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Free-standing hydrogel-particle composite membrane with dynamically controlled permeability.

Khulan Sergelen1, Christian Petri2, Ulrich Jonas2

  • 1BioSensor Technologies, AIT-Austrian Institute of Technology GmbH, Muthgasse 11, 1190 Vienna, Austria and Center for Biomimetic Sensor Science, Nanyang Technological University, 50 Nanyang Avenue, 637553 Singapore.

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A novel thermoresponsive composite membrane, combining poly(N-isopropylacrylamide) and polystyrene nanoparticles, offers tunable permeability for biosensing applications. This temperature-controlled filter effectively blocks and allows diffusion of molecules, showing promise for continuous monitoring systems.

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Chemical Engineering

Background:

  • Developing advanced membranes with tunable properties is crucial for next-generation biosensors.
  • Thermoresponsive polymers offer potential for dynamic control over membrane permeability.
  • Integrating nanoparticles can enhance mechanical stability and performance of polymer membranes.

Purpose of the Study:

  • To prepare and characterize a free-standing composite membrane from thermoresponsive poly(N-isopropylacrylamide) (pNIPAAm) and polystyrene nanoparticles (PS NP).
  • To investigate the temperature-controlled permeability and diffusion properties of the composite membrane for various molecules.
  • To evaluate the potential of this membrane for applications in continuous monitoring biosensors and microfluidic systems.

Main Methods:

  • Fabrication of micrometer-thick composite layers using light-induced crosslinking of pNIPAAm and mechanical reinforcement by PS NP.
  • Preparation of free-standing membranes spanning microfluidic channels using template stripping.
  • Analysis of diffusion, swelling ratio, permeability, and sorption using combined surface plasmon resonance (SPR) and optical waveguide spectroscopy (OWS).

Main Results:

  • Successful preparation of a defect-free, free-standing composite membrane with nanoscale pores over several square millimeters.
  • Demonstrated reversible switching of membrane permeability triggered by temperature changes, controlling diffusion of low molecular weight molecules.
  • Observed effective blocking of diffusion and low nonspecific sorption of proteins from blood serum.

Conclusions:

  • The developed thermoresponsive composite membrane functions as a tunable filter with nanoscale pores.
  • Its temperature-triggered switching capability and low protein sorption make it suitable for biosensing and microfluidic applications.
  • This platform holds promise for continuous monitoring biosensors and advanced cell-on-chip studies.