Dual-responsive polyacrylonitrile-based electrospun membrane for controllable oil-water separation

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Smart materials with responsive wettability offer advanced solutions for controllable oil-water separation.
• Developing efficient membranes for separating oil-water mixtures and emulsions is crucial for environmental remediation and industrial processes.

Purpose of the Study:

• To synthesize and fabricate a novel smart composite membrane with stimuli-responsive wettability for tunable oil-water separation.
• To investigate the membrane's performance in separating various oil-water mixtures and emulsions.
• To design a logic gate system for advanced control of the separation process.

Main Methods:

• Synthesis of a responsive copolymer from N-isopropylacrylamide and 2-(dimethylamino) ethyl methacrylate.
• Fabrication of a smart composite membrane by electrospinning the copolymer with polyacrylonitrile.
• Evaluation of the membrane's wettability response to pH and temperature.
• Testing the membrane's separation efficiency for different oil-water mixtures and emulsions.
• Construction and testing of a logic AND gate system using temperature and pH stimuli.

Main Results:

• The developed composite membrane exhibited stimuli-responsive wettability to pH and temperature.
• The membrane demonstrated selective oil passage initially, with a switchable function to selective water passage upon exposure to acidic conditions or CO2.
• Heat treatment induced a structural change, enabling selective water passage.
• High separation efficiency was achieved for various oil-water mixtures and surfactant-stabilized emulsions.
• A logic AND gate was successfully constructed, enabling controlled water flow only when both temperature and acidity conditions were met.

Conclusions:

• The smart composite membrane offers a highly efficient and controllable method for oil-water separation.
• The stimuli-responsive nature and logic gate functionality present significant potential for remotely controlled separation processes.
• This technology holds promise for applications in environmental protection and industrial fluid management.