The role of nano silicon oxide, the use of nano silicon dioxide

Due to the quantum size of nano SiO2, quantum tunneling effect and its special optical and electrical properties, high magnetoresistance phenomenon, nonlinear resistance phenomenon and high strength, high toughness, good stability and other singular characteristics under high temperature, nano SiO2 can be widely used in many fields, involving almost all industries applying SiO2 powder, bringing epoch-making significance for the upgrading and upgrading of traditional products! At present, nano-silica is mainly used in the following fields:

1, application in biomedical engineering

In the early 1980 s, people began to use nano-particles to realize cell separation and establish a new technology for cell separation with nano-SiO2 particles. The method is mainly to prepare nano SiO2 particles (particle size 15 ~ 20nm), and then its surface coated with a single molecular layer, the choice of coating layer is mainly determined according to the type of cells to be separated, and then the preparation of polyethylene pigolone containing a variety of cells colloidal solution; then the nano SiO2 coated particles are evenly separated into polyethylene pigolone colloidal solution containing a variety of cells, the required cells are isolated using the density gradient principle. The advantage of this method is that it is easy to form a density gradient, to achieve rapid separation of nano SiO2 particles and cells, and nano SiO2 particles generally do not react with colloidal solutions and biological solutions, and do not pollute biological cells. Nano-SiO2 has been widely used in pharmaceutical preparations due to its high absorbency, dispersibility and thickening properties. For example, adding a small amount of nanoSiO2 to ranitidine, metrizamide and pyridamine can change their fluidity. Adding a small amount of nanoSiO2 to griseofulvin can change its dissolution rate, I .e. change the dispersibility and absorption of insoluble drugs in water. Adding a small amount of nanoSiO2 to the powder containing aspirin will change the antistatic property of the powder.

Nanosilica Source: Kokeyou official website

2, Application in Optical Field

Single-layer films and multilayer films synthesized by nanomaterials are mainly used as infrared reflective materials. Nanoparticle membrane materials have a good application prospect in the bulb industry. Since the 1980 s, people have used nano-SiO2 and TiO2 to make multilayer interference films, lining the inner wall of the bulb cover, and the result is not only good light transmittance, but also has a strong infrared reflection ability. The bulb with this multilayer film can save electricity by 13.15. Nanoparticles as optical fiber materials can greatly reduce the transmission loss of optical fibers. High-purity nano-SiO2 as an optical fiber has a transmission loss of less than 10db/km for light with a wavelength greater than 600nm, which is many times smaller than the transmission loss of conventional SiO2 materials.

3. Application in Electronic Packaging Materials

High-purity spherical nano-SiO2, as a new type of mineral material in short supply, has broad application prospects in many fields such as electronics and electrical appliances due to its superior properties such as high dielectric, high heat resistance, high humidity resistance, high filling capacity, low expansion, low stress, low impurity and low friction coefficient, it is the main raw material necessary for large-scale integrated circuit packaging. At present, most of the electronic packaging materials at home and abroad are high polymers, among which epoxy resin filled with 70% ~ 90% high purity spherical nano silica powder is widely used. The high water absorption and viscosity of epoxy resin limits its application in large-scale integrated circuits. A large amount of silica powder can be added to epoxy resin, which can reduce the thermal expansion coefficient, water absorption, internal stress, shrinkage and improve the thermal conductivity of the molding compound.

4, Application in Rubber Modification

Rubber is an elastomer with excellent flexibility, but its comprehensive performance is not satisfactory. In the process of producing rubber products, carbon black is often added to the rubber compound to improve strength, wear resistance and aging resistance. However, due to the addition of carbon black, the products are black and of low grade. The advent of nano-SiO2 in China has laid a material foundation for the production of a new generation of rubber products with novel colors and excellent performance.

5, Application in Coatings

Nano SiO2 has special optical properties that conventional SiO2 does not have. It has strong ultraviolet absorption and infrared reflection characteristics. It is added to the coating can make the coating to form a shielding effect, to achieve the purpose of anti-ultraviolet aging and thermal aging, while increasing the thermal insulation of the coating. Nano SiO2 has a three-dimensional network structure, has a large specific surface area, showing great activity, can form a network structure when the coating is dried, while increasing the strength and smoothness of the coating, but also improve the suspension of the pigment, can keep the color of the coating unchanged for a long time. In the building interior and exterior wall coatings, if the addition of nano-SiO2 can significantly improve the opening effect of the coating, the coating is not layered, with thixotropy, anti-flow hanging, good construction performance, especially the anti-contamination performance is greatly improved, with excellent self-cleaning ability and adhesion. Nano SiO2 can also be used with organic pigments to obtain photochromic coatings.

6, Application in Plastic Engineering

Adding nano-SiO2 as an additive to plastics not only has the reinforcing effect of conventional SiO2, but also enables plastics to have many new characteristics. Nano-SiO2 is used to modify the surface of optical plastics, which can form a hard coating on the surface of the plastic, and improve the wear resistance and scratch resistance of the plastic surface. For example, the Japanese plate nitrate company uses PLD method to form a dense nano SiO2 film with strong adhesion on the surface of the plastic, so as to obtain excellent effects such as improving weather resistance, drug resistance, wear resistance, giving antifouling, and improving the adhesion of inorganic substances. If nano SiO2 is used for translucent plastic film, it can improve the transparency, strength and toughness of the film, and the waterproof performance is also greatly improved. This kind of film can be used as a special purpose film. In general plastics, if the addition of nanoparticles can make it achieve the performance of engineering plastics. If nano-SiO2 is added to polypropylene, its strength can be comparable to that of engineering plastic nylon.

7. in the application of pigments

has. Although the machine pigment has bright colors and strong tinting power, but generally its light resistance, heat resistance, solvent resistance and migration resistance are often less than inorganic pigments. The researchers modified the surface of organic pigments by adding nano-SiO2, which not only greatly improved the anti-aging performance of the pigments, but also improved the brightness, hue and saturation to a certain extent, which greatly broadened the grade and application range of organic pigments.

8, Application in Adhesives and Sealants

Sealants and adhesives are important products with large quantity, wide coverage and wide application range. It requires product viscosity, fluidity, curing speed to meet the limited conditions. It is reported that foreign products in this field have used nanomaterials as additives, and nano-SiO2 is the recommended material. The mechanism of action is to coat a layer of organic material on the surface of nano SiO2 to make it hydrophilic. Adding it to the sealant can quickly form a silica structure, that is, nano SiO2 forms a network structure, controls the flow of colloid, accelerates the curing rate, improves the bonding effect, and increases the sealing property of the glue due to the small particles.

9, Application in Ceramic Products

Ceramic has the characteristics of high compressive strength, corrosion resistance and heat resistance, good insulation, etc. Its disadvantage is that it is brittle and requires high temperature firing. Researchers add the right amount of nano SiO2 in ceramic products, greatly reducing the brittleness of ceramic products, so that its toughness increased several times or even dozens of times, the finish is also significantly improved, but also make the ceramic can be fired at a lower temperature. In addition, the application effect of nano SiO2 in ceramic filter screen, corundum ball and other ceramic products is also more significant.