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Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process
Published on: March 21, 2014
Switchable pH-responsive polymeric membranes prepared via block copolymer micelle assembly.
Suzana P Nunes1, Ali Reza Behzad, Bobby Hooghan
1Imaging and Characterization Lab, King Abdullah University of Science and Technology (KAUST), 23955-6900 Thuwal, Saudi Arabia.
ACS Nano
|April 21, 2011
Summary
Researchers developed highly dense, pH-responsive polymer nanochannels using self-assembly and phase separation. These asymmetric nanochannels exhibit a strong, reversible pH-triggered flux change, ideal for advanced filtration applications.
Area of Science:
- Materials Science
- Nanotechnology
- Polymer Chemistry
Background:
- Developing responsive materials is crucial for advanced separation technologies.
- Existing synthetic nanochannels often lack sufficient pH sensitivity or scalability.
- High-density, tunable nanopores are desirable for precise molecular control.
Purpose of the Study:
- To manufacture monodisperse asymmetric pH-responsive nanochannels with high pore density.
- To achieve reproducible fabrication of these nanochannels on a large scale (m²).
- To demonstrate strong, reversible pH-triggered flux modulation.
Main Methods:
- Self-assembly of metal-block copolymer complexes.
- Nonsolvent-induced phase separation for pore formation.
- Atomic Force Microscopy (AFM) for film morphology analysis.
- Transmission Electron Microscopy (TEM) tomography for micelle distribution.
- Cryo-field Emission Scanning Electron Microscopy (Cryo-FESEM), Small-Angle X-ray Scattering (SAXS), and ultra/nanofiltration for characterization.
Main Results:
- Fabrication of monodisperse asymmetric nanochannels with sub-10 nm diameters and ~400 nm lengths.
- Achieved very high pore densities (>2 × 10¹⁴ pores/m²) reproducible over m² scales.
- Demonstrated the strongest reported pH response in synthetic nm-range pores (over 2 orders of magnitude flux increase from pH 2 to 8).
Conclusions:
- The developed process enables scalable manufacturing of highly responsive polymer nanochannels.
- These nanochannels offer significant potential for advanced separation and sensing applications.
- The tunable pore properties and strong pH sensitivity represent a breakthrough in synthetic nanoporous materials.
