Recyclable magnetite-silver heterodimer nanocomposites with durable antibacterial performance

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Developing durable and recyclable antimicrobial agents is crucial.
• Magnetite-silver nanocomposites offer potential due to combined properties.

Purpose of the Study:

• To fabricate and characterize magnetic iron oxide nanoparticles coated with chitosan/polyacrylic acid and silver nanoparticles (Fe3O4@ECS/PAA-Ag NPs).
• To evaluate the antibacterial efficacy and recyclability of the synthesized nanocomposites.

Main Methods:

• Fabrication of magnetic iron oxide nanoparticles (Fe3O4 NPs) coated with ethylenediamine-modified chitosan/polyacrylic acid (Fe3O4@ECS/PAA).
• Direct deposition of silver (Ag) nanoparticles to form antibacterial heterodimers (Fe3O4@ECS/PAA-Ag NPs).
• Characterization using FT-IR, XRD, TEM, and TGA; antibacterial testing against E. coli and S. aureus.

Main Results:

• The Fe3O4@ECS/PAA-Ag NPs were successfully synthesized with an approximate heterodimer length of 45 nm.
• The nanocomposites exhibited good colloidal stability and magnetic recoverability.
• Fe3O4@ECS/PAA-Ag NPs retained nearly 100% biocidal efficiency against E. coli and S. aureus for ten cycles without washing.

Conclusions:

• The synthesized Fe3O4@ECS/PAA-Ag NPs possess potent and durable antibacterial properties.
• The magnetic nature facilitates easy recovery and reuse, highlighting their potential for recyclable antimicrobial applications.
• These nanocomposites represent a promising solution for applications requiring long-lasting antimicrobial activity.