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ANTIBACTERIAL AGENTS
Introduction
Antibacterial agents used in ceramics are inorganic compounds designed to be incorporated into the glaze layer or ceramic body during high-temperature firing (1000°C – 1200°C).
Their primary function is to provide durable antibacterial and antifungal properties on the product surface (such as floor tiles, sanitary ware, and kitchenware) throughout the entire service life of the material.
1. Classification and Composition
The most common inorganic antibacterial compounds are metal-ion based, particularly silver-based systems:
|
Material |
Formula / Main Composition |
Mechanism of Action |
|
Silver Zeolite |
Silver ions (Ag⁺) immobilized within a zeolite (aluminosilicate) structure |
Ag⁺ ions are slowly released, attacking and disrupting bacterial cell membranes and inhibiting bacterial reproduction |
|
Nano Silver |
Silver particles at the nanoscale |
Strong antibacterial activity; however, special treatment is required to withstand high firing temperatures |
|
Titanium Dioxide (TiO₂) |
Titanium oxide (anatase phase) |
Acts as a photocatalyst, generating free radicals that destroy bacteria when exposed to UV light |
2. Technical Specifications
|
Parameter |
Characteristics |
|
Thermal Resistance |
Extremely high (Ag/Zeolite systems must be engineered to remain stable above 1000°C for glaze integration) |
|
Antibacterial Efficiency |
Broad-spectrum, high effectiveness (≥ 90% – 99.9%) |
|
Durability |
Long-lasting effectiveness throughout the product’s lifetime (24/7 performance) |
|
Safety |
Safe and non-toxic (certified for food contact and skin contact applications) |
3. Key Applications in Industry and Ceramics
Ceramic Tiles and Sanitary Ware
- Surface Antibacterial Protection: Silver ions integrated into the glaze or tile surface (e.g., floor tiles, kitchen areas, hospitals) to eliminate harmful bacteria such as E. coli and S. aureus, helping maintain a clean living environment.
- Medical Applications: Used in medical ceramics and kitchenware (ceramic/zirconia products) requiring high hygiene standards.
Water Filtration and Treatment Systems
- Antibacterial Ceramic Balls: Nano silver or silver zeolite is compressed into porous ceramic balls for use in household and industrial water filter cartridges, helping remove bacteria and heavy metals.
Construction Materials
- Self-cleaning Materials: TiO₂ coatings applied to tile and window surfaces create self-cleaning and air-purifying materials through photocatalytic reactions.
Consumer Products
- Antibacterial Ceramics: Applied in the manufacture of kitchen knives (zirconia knives) and cooking utensils.
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