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Toward fabric-based flexible microfluidic devices: pointed surface modification for pH sensitive liquid transport.

Fehime Vatansever1, Ruslan Burtovyy, Bogdan Zdyrko

  • 1Department of Materials Science and Engineering, Clemson University, 161 Sirrine Hall, Clemson, South Carolina 29634, USA.

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Summary

Researchers developed switchable microfluidic fiber channels in textiles using pH-sensitive polymers. This innovation enables controllable liquid transport for smart fabrics and analytical applications.

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Area of Science:

  • Materials Science
  • Textile Engineering
  • Microfluidics

Background:

  • Microfluidic devices traditionally use rigid materials, limiting applications in flexible electronics and wearable technology.
  • Controlling fluid transport in microchannels often requires external pumps or complex valve systems.
  • Developing smart textiles with integrated fluidic capabilities remains a significant challenge.

Purpose of the Study:

  • To fabricate microfluidic fiber channels with switchable water transport capabilities within flexible textile materials.
  • To develop a robust and scalable method for yarn-selective surface modification for creating functional textile-based microfluidics.
  • To demonstrate pH-controlled liquid redirection within these textile microfluidic channels.

Main Methods:

  • Utilized a preprogrammed yarn-based fabric made of PET/PP materials.
  • Employed yarn-selective surface modification involving grafting epoxide-containing polymers and pH-sensitive polymers (PAA, P2VP) onto PET yarns.
  • Engineered amphiphilic channels constrained by hydrophobic PP boundaries, with hydrophilic PEG ports for liquid delivery.

Main Results:

  • Successfully fabricated microfluidic fiber channels capable of switchable water transport in flexible textiles.
  • Demonstrated pH-dependent liquid transport, redirecting aqueous solutions towards PAA channels at pH > 4 and both PAA/P2VP channels at pH < 4.
  • The developed system exhibits robust and scalable fabrication, enabling precise control over liquid flow direction.

Conclusions:

  • The developed textile-based microfluidic chip offers a novel platform for pH-selective liquid transport.
  • This technology holds significant potential for analytical applications, such as point-of-care diagnostics.
  • The integration of microfluidics into smart textiles opens new avenues for wearable technology and advanced functional fabrics.