Recently, Li Guanghai, a researcher at the Institute of Solid State Physics at the Chinese Academy of Sciences' Hefei Institute of Physical Sciences, used high-energy pulsed laser irradiation to produce amorphous titanium oxide with intermediate absorption bands—intermediate band titanium oxide. Related results were published in the Journal of Materials Chemistry A (2015, 3, 11437-11443) and have applied for invention patents. Titanium oxide is widely used in photocatalytic degradation of pollutants, photovoltaic power generation and other solar energy applications, known as "solar materials." Since the band gap of titanium oxide is in the ultraviolet region, the energy absorption efficiency in the visible and infrared regions, which account for 93% of the solar radiation, is very low, which greatly limits the effective utilization of solar energy by titanium oxide. In order to solve the above problems, the research team used high-energy pulsed laser irradiation technology to produce amorphous titanium oxide with intermediate absorption bands—intermediate band titanium oxide. The middle absorption band between the amorphous titanium oxide conduction band and the valence band acts as a “ladderâ€. The valence band electrons excited by the long-wavelength photons are absorbed by the intermediate band's relay and enter the conduction band; short-wavelength photons can directly excite the valence band. Electronic transition to conduction band. Titanium dioxide in the middle has significant absorption efficiency and excellent visible light catalytic activity in the wide solar spectral range of the ultraviolet, visible and near-infrared regions. Working with the Hong Kong Polytechnic University, Li Guanghai's research group found that intermediate-band titanium oxide can significantly improve the photoelectric properties of dye-sensitized solar cells. Titanium oxide in the middle zone is expected to be applied in the fields of environmental pollutant treatment and energy conversion. The study was funded by the National Natural Science Foundation of China, the National Postdoctoral Foundation "Hong Kong Scholars" program and general projects.
High Purity Graphite refers to Graphite Carbon content > 99.99%, widely used in high-grade refractory material and coating of metallurgy industry, military industry, fire engineering pencil lead on material stabilizer, light industry, electrical industry of carbon brush, electrode of battery industry, fertilizer industry catalyst, additive, etc.
Performance: the scales of crystallization is complete, thin and toughness, good physical and chemical performance, good thermal conductivity, temperature tolerance, self-lubrication, conductivity, thermal shock resistance, corrosion resistance and other properties.
Description: high purity Graphite (aka: scaly high thermal conductivity carbon powder) has high strength, good thermal shock resistance, high temperature resistance, oxidation resistance, resistance coefficient, corrosion resistance, and the advantages of easy to precision machining, is the ideal inorganic non-metallic materials. Used for processing and production of electrical heating components and smelting casting mould structure, high purity metal with boat, single crystal furnace crucible with heater, edm graphite anode, metal plating, sintering mold, tube, semiconductor technology with graphite crucible, launch tube, thyratron and mercury rectifier with graphite anode, grid, etc.
Characteristics and applications: high purity graphite with high strength, high density, high purity, high chemical stability, uniform and compact structure, high temperature resistant, high conductivity, good wear resistance, self-lubrication, easy processing characteristics, widely used in metallurgical, chemical, aerospace, electronics, machinery, nuclear power and other industrial fields. Especially high quality high purity graphite, as an alternative material, has wide application space in high technology and new technology field and has wide application prospect.
The purification methods are divided into two categories: first, wet purification, including flotation, acid and alkali, and hydrofluoric acid. The second is fire purification, including chlorination roasting and high temperature method.
High purity graphite
Is widely used in high-grade refractory material and coating of metallurgy industry, military industry, fire engineering pencil lead on material stabilizer, light industry, electrical industry of carbon brush, electrode of battery industry, fertilizer industry catalyst, additive, etc. High purity graphite through deep processing, but also produce graphite, graphite sealing material and composite material, graphite products, graphite antifriction additives such as high-tech products, become the important nonmetallic mineral raw materials of various industrial sectors.
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