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Assessing Disaster Resilience of Concrete with Titanium Dioxide Nanoparticles
Published on: November 14, 2025
248
Titanium dioxide modified with silver by two methods for bactericidal applications
G Durango-Giraldo1, A Cardona1, Juan Felipe Zapata1
1Materiales Avanzados y Energía - MATyER Research Group, Facultad de Ingeniería, Instituto Tecnológico Metropolitano-ITM, Medellín, Colombia.
Heliyon
|June 14, 2019
Summary
Silver-modified titanium dioxide (TiO2) nanoparticles show enhanced antibacterial properties. The Ex situ method for silver incorporation resulted in superior bactericidal activity against E. coli and S. aureus compared to in situ methods.
Area of Science:
- Materials Science
- Nanotechnology
- Antimicrobial Research
Background:
- Titanium dioxide (TiO2) is a semiconductor with photocatalytic antibacterial properties under UV light.
- Silver (Ag) possesses potent antimicrobial activity against diverse microorganisms.
- Combining TiO2 with Ag enhances photocatalytic efficiency and antibacterial efficacy.
Purpose of the Study:
- To synthesize and characterize silver-modified TiO2 nanoparticles.
- To evaluate the antibacterial activity of TiO2 nanoparticles modified by Ex situ and In situ methods.
- To compare the efficacy of different silver incorporation methods against E. coli and S. aureus.
Main Methods:
- Hydrothermal synthesis of TiO2 nanoparticles.
- Silver modification via wet impregnation (Ex situ) and in situ incorporation.
- Characterization using EDS and XPS; antimicrobial testing against E. coli and S. aureus.
Main Results:
- Synthesized TiO2 nanoparticles exhibited anatase phase and spherical morphology (approx. 10.6 nm).
- Silver presence confirmed in modified nanoparticles.
- Ex situ silver-modified TiO2 showed significantly higher bactericidal activity than in situ modified and unmodified TiO2.
Conclusions:
- Both Ex situ and in situ methods effectively yield bactericidal silver-modified TiO2 nanoparticles.
- The Ex situ method demonstrated superior antibacterial performance.
- Silver-modified TiO2 nanoparticles are promising for antimicrobial applications.
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