Bactericidal Efficacy of Nanostructured Surfaces Increases under Flow Conditions

Area of Science:

• Materials Science
• Biotechnology
• Surface Engineering

Background:

• Bacterial colonization on surfaces causes significant economic losses and health risks.
• Antibiotic and antiseptic resistance necessitates non-chemical antibacterial strategies.
• Nanostructured surfaces show potential for combating bacterial adhesion.

Purpose of the Study:

• To investigate bacterial attachment and viability on nanostructured surfaces under fluid flow.
• To evaluate the impact of varying fluid flow rates on bacterial adhesion and survival.
• To assess the bactericidal efficacy of nanostructured surfaces under dynamic conditions.

Main Methods:

• Fabrication of a model nanostructured surface on Ti-6Al-4V using hydrothermal synthesis.
• Utilizing a microfluidic device to study bacterial adhesion under controlled fluid flow.
• Experimentally investigating a range of flow rates and fluid wall shear stresses.

Main Results:

• Fluid flow significantly reduced bacterial adhesion and viability on nanostructured surfaces.
• Bactericidal efficacy against Pseudomonas aeruginosa and Staphylococcus aureus increased under flow conditions compared to static conditions.
• Bactericidal efficacy was independent of fluid wall shear stress, though dead-cell count trends varied between species.

Conclusions:

• Nanostructured surfaces exhibit enhanced antibacterial properties under fluid flow.
• Fluid flow is a critical factor in optimizing the performance of antibacterial surfaces.
• Findings support the development of nanostructured surfaces for biomedical and industrial applications to prevent bacterial colonization.