Composite antibacterial material with strong photocatalytic activity, silver doped titanium dioxide nano powder

Ag-TiO2 is a high-performance composite nanomaterial that integrates the superior broad-spectrum antimicrobial properties of Nano Silver (Ag) with the powerful photocatalytic activity of Titanium Dioxide (TiO2).

As a flagship product of SAT NANO, this hybrid material overcomes the limitations of single-component agents, providing a comprehensive, 24/7 protection layer against bacteria, viruses, and molds.

1. The Synergistic Effect (Why Dope Ag into TiO2?)

1. 24/7 Performance: While standard TiO2 requires light to function, and pure Silver can be costly or prone to oxidation, the Ag-TiO2 composite works under all conditions。

2. Enhanced Efficiency: Silver nanoparticles act as  "electron traps" on the TiO2 surface, preventing the recombination of photo-generated electrons and holes. This increases the photocatalytic efficiency by 3 to 5 times compared to pure TiO2, even under visible light.

3. Anti-Discoloration: Traditional silver-based agents often cause yellowing or darkening. SAT NANO’s advanced doping technology stabilizes silver within the TiO2 crystal lattice, preserving the original color of the substrate.

2. Dual Killing Mechanism

1. Photocatalytic Action (Light Mode): Under UV or visible light, TiO2 generates Reactive Oxygen Species (ROS) such as hydroxyl radicals (⋅OH) and superoxide anions (⋅O2−). These highly reactive species oxidize and decompose the cell walls and internal components of microbes into H2O and CO2.

2. Contact Inhibition (Dark/Constant Mode): Silver ions (Ag+) are continuously released at a controlled rate. These ions penetrate the bacterial cell membranes, bind to essential metabolic enzymes, and disrupt DNA replication, leading to immediate death or loss of reproductive ability.

3. Major Applications

Medical & Healthcare: Surgical coatings, medical catheters, face mask filters, and hospital furniture.

Home Appliances: Air conditioner filters, refrigerator liners, washing machine seals, and air purifiers.

Building Materials: Antibacterial paints, self-cleaning glass, ceramic glazes, and anti-mold grouts.

Textiles: Antimicrobial fibers for sportswear, socks, and hospital bedding (highly wash-resistant).

Water Treatment: Purification of industrial wastewater by removing bacterial contaminants and organic dyes.

4. Technical Specifications (Typical Data)

Item	Typical Value
Appearance	White or Light Grey Powder
Average Particle Size	10-30nm
Crystal Phase	Anatase or Rutile
Silver (Ag) Content	0.5% - 5% (Customizable)
Specific Surface Area (BET)	50 - 80 m2/gm2/g
pH Value	6.0 - 8.0

Here is a professional summary of the application performance parameters and experimental data for the Silver-doped Titanium Dioxide (Ag-TiO2) antibacterial agent.

Performance Parameters of Ag-TiO2 Antibacterial Agent

The efficacy of Ag-TiO2is typically measured across five dimensions: Microbiological Spectrum, Antimicrobial Kinetics (Speed), Minimum Inhibitory Concentration (MIC), Stability, and Safety.

The following are typical application effect parameters and reference experimental data of SAT NANO product:

1. Core Microbiological Efficacy

Based on international standards such as JIS Z 2801 or ISO 22196, Ag-TiO2 demonstrates exceptional performance:

Tested Pathogen	Kill Rate (24h)	R-Value (Antimicrobial Activity)	Evaluation
E. coli (Gram negative)	> 99.99%	> 4.0	Excellent
S. aureus (Gram positive)	> 99.9%	> 3.5	Good
C. albicans (Fungi/Yeast)	> 99%	> 2.0
K. pneumoniae	> 99.9%	> 3.0

Note: R-value = log(Control CFU) - log(Treated CFU). R > 2.0 indicates an effective antibacterial surface.

2. Antimicrobial Kinetics (Kill Speed)

The synergistic effect of Ag and TiO2 results in rapid disinfection:

Under Light (1000 lux): Achieves a 90% kill rate against E. coli within 1 hour, reaching 99.9% within 2-4 hours due to photocatalytic ROS generation.

In Dark Conditions: Relies on Ag+Ag+ release, achieving a >99% kill rate within 6-12 hours.

3. Minimum Inhibitory Concentration (MIC)

The MIC represents the lowest concentration (in ppm or mg/L) required to completely inhibit visible bacterial growth:

Microorganism	Typical MIC Range
E. coli	100 - 250 ppm
S. aureus	150 - 300 ppm
B. subtilis	200 - 400 ppm
A. niger (Mold/Fungi)	500 - 800 ppm

Application Note: While the MIC is low, the recommended dosage in final products (e.g., plastics or paints) is usually 0.5% - 2.0% (5,000-20,000 ppm) to ensure long-term durability and high intensity in harsh environments.

SAT NANO's Ag-TiO2TiO2 Antibacterial Agent is a next-generation solution for industries requiring high hygiene standards. It doesn't just "kill" bacteria; it establishes a sustainable, self-sanitizing surface.