Bioinspired N-Oxide-Based Zwitterionic Polymer Brushes for Robust Fouling-Resistant Surfaces

Area of Science:

• Materials Science
• Environmental Engineering
• Polymer Chemistry

Background:

• Surface fouling is a significant challenge in environmental applications, reducing the efficiency of filtration membranes.
• Superhydrophilic N-oxide-based osmolytes in marine organisms inspire novel antifouling strategies.
• Developing robust and effective fouling-resistant surfaces is crucial for sustainable water treatment and other environmental technologies.

Purpose of the Study:

• To develop and evaluate novel fouling-resistant surfaces using amine N-oxide polymer brushes.
• To investigate the impact of N-oxide modification on membrane surface properties and transport characteristics.
• To assess the antifouling performance and fouling reversibility of the modified membranes.

Main Methods:

• Surface-initiated atom transfer radical polymerization (SI-ATRP) was used to graft N-oxide monomers onto filtration membranes.
• Material characterization techniques confirmed the successful grafting and altered surface properties (hydrophilicity, charge, roughness).
• Transport properties (water permeability, water-salt selectivity) and antifouling performance (flux decline, fouling reversibility) were evaluated. Surface Plasmon Resonance (SPR) was used to study foulant-membrane interactions.

Main Results:

• Successful grafting of amine N-oxide brush layers was confirmed, leading to increased surface hydrophilicity, reduced charge, and decreased roughness.
• The modified membranes maintained excellent water permeability and water-salt selectivity, showing no compromise in transport properties.
• Antifouling tests revealed significantly improved performance: a 32.1% lower flux decline and 18.55% greater fouling reversibility compared to control membranes.

Conclusions:

• Amine N-oxide polymer brushes are a promising strategy for creating highly effective fouling-resistant surfaces.
• The modification enhances membrane performance by altering surface characteristics without negatively impacting essential transport properties.
• This approach holds significant potential for designing advanced materials for diverse environmental applications, particularly in water treatment.