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Hierarchically structured composites for ultrafast liquid sensing and smart leak-plugging.

Xiaodong Wu1, Yangyang Han, Xinxing Zhang

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Researchers developed hierarchical conductive polymer composites (CPCs) for ultrafast liquid sensing. These novel CPC materials offer rapid response and regeneration, enabling applications in sensors and leak-plugging materials.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Conductive polymer composites (CPCs) are used for liquid sensing, but bulk materials suffer from slow response times due to limited liquid permeation.
  • Existing CPC-based liquid sensors exhibit sluggish responses, hindering real-time applications.

Purpose of the Study:

  • To develop a new class of liquid sensing materials with ultrafast response and regeneration capabilities.
  • To overcome the limitations of bulk CPCs in liquid sensing applications through hierarchical structure design.

Main Methods:

  • Fabrication of CPC@PU composites by coating a thin CPC layer with a segregated conductive network onto porous polyurethane (PU) skeletons using layer-by-layer assembly.
  • Hierarchical structure design to enhance liquid permeation and conductivity changes.

Main Results:

  • The hierarchical CPC@PU composites demonstrated ultrafast response times (0.05-0.15 s) to solvent stimuli, approximately 1000 times faster than existing materials.
  • Quick regeneration (within 10 s) was achieved using hot-air after liquid sensing.
  • Fabrication of organic liquid/gas sensors, liquid-sensing electronic skins, and smart leak-plugging materials.

Conclusions:

  • The proposed hierarchical structure design significantly enhances the performance of CPC-based liquid sensing materials.
  • These materials offer potential for real-time liquid sensing, environmental monitoring, and leak-plugging applications in various industries.