Related Experiment Video
Updated: Jun 25, 2026
05:32
Using Vertically Aligned Carbon Nanofiber Arrays on Rigid or Flexible Substrates for Delivery of Biomolecules and Dyes to Plants
Published on: July 21, 2023
Actuatable membranes based on polypyrrole-coated vertically aligned carbon nanofibers
Benjamin L Fletcher1, Scott T Retterer, Timothy E McKnight
1Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
ACS Nano
|February 12, 2009
Summary
Researchers developed nanoporous membranes using carbon nanofibers coated with polypyrrole. Electrochemical stimulation dynamically controls pore size, enabling selective molecular transport and gating for advanced separation applications.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Nanoporous membranes offer high-efficiency molecular separation across diverse research fields.
- Controlling membrane selectivity with external stimuli and integrating them into multiscale systems are key research interests.
- Vertically aligned carbon nanofibers (VACNFs) provide a tunable platform for nanoscale control of membrane properties.
Purpose of the Study:
- To demonstrate the dynamic physical modulation of membrane permeability in VACNF membranes.
- To investigate the use of an electrically actuatable polymer, polypyrrole, for controlling VACNF membrane pore size.
- To enable selective transport and gating of nanoscale pores through dynamic pore size adjustment.
Main Methods:
- Fabrication of VACNF membranes with defined interfiber spacing for nanoscale pore structure control.
- Coating VACNF structures with an electrically responsive polymer, polypyrrole.
- Utilizing electrochemical reduction of polypyrrole to induce controlled swelling of the VACNF diameter.
Main Results:
- Polypyrrole coating on VACNFs enabled dynamic physical modulation of membrane permeability.
- Electrochemical reduction of polypyrrole caused VACNF swelling, leading to a decrease in membrane pore size.
- Demonstrated controlled gating of nanoscale pores through dynamic pore size adjustment.
Conclusions:
- VACNF membranes functionalized with polypyrrole offer a method for dynamic, stimulus-responsive control over molecular transport.
- Electrically actuatable polymers provide a viable strategy for tuning membrane selectivity and permeability.
- This approach facilitates the development of advanced nanoporous membranes for selective separation and controlled transport applications.
