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Permanent superhydrophilic surface modification in microporous polydimethylsiloxane sponge for multi-functional

Shrishty Bakshi1, Kritika Pandey2, Sudeep Bose3

  • 1Amity Institute of Nanotechnology, Amity University, Noida, UP, India.

Journal of Colloid and Interface Science
|May 19, 2019
PubMed
Summary

Researchers developed a permanent superhydrophilic Polydimethylsiloxane (PDMS) sponge using a sugar leaching method and polyacrylic acid (PAA) coating. This stable modification enhances PDMS for microfluidic and biomedical applications.

Keywords:
Polyacrylic acidPolydimethylsiloxane (PDMS)SuperhydrophilicSurface wettabilityUV grafting

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Environmental Science

Background:

  • Polydimethylsiloxane (PDMS) is widely used in microfluidics and biomedicine due to its unique properties.
  • The inherent hydrophobicity of PDMS limits its use with aqueous fluids and biomolecule adherence.
  • Existing surface modification techniques for PDMS often result in temporary hydrophilicity.

Purpose of the Study:

  • To develop a facile and permanent method for converting hydrophobic PDMS into a superhydrophilic state.
  • To enhance the surface wettability of PDMS for improved microfluidic and biomedical applications.
  • To explore the potential applications of the modified PDMS in microfluidic devices and bioremediation.

Main Methods:

  • PDMS sponges were fabricated using an eco-friendly sugar leaching technique.
  • The PDMS sponges were modified with an ultra-thin coating of polyacrylic acid (PAA).
  • The stability and superhydrophilic properties of the PDMS-PAA hybrid sponge were evaluated over time.

Main Results:

  • The PDMS-PAA hybrid sponge exhibited a permanent superhydrophilic state, stable for over 18 months.
  • The modified sponge demonstrated a high water absorption efficiency of 89%.
  • The superhydrophilic PDMS-PAA sponge was successfully applied as a portable pressure pump in microfluidics and as a bioactive matrix for microbial immobilization in effluent treatment.

Conclusions:

  • A novel, stable, and permanent superhydrophilic PDMS sponge was successfully developed.
  • The PDMS-PAA hybrid sponge offers significant advantages for microfluidic and biomedical applications requiring enhanced wettability.
  • The demonstrated applications highlight the potential of this material in advanced microfluidic systems and environmental remediation.