High-Internal-Phase Emulsion Tailoring Polymer Amphiphilicity towards an Efficient NIR-Sensitive Bacteria Filter.

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• High internal phase emulsions (HIPEs) are crucial templates for macroporous materials.
• Designing effective molecular surfactants with specific amphiphilicity is key for HIPE preparation.
• Existing commercial surfactants often require high concentrations for HIPE formation.

Purpose of the Study:

• To tailor the amphiphilicity of polystyrene-b-polyvinylpyridine (PS-b-P4VP) for efficient HIPE formation.
• To develop a low-concentration surfactant system for HIPE templating.
• To fabricate functional macroporous materials from HIPEs and explore their applications.

Main Methods:

• Amphiphilicity tailoring of a PS-b-P4VP block co-polymer using trifluoroacetic acid.
• Preparation of high internal phase emulsions (HIPEs) using the modified polymer system at low concentrations (<5 wt%).
• Fabrication of macroporous triacrylate-based monoliths using HIPEs as templates.
• Coating the macroporous material with polypyrrole nanoparticles for enhanced functionality.

Main Results:

• Successful tailoring of PS-b-P4VP amphiphilicity enabled HIPE formation with less than 5 wt% of the polymer-CF3COOH system.
• The developed surfactant system is more efficient than typical commercial surfactants.
• Well-defined closed- and open-cell macroporous monoliths were fabricated by adjusting the water/oil phase ratio.
• The resulting macroporous material, coated with polypyrrole nanoparticles, demonstrated NIR-sensitive bacteria filtration and sterilization capabilities.

Conclusions:

• A novel, low-concentration surfactant system based on modified PS-b-P4VP was developed for HIPE preparation.
• The HIPEs effectively served as templates for creating macroporous triacrylate monoliths.
• The functionalized macroporous material shows promise as an NIR-sensitive antibacterial filter, capable of excluding and killing bacteria.