Dual mode antibacterial surfaces based on Prussian blue and silver nanoparticles

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Prussian Blue (PB) is a cost-effective, biocompatible, and photothermally active nanomaterial.
• Silver nanoparticles possess inherent antibacterial properties.
• Developing advanced coatings for medical devices is crucial for infection prevention.

Purpose of the Study:

• To create a versatile coating for medical devices and implants by functionalizing glass surfaces.
• To combine the photothermal properties of Prussian Blue with the antibacterial action of silver nanoparticles.
• To investigate the enhanced antibacterial efficacy of the composite coating.

Main Methods:

• Grafting self-assembled monolayers of Prussian Blue nanoparticles onto a glass surface.
• Protecting the Prussian Blue layer with silica.
• Decorating the surface with spherical silver nanoparticles.
• Characterizing the morphology and composition of the functionalized glass surfaces.
• Evaluating the antibacterial effect against Gram-positive and Gram-negative bacteria.

Main Results:

• Successfully created a functionalized glass surface with a layer-by-layer approach.
• Demonstrated intrinsic antibacterial activity from silver nanoparticles.
• Showcased enhanced antibacterial action upon activation of Prussian Blue's photothermal effect using near-infrared (NIR) radiation.
• Verified effectiveness against both Gram-positive and Gram-negative planktonic bacteria.

Conclusions:

• The developed coating integrates Prussian Blue and silver nanoparticles for enhanced, on-demand antibacterial activity.
• The combination offers a promising solution for infection control in medical devices and implants.
• Near-infrared radiation provides a safe and effective method to activate the photothermal antibacterial effect.