Bioinspired Dual Stimuli-Responsive Membranous System with Multiple On-Off Gates

Area of Science:

• Materials Science
• Polymer Chemistry
• Biomimetic Engineering

Background:

• Stimuli-responsive polymers are crucial for controlled biomolecule release.
• Current systems often lack independent control over multiple stimuli (e.g., temperature, pH, light).
• Mimicking biological systems requires membranes with independently controllable gates.

Purpose of the Study:

• To develop a stimuli-responsive membrane with independently controllable dual gates.
• To achieve precise, on-demand control over biomolecule transport.
• To create a platform for artificial cell membrane applications.

Main Methods:

• Grafting thermoresponsive poly(N-isopropylacrylamide) and pH-responsive poly(acrylic acid) onto anodized aluminum oxide membrane walls.
• Utilizing surface-initiated atom transfer radical polymerization for precise grafting.
• Employing orthogonal stimuli (temperature and pH, light irradiation) for independent gate control.

Main Results:

• Demonstrated two independent on-off gates responsive to temperature and pH.
• Showcased prompt and independent control of temperature and pH via specific light wavelengths.
• Successfully controlled the transport of fluorescein isothiocyanate-labeled bovine serum albumin (FITC-BSA) through the membrane gates.

Conclusions:

• The developed membrane exhibits independent dual stimuli-responsive gating.
• This strategy offers potential for creating advanced artificial cell membranes.
• Highlights the significance of independently modified layered membranes for controlled transport applications.