Nano-silicon dioxide powder (SiO2) is an inorganic non-metallic material with a particle size in the range of 1-100 nanometers.

Nano-silicon dioxide powder (SiO2) is an inorganic non-metallic material with a particle size in the range of 1-100 nanometers. It has unique physical and chemical properties and is widely used in many fields.
Features of nano-silicon dioxide
1. High specific surface area, nanoparticles are small in size, large in specific surface area (up to hundreds of m²/g), high in surface activity, and easy to combine with other materials.
2. Small size effect: The particle size is between 1-100nm, the specific surface area is large, and the number of surface atoms increases, which makes it have physical and chemical properties different from conventional materials. The nano-scale particle size gives it quantum effects, interface effects, etc., which significantly improves the mechanical, optical and thermal properties of the material.
3. High chemical stability, with good chemical stability, high temperature resistance (melting point is about 1700℃), corrosion resistance, not easy to dissolve, high stability in acids, alkalis and organic solvents, and can maintain its own structure and performance in a variety of complex chemical environments.
4. Surface modifiability
5. Optical properties, high light transmittance, strong ultraviolet light absorption ability, and can shield ultraviolet rays.
6. Low density, lightweight material, suitable for lightweight composite materials.
7. High dispersibility, nano silica particles can be evenly dispersed in a suitable dispersion medium to form a stable colloidal system, which can be evenly added to various matrix materials to achieve material performance modification.
8. Strong optical properties, strong absorption capacity for ultraviolet rays, and high transparency in the visible light range, can be used in sunscreen and optical materials and other fields.

---Main applications of nano silica
- Rubber industry/plastics, as a reinforcing filler, it can improve the strength, wear resistance, and aging resistance of rubber, and enhance the strength and toughness of plastics. It is widely used in rubber products such as tires, hoses, seals, and tapes to improve their performance and service life.
- Ceramic materials, improve the sintering properties of ceramics, reduce the sintering temperature, and improve the density and strength.
- Coatings: Adding to coatings can improve the weather resistance, wear resistance, stain resistance, and adhesion of coatings, and at the same time improve the optical properties of coatings, so that the coating has better gloss and transparency. Functional coatings, used for UV-resistant, wear-resistant, and antifouling coatings (such as automotive paints and building exterior wall coatings).
- Hydrophobic coatings, which achieve super-hydrophobic effects through surface modification, are used for anti-fog glass and self-cleaning surfaces.
- Drug carriers, which use porous structures to load drugs to achieve targeted release or sustained release (such as anticancer drug delivery systems).
- Bioimaging, as a carrier of fluorescent markers or contrast agents, used for cell imaging or diagnosis.
- Tissue engineering, compounded with polymer materials to promote bone tissue regeneration.
- Lithium batteries, as electrode material additives, improve ion conductivity and cycle stability.
- Semiconductor packaging, used as insulating layers or packaging materials for electronic components to improve high temperature resistance.
- Solar cells, as anti-reflective coatings, improve photoelectric conversion efficiency.
- Adsorbents, used in sewage treatment, adsorb heavy metal ions or organic pollutants.
- Catalyst carriers, load metal catalysts, improve catalytic efficiency (such as photocatalytic degradation of pollutants).
- Cosmetics industry, as a thickener or sunscreen, improve product texture and UV protection. Due to its ability to absorb ultraviolet rays and good dispersibility, it is often used in cosmetics as a sunscreen, which can effectively block the damage of ultraviolet rays to the skin without producing a greasy feeling. It can also be used as a thickener and thixotropic agent for cosmetics to improve the texture and stability of cosmetics.
- Food industry, as an anti-caking agent (such as powdered food additives).
- Textile industry, giving textiles antibacterial, antistatic and other functions.
- Green synthesis, developing low-energy, environmentally friendly preparation methods (such as bio-template method).
- Multifunctional, achieving multiple properties (such as magnetism, fluorescence) through composite or surface modification.
- Electronic industry: It can be used to manufacture high-performance electronic packaging materials, integrated circuit substrates and insulating layers of semiconductor devices. Its high purity and good dielectric properties help improve the performance and reliability of electronic equipment.