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Author Spotlight: Exploring the Antibacterial Effects of Zinc Oxide Nanoparticles in Overcoming Antibiotic Resistance
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Water-Based Scalable Methods for Self-Cleaning Antibacterial ZnO-Nanostructured Surfaces
Athanasios Milionis1, Abinash Tripathy1, Matteo Donati1
1Laboratory of Thermodynamics in Emerging Technologies, Department of Mechanical and Process Engineering, ETH Zürich, 8092 Zürich, Switzerland.
Industrial & Engineering Chemistry Research
|August 25, 2020
Summary
Researchers developed a novel method to create ZnO nanostructures for controlling bacterial colonization. These surfaces offer potent bactericidal action or strong bacterial repulsion, ensuring safer water and biomedical applications.
Area of Science:
- Materials Science
- Nanotechnology
- Environmental Science
Background:
- Bacterial colonization on surfaces presents significant health risks, impacting biomedical applications and water safety.
- Existing strategies for bacterial control include bactericidal surfaces and low-adhesion surfaces.
- There is a need for scalable, environmentally friendly methods to create customized surfaces for bacterial inhibition.
Purpose of the Study:
- To develop a facile, scalable, and eco-friendly strategy for creating customized surfaces to combat bacterial colonization.
- To engineer surfaces with bactericidal properties and/or bacterial repellency.
- To evaluate the effectiveness of these surfaces in water disinfection and preventing bacterial adhesion.
Main Methods:
- Fabrication of zinc oxide (ZnO) nanostructures via immersion of zinc in hot water.
- Hydrophobization of ZnO nanostructures using water-based or fluorine-free sprays.
- Assessment of bactericidal activity through direct contact and remote reactive oxygen species (ROS) action.
- Evaluation of bacterial adhesion and repulsion properties.
- Measurement of Zn2+ ion release in aqueous media.
Main Results:
- The fabricated ZnO nanostructures demonstrated extreme bactericidal effectiveness (9250 cells cm-2 h-1).
- Remote bactericidal action was achieved in the dark, leading to >99.98% water disinfection within 3 hours.
- Hydrophobized nanostructures exhibited strong bacterial repulsion, significantly reducing adhesion.
- Released Zn2+ ion concentration (0.73 ± 0.15 ppm) remained well below safe drinking water limits.
Conclusions:
- The developed ZnO nanostructures offer a versatile and effective solution for controlling bacterial colonization.
- The method provides customized surfaces for either eliminating bacteria or preventing their adhesion.
- These environmentally benign and scalable approaches pave the way for enhanced water disinfection and biomedical surface safety.
