I-GLAD: a new strategy for fabricating antibacterial surfaces

Area of Science:

• Materials Science
• Nanotechnology
• Biomaterials Engineering

Background:

• Naturally occurring antibacterial surfaces leverage physical mechanisms to combat bacteria, offering an alternative to chemical antibiotics.
• Bacterial resistance to traditional antibiotics is a growing global health concern.
• Mimicking natural hierarchical micro-nano structures for large-scale antibacterial applications presents significant fabrication challenges.

Purpose of the Study:

• To introduce and validate inverted glancing angle deposition (I-GLAD) as a scalable nanofabrication technique for bio-inspired antibacterial surfaces.
• To investigate the physical bactericidal mechanisms of I-GLAD fabricated nanostructures.
• To address knowledge gaps in seeding techniques and process control for GLAD to optimize nano-protrusion morphology.

Main Methods:

• Utilized inverted glancing angle deposition (I-GLAD), a novel bottom-up nanofabrication technique.
• Fabricated nano-structured surfaces with controlled morphologies.
• Evaluated antibacterial efficacy against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) using bacterial growth assays and Scanning Electron Microscopy (SEM).

Main Results:

• I-GLAD successfully fabricated nanoneedles with small tips and a flexible D/P ratio, crucial for the bactericidal mechanism.
• Antibacterial properties were validated through flat growth curves for both E. coli and S. aureus.
• SEM confirmed the physical bactericidal mechanism and the effectiveness of the nanostructure.

Conclusions:

• I-GLAD is an effective and scalable method for creating physical antibacterial surfaces.
• These surfaces demonstrate efficacy against both gram-negative (E. coli) and gram-positive (S. aureus) bacteria.
• I-GLAD surfaces hold significant potential for applications in healthcare settings and everyday consumer products to reduce microbial contamination.