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Electrically active hydrogels based on PEDOT:PSS for neural cultures.

Liwen Wang1, Yannick Hajee2, Jean-Philippe Frimat3

  • 1Department of Microelectronics, Faculty of Electrical Engineering, Computer Science and Mathematics, Delft University of Technology Delft the Netherlands a.savva@tudelft.nl.

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New electrically active hydrogels blend alginate, laminin, and conductive PEDOT:PSS particles for neural interfacing. These stable, transparent hydrogels support neural cell growth and offer promising bioelectronic applications.

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Area of Science:

  • Biomaterials Science
  • Neuroscience
  • Polymer Chemistry

Background:

  • Electrically active hydrogels are crucial for biohybrid interfaces with biological tissues.
  • Developing materials that combine electrical activity with biocompatibility for neural applications is essential.

Purpose of the Study:

  • To engineer electrically active hydrogels for in vitro neural cell cultures.
  • To create a soft, bioelectronic interface for neural engineering.

Main Methods:

  • Fabrication of composite hydrogels using alginate, laminin, and poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) particles.
  • Characterization using oscillatory rheology, optical transmission measurements, electrochemical impedance spectroscopy, and cyclic voltammetry.
  • In vitro culture of human induced pluripotent stem cell-derived cortical neurons.

Main Results:

  • The hydrogels demonstrated viscoelastic properties (1-10 kPa moduli) suitable for neural tissue interfacing.
  • High optical transparency (>45% at 500 nm) was achieved, enhanced by reducing thickness.
  • PEDOT:PSS incorporation significantly improved conductivity and charge storage capacitance.
  • Stable electrochemical performance over 80 cycles and structural/functional stability in cell culture for over four weeks.
  • Successful long-term (28 days) culture of human cortical neurons, demonstrating cytocompatibility.

Conclusions:

  • Alginate-laminin-PEDOT:PSS hydrogels offer a stable, conductive, and biocompatible platform for neural applications.
  • These hydrogels show significant potential as soft bioelectronic interfaces for neural engineering.
  • The developed material supports neural cell growth and function in vitro.