

Main Results:

  • Achieved ultrathin ANF films with thicknesses as low as 140 ± 25 nm.
  • Recorded impressive tensile strength for ANF films (667 ± 40 MPa), a 120% improvement over cast films.
  • Demonstrated significant strength increases for RCNF (42%) and CDA (94%) films compared to cast counterparts.
  • Observed enhanced mechanical robustness attributed to double-sided protonation and a symmetrically dense structure.

Conclusions:

  • The microfluidic-based continuous printing strategy offers a promising pathway for developing advanced ultrathin nanofibrous films.
  • This method overcomes limitations of conventional techniques, enabling superior mechanical properties.
  • The developed films are suitable for practical applications in flexible wearable devices, electronic skin, and rechargeable batteries.