Physical preparation of nano powders

Nano powders, also known as nanoparticles, generally refer to ultrafine particles between 1 and 100nm in size. Some people call them ultrafine particles. It is larger than a cluster of atoms and smaller than ordinary particles. In terms of its size, assuming that each atom is one angstrom in size, it contains between 1000 and 1 billion atoms. It’s smaller than a normal living cell, about the size of a virus. Nanoparticles are spherical, plate-like, rod-shaped, angular, spongy and [...]

Shanghai silicate institute has made progress in the research of BiVO4 based photoanode materials

Solar photoelectric chemistry (PEC) cracking water is an effective method to convert solar energy into hydrogen energy. Among many semiconductor photoanodes, BiVO4 is an excellent photoanode material due to its suitable conduction band, valence band position and forbidden band width. BiVO4 has a light absorption edge of 515nm and a theoretical maximum photocurrent density (Jmax) of 7.5ma cm-2 under AM1.5 sunlight. However, the actual photodecomposition hydroelectricity current density (JH2O) is much lower than its theoretical value, mainly because BiVO4 [...]

Research on nano aluminum nitride in thermal conductive plastics

1. Heat-conducting silica gel and epoxy resin: Ultra-high thermal conductivity nano-aln composite silica gel has good thermal conductivity, good electrical insulation, wide electrical insulation service temperature (working temperature -60℃- 200℃), lower consistency and good construction performance. Products have reached or exceeded imported products, because can replace similar imported products and widely used in electronic devices heat transfer medium, improve work efficiency. Such as CPU and radiator gap, high-power audion, thyristor element, diode, and the substrate contact with the thin seam [...]

Trillion-yuan battery market: global solid lithium battery research and development process

1. Continuous upgrading of energy and safety performance, outstanding advantages of solid lithium batteries Solid state lithium battery is expected to be an important development direction of the next generation of lithium battery. Countries around the world have formulated research and development goals for lithium batteries with high energy density. The Japanese government takes the lead in proposing the goal of “the energy density of battery cells for pure electric vehicles to reach 250Wh/kg by 2020 and 500Wh/kg by 2030”. [...]

Research and application of aluminum nitride and aluminum nitride ceramics

Aluminum nitride (AlN) is a kind of integrated high performance new ceramic material, has excellent thermal conductivity, a reliable electrical insulation, low dielectric constant and dielectric loss, non-toxic and match the silicon thermal expansion coefficient, and a series of excellent features, is considered to be * * a high degree of the semiconductor substrate and the ideal of the electronics packaging materials, wide attention by the researchers at home and abroad. In theory, the thermal conductivity of AlN is [...]

Thermal and optical properties of nanometer tin oxide

In terms of thermal properties, nano SnO2 can be attributed to an ATO raw material, and its heat insulation mechanism: The SnO2 crystal has a regular tetrahedral rutile structure, and the anion coordination number is 6∶3. Each tin ion is adjacent to 6 oxygen ions, and each oxygen ion is adjacent to 3 tin ions. After antimony doped ions in SnO2, occupy the position of the lattice Sn4 +, forming a positive charge one price center SbSn and an extra [...]

How to analyze the fiber strength of potassium titanate whisker

In recent years, potassium titanate whisker achieved breakthrough on the manufacturing cost, combined with the diverse, more and more attention, the performance is very excellent after wear test proves that the potassium titanate whisker reinforced material products even after wear test its surface finish and no big change, potassium titanate whisker was originally by NASA as Saturn rocket nozzle of insulation material development. In view of the rocket launch a flushing high temperature and high pressure air flow, filling [...]

Types and applications of zirconium oxide materials

Zirconium oxide is a kind of high temperature resistance, corrosion resistance, wear resistance and good electrical conductivity of inorganic non-metallic materials, that should be used for refractory material field in the early 1920 s, until the mid – 1970 – s, Europe and the United States, the advanced countries in the world have had the same person research and development of zirconium oxide production technology and zirconium oxide series products production, further to expand application field of zirconium oxide [...]

To introduce the preparation of strontium titanate

Research progress of preparation methods of strontium titanate at present, the main preparation methods of strontium titanate are sol thermal method. Sol-sol-whether in metallic materials, or in organic and inorganic non-metallic materials, adding appropriate amount of strontium and its compounds can change some of its properties and even make it have special functions, so it has the name of metal monosodium glutamate. Strontium titanate (SrT iO 3) is one of the important strontium compounds. Strontium titanate has the advantages of [...]

Select bismuth titanate specific work introduction

Bil2Ti020 material was prepared by solution hydrothermal method. Crystals with graded structure such as micron ball, micron flower, nanorod and nanowire were synthesized. For controllable morphology, this paper analyzes the reaction temperature, reaction time, pH and PVA concentration on Bil2Ti020 morphology and structure, the influence of the reaction parameters of the material controllable morphology, proposed the nanoparticles a micron spend a growth mechanism of nanowires – micro ball and focuses on the material of optical and light catalytic properties. [...]