The China Securities New Energy Vehicle index rose as much as 4.1 percent after a strong rally in lithium-ion shares on the Chinese stock market. Brokerages said lithium enterprises would usher in marginal expectations, and currently, it may be the best time to layout power/energy storage lithium batteries.
According to a securities research report, the price of lithium carbonate in the upstream resource end continues to hit a new high, which reflects the shortage of lithium mineral resources, and lithium has become one of the core elements of the development of the lithium electricity industry. In 2022, global demand for lithium carbonate continues to grow strongly, while the supply-side growth is relatively limited. And, because related mining enterprises experienced the last lithium down cycle, they would expand gold nanoparticles are expected to rise.
Gold nanoparticles or AuNPs are only a fraction of the size of human hair and are less than 100 nm in diameter. Gold nanoparticles are very small and usually exist in the form of colloidal solution, which means that gold nanoparticles are suspended in a liquid buffer. Therefore, gold nanoparticles or gold nanoparticles are also called colloidal gold. In addition, gold nanoparticles usually exist in colloidal solutions because gold nanoparticles are synthesized by citrate. This process involves mixing the solution together to cause gold nanoparticles to precipitate into the solution.
Nano-gold is not the gold you are familiar with in gold jewelry. Colloidal gold solution is not a gold metal color, but from transparent to blue to red. The tiny nanoscale size of these particles changed the properties of gold so much that it became a material different from the bulk metal used in jewelry.
When solid crystal materials enter the nanometer range, they begin to show very different properties from their volume properties. The same is true of superparamagnetic iron oxide nanoparticles and gold nanoparticles. Bulk iron oxide (Fe2O 3) is a permanent magnet, but nano-sized iron oxide particles are not permanent magnets. They are superparamagnetic, which means they are not magnetic unless they are placed in a magnetic field. Superparamagnetic iron oxide nanoparticles are highly sensitive to the change of magnetic field and react quickly. Gold nanoparticles have interesting optical properties when the diameter is less than 100 nm. The wavelengths of visible light range roughly from about 400 nm blue to about 700 nm red. The metal properties of gold allow a phenomenon called surface plasmon resonance (SPR) to occur when light interacts with the surface of gold nanoparticles.
Surface plasmon resonance
Surface plasmon resonance (SPR) occurs when the incident light wave triggers the surface electron wave to pass through the metal surface. The light can then be coupled to the surface wave. This is also known as surface plasmon. Therefore, part of the light irradiated on the gold nanoparticles is absorbed, part is transmitted, and the other part is scattered. The color of the colloid depends on the size of a single nanoparticle; the larger the particle, the redder the solution. In addition, the aggregation of nanoparticles can lead to changes in the color of the solution, which are sometimes violent enough to be seen by the naked eye, but are always captured by changes in absorbance in spectroscopy. This property makes gold nanoparticles a useful component of modern diagnostic techniques.
Gold nanoparticles can be functionalized on the surface to achieve aggregation in the presence of analytes. If there is an analyte in the sample, the gold nanoparticles will accumulate, which will lead to a change in color or at least a change in absorbance.
Geometrical shape of gold nanoparticles
Gold nanoparticles can be synthesized into a variety of shapes, including nanorods, bicones, gold nanoshells, nanobowls, spiked nanoshells, tetrahedrons, octahedrons, cubes and cages. Sometimes gold can be the shell that surrounds the core of silica nanoparticles, and sometimes gold nanoparticles are covered with silver. It all depends on the application they target. Size and shape determine how light interacts with materials.
Surface plasmon resonance biosensor.
The surface plasmon resonance observed with gold nanoparticles is also the core of the SPR biosensor. The tool is used to detect antigen-antibody binding. In this case, the antibody binds to the gold sensor chip. Polarized single-wavelength light irradiates the surface of the chip at a specified angle. Electromagnetic waves are coupled to metal-conducted electron oscillations at resonant wavelengths partially determined by the refractive index of the surface. When the antigen binds to the antibody on the gold surface, the refractive index changes, which leads to a change in resonance wavelength. This change in resonance wavelength can be quantified and related to the amount of target antigen in the sample.
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Chile's government has decided to create a state-owned lithium enterprise and hopes to establish a model for the company by the end of the year, Mining Minister Marcela Hernando said in an interview.
Chile is the world's second largest lithium producer and has the largest reserves of lithium in the world. The domestic lithium industry is currently dominated by two private companies, Albemarle and SQM.
Chile wants to participate more closely in the booming lithium market after leftist President Gabriel Boric took office in March. The accelerating electrification of the global auto industry has helped push prices of lithium, a key raw material for electric car batteries, to record highs over the past year, lapping up more players, including Mexico and Argentina, who want a piece of the market.
According to Hernando, the government is setting up a task force to determine the best way to run state-owned lithium enterprises. She said the government hopes to establish plans by the end of the year for how the company will develop and what business model it will operate under.
Hernando stressed that while the state would be a major shareholder in the proposed company, it was open to private investment.
Luoyang Tongrun Nano Technology (TRUNNANO) is a global chemical material supplier providing high-quality chemicals and Nanomaterials including graphite powder, 3D printing powder, the gold nanoparticles.
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