With the development of science and technology and the improvement of human living standards, people's demand for antibacterial materials and products will continue to increase. In order to improve human health, improve living and working environment, research and development of new, high-efficiency, non-toxic, odorless and antibacterial materials with long-lasting antibacterial properties have become the current research hotspot. Silver antibacterial materials have the characteristics of high efficiency, broad spectrum, low toxicity, tasteless, non-polluting environment, safety and environmental protection, etc., and are becoming one of the first choice antibacterial agents.

As a nanomaterial, nanosilver has volume effect, surface effect, quantum size effect and macroscopic quantum tunnel effect, and has great development potential and application value in the fields of superconductivity, photoelectricity, antibacterial, and catalysis.

Two types of bacteria, Escherichia coli and Staphylococcus aureus, were selected as representatives for the qualitative and quantitative detection of the antibacterial properties of the prepared nano-silver colloid. The experimental results confirmed that the nano silver colloid produced by Hongwu Nano has good antibacterial properties against Gram-negative bacteria, Gram-positive bacteria and molds. And the antibacterial properties are durable.

The main application of nano silver colloid is not limited to the following:
Medicine: antibacterial and anti-infection, repair and regeneration of tissues;
Electronics: conductive coating, conductive ink, chip packaging, electrode paste;
Daily necessities: anti-static, anti-bacterial coating/film;
Catalytic materials: fuel cell catalyst, gas phase catalyst;
Heat exchange materials; electroplating coating materials.

Healthy living environment has become the goal of human beings. Therefore, environmental microorganisms that harm human health also attract people's attention.Antibacterial activities
 are always an important task for people to protect our health.With the development of science and technology, nano antibacterial materials arewidely used in air purification, sewage treatment,
 plastic products, architectural coatings, medical health and other fields.

Classification of some of the most commonly used nano antibacterial materials

1. Metal nano antibacterial material
a.Silver nanoparticles(in powder form)
b.Silver nanoparticles dispersion(in liquid form)
c. Colorless transparent nano silver dispersion(in liquid form)

2.Metal oxide nano antibacterial material
a.ZnO Zinc oxide nanoparticles
b. CuO Copper oxide nanoparticles
c. Cu2O Cupous oxide nanoparticles
d. TiO2 Titanium dioxide nanoparticles(photocatalysis)

3.Core-shell nanoparticles
Ag/TiO2 Nanoparticles,Ag/ZnO nanoparticles.etc

Application of nano antibacterial materials
1. Nano antibacterial coating
The antibacterial and mildewproof coating, air purification coating and antifouling self-cleaning coating were developed by adding the above-mentioned nano antibacterial materials into the coating, and remarkable purification effect was obtained.

2. Nano antibacterial plastics
The addition of a small amount of antibacterial materials can give the plastic long-term antibacterial and bactericidal ability.Plastic antibacterial material added amount of 1% can be in the plastic long - term antibacterial and sterilization.
Applications of antibacterial plastics include food appliances, electronic communications, household appliances, building materials, office supplies, toys, health care, and household products.

3. Nano antibacterial fibers
Because fiber can absorb a lot of microorganisms, if the temperature is appropriate, the microorganisms will multiply rapidly, thus causing a variety of harm to the human body.
 Textile fiberantibacterial is an important link to ensure people's health.

4. Nano antibacterial ceramics
The antibacterial surface of ceramic tableware is realized by adding nano antibacterial materials.

5. Nano antibacterial building materials
Modern buildings have good air tightness, insufficient heat insulation and ventilation, and the walls may be dewy and humid, which provides favorable conditions for the reproduction and proliferation
 of fungi and other microorganisms.The use of antibacterial building materials, antibacterial coatings and antibacterial paints can greatly reduce the survival rate of bacteria on furniture surfaces,
 indoor walls and indoor air, which is an effective way to reduce the probability of bacterial cross infection and contact infection.

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