Our work mainly focuses on the anti microbial and self-cleaning ability of nano coating materials; Surface modification and performance evaluation of orthopedic materials.

Antiviral mechanism of nano materials:

1. H1N1 virus inactivation effect of graphene in aqueous phase and solid surface, > 99% within 60 seconds

2. Graphene edge contact destroys microbial capsule

3. Damage of negative charge density on graphene surface to protein

4. Inactivation effect of ROS (reactive oxygen species) of graphene after amination and hydroxylation

Photocatalytic self-cleaning nano materials：

Recent studies have shown that the p-n junction composed of two different semiconductor materials can greatly improve the absorption capacity of visible light and accelerate the cracking of organic dyes. For example, NiO is a p-type semiconductor material and CDs is an n-type semiconductor. CdS nanoparticles adhere to the surface of NiO crystal plate, resulting in the change of energy band structure. Therefore, more free electrons are generated on the surface of CDs and more electron holes are generated on the surface of NiO. The results show that the absorption efficiency of Congo red dye is improved several times.

Surface anti microbial modification of glass and engineering plastics：

Glass and plastic are widely used in touch screen, food packaging, electrical appliances, transportation equipment and other fields. Preliminary studies show that polymers with some polar surface functional groups help to destroy microbial cell membrane, have anti microbial function, and help to fix nanoparticles, biomolecules and drugs. Nano scale two-dimensional materials can enhance the catalytic performance of solid surface and may greatly improve the anti microbial efficiency because of their light absorption ability and excellent conductivity.

The author cooperated with Professor R. handy, a famous British nano toxicologist, to produce TiO2 nano porous structure on the surface of titanium alloy and inlay a variety of nanoparticles. For example, anti microbial nanoparticles such as Ag, ZnO were implanted by sol-gel method. The results show that the material has good antibacterial property and is helpful to avoid early infection and failure of dental and orthopaedic implant implantation. There are indications that the antibacterial properties of the material are related to the photocatalytic properties of oxides.

Antimicrobial efficiency of film spray

We have prepared and tested the effects of a variety of nanocomposite anti microbial film sprays on bacteria themselves and on different substrates (aluminum alloy, titanium alloy and engineering plastics, etc.), killing 99.9999% of bacteria in 60s. The self-designed artificial joint simulation testing machine has been processed and entered the stage of assembly and commissioning.