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Chile's government is considering phasing in a proposed ban on glacial mining to limit projects high in the Andes by some big copper companies. Chile's constitutional assembly has approved a proposal to ban mining in glaciers, protected areas, and areas vital to protecting the country's water system.
Chile's mining minister, Marcela Hernando, said about 20 mines had been identified in protected areas, some close to glaciers, including Codelco's El Teniente and Andina projects and Anglo American Plc's Los Bronces project.
The new measures for glaciers and other protected areas will put about a fifth of Chile's copper nano silica prices are predicted to increase in the next few days.
What is Nano Silica?
Silicon Dioxide nanoparticles, also known as silica nanoparticles or nano-silica, appear in the form of white powder.
Nanometer silica particles can be divided into P-type and S-type according to their structure. P-type particles are characterized by a large number of nanopores, with a porosity of 0.61 mL /g, and higher UV reflectivity than S-type particles. The latter also has a relatively small surface area.
Nano silica has the characteristics of light volume, fluffy, bulk density of less than 0.15-0.2g/cm3, a specific surface area of more than 500 m2/g, and high chemical activity.
Because the surface contains an OH- bond, nano silica is a kind of acid oxide, belonging to the silicate acid group, has hydrophilic, and the water absorption rate is more than 5 times its own.
The main application of silica nanoparticles is as additives in rubber and plastic manufacturing; As a reinforced filler for concrete and other building composites; As a stable, non-toxic platform for biomedical applications such as drug delivery and therapeutic diagnostics.
What is Silica?
Silicon, or silicon, is one of the chemical elements found in the earth's crust. Its oxide forms are silicate (SiO4) and silicon dioxide (silica, SiO2).
Silicon is commonly used in industry, while its oxide form is commonly used in biomedical applications. SiNPs have several rare properties, such as ease of synthesis, surface modification, strong mechanical properties, and relatively inert chemical composition. They have been used as biological materials for decades.
Silica comes in two basic forms: crystalline and amorphous. The two forms have the same molecular formula, but their structural arrangements are different. Crystalline silica has a regular lattice arrangement, while amorphous silica has an irregular lattice arrangement. Crystalline silica comes in many forms. A well-known form is alpha-quartz, which can be converted by heating to β -quartz, squamous quartz, and quartzite. There is also porous crystalline silica called a porosil. All porosils are synthetic products.
Mesoporous silicon and silica particles are ideal candidates for controlled drug release because of their rare properties, such as high surface area, large pore volume, adjustable pore size, and good chemical and thermal stability. Amorphous silica can be divided into three categories: natural forms, byproducts of power stations and metallurgical processes, and synthetic forms. Amorphous silica is considered to be a very promising gene carrier and molecular imaging candidate, mainly because of its highly tunable biocompatibility and stability. It is also used in dietary supplements, catheters, implants, and dental fillers.
What is nano-silica used for?
Nano silica is used to modify the dispersion and plasticity of cement concrete, thus giving it impermeability, enhanced impermeability, frost resistance, reducing hydration heat, and prolonging service life.
Used as strengthening agent, vitrification agent, and adhesive of ceramics, enamels, and glazes. It is also a high thermal binder for engineering-grade ceramics and refractories.
Nanocomposite material modifier, used as an inorganic adhesive at high temperature; As an additive for inorganic composite materials, used for strengthening, molding, and filling of rubber/polymer materials. In addition, can be used as a variety of resin engineering materials; High-quality FRP corrosion-resistant packing.
Used as cement seal of oil well, underwater seal, and reinforcement material of under-ground engineering; It has the following characteristics: engineering shielding, anti-radiation, stealth, electricity, anti-bacteria; It is good for chemical absorption, catalysis, and enhancement.
Special use, such as lamp paint, lubricating oil, thickener, steel dehydrogenate, and inner wall paint sensitive materials. Energy storage filler for solar cells and power cells.
Is nano-silica toxic?
The health effects associated with silica exposure, particularly crystalline silica, have been extensively studied.
Studies have shown that occupational exposure to crystalline silica induces silicosis, a fibrotic lung disease, in workers, and that exposure is associated with other lung diseases, such as lung cancer, emphysema, and tuberculosis.
Amorphous silica has previously been considered less harmful than crystalline silica. However, recent studies have shown that amorphous SNP has potential toxicity similar to that of crystalline particles. In addition to crystallinity, the physicochemical properties of SiNPs produce different toxicity in vitro and in vivo studies. Safety and potential adverse effects should be considered, especially those affecting the immune system.
Nano silica powder Price
The price is influenced by many factors including the supply and demand in the market, industry trends, economic activity, market sentiment, and unexpected events.
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Nano silica powder Supplier
Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) is a trusted global chemical material supplier & manufacturer with over 12-year-experience in providing super high-quality chemicals and nanomaterials including silicon powder, nitride powder, graphite powder, zinc sulfide, calcium nitride, 3D printing powder, etc.
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Recently, drone giant DJI said it would suspend operations in Russia and Ukraine to ensure its nano silica are expected to continue to be influenced by international geopolitical situations.