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Aluminum Oxide Nanopowder

 

Alumina is a diverse class of metallic oxides, main polymorphic forms include the most common are type a and y, crystalline transition mainly depends on the temperature. Aluminum hydroxide or hydrated aluminium oxide is heated to 800 degrees Celsius converted into y-alumina and 1200 degrees Celsius converted into a-alumina. Structures and properties of alumina-special features to make it in the electronics, chemical, aerospace and other fields has been widely used. With the development of high technology and society more and more attention on new materials, domestic and foreign workers to pay great attention to the development and application of new materials, all kinds of material with special functionality to get people’s attention. Among them, the micronization of substances considered to be materials development research foundation. Superfine powder usually refers to the scale the so-called molecular, Atomic and macroscopic objects, the granularity (1-100) particles in the nm range.

High pure Super fine Aluminum Oxide Nanopowder is purity in 99.99% above of super micro-powder body material, is 21st century materials in the production maximum, and output Supreme, and uses most wide of tip material is one of, high pure alumina powder body due to its purity high, grain diameter small, displayed out has general material by not has of light, and electric, and magnetic, and heat and mechanical characteristics, thus it as a new function material widely application Yu optical, and chemical and the special ceramic, multiple field. Overseas studies on Nano-alumina work carried out earlier, the technology has advanced. Following is some has representative of research results: in gas phase method in the, United States of Chen y j with gas phase rule prepared out grain diameter for of no reunion alumina nano particles; with gas phase hot solution to three methyl aluminum Al (CH3) 3 and N20 for material, joined C2H4 as reaction sensitive of agent, used C02 laser (C2H4 in C02 laser launches wavelength at has resonance absorption) heating for reaction, Then 1200-1400 deg heat successfully synthesizes A1203 particle diameter of 15-20nm; Japan patent by evaporation-condensation method, alumina (purity of 99.99%) as the evaporation source and put them in a pressure up to 0. 01 Pa in a vacuum, into 02,CO or C02, keeping pressure at 15Pa alumina ceramics using C02 laser irradiation makes it evaporate, in alumina in gas evaporation cools rapidly to get ultra high-purity alumina. In liquid phase method in the, Felde b with sol-gel glue method, to ISO butanol aluminum for precursor body, joined acetyl acetone and ammonium nitrate, by hydrolysis, and sank of formed gel glue, again by dry, and forged burn get grain diameter for 50nm of Alpha-A1203 particles; France of Eponthieu using nitric acid aluminum, and xylene, and tween80 composition micro emulsion system, business got 40-50nm of alumina particles. Study of nano-alumina in China is from the beginning of the 90 ‘s, which was mainly concentrated in the Chinese Academy of Sciences and universities during 10 years in 1990-2000, China to break Western embargo on China. Has set up a variety of physical and chemical method for preparation of nano-materials. Research on Nano-Alumina was also a certain degree of progress.

At present, the preparation of Aluminum Oxide Nanopowder mainly stay at the trial stage, and conducted some exploration of the industrialization level of production, but most of the preparation methods of nano-alumina wide particle size distribution, and poor preparation process is repeated. There are a lot of basic work requires a lot of manpower and resources to complete.

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Nano silver antibacterial is widely used

Nano-Silver as a special form of the metal silver, refers to the particle size of powders of 1~100nm metallic silver granules. Since the particles are extremely small and large surface area, so that it will have significant surface effects, quantum size effect and the quantum tunneling effect, which makes silver with superior permeability activity and its bactericidal effect is hundreds of times times the ordinary silver. In addition, due to the nano-scale electronic properties of metallic silver, it can be used with sparse radicals on bacterial proteins, amino group electron withdrawing groups formed, such as ligand, which further enhances the antibacterial effect. Is a new class of Nano Silver antimicrobial agent, has a strong bacteriostatic and bactericidal action and a broad spectrum of antibacterial activity, and inorganic antibacterial effect of antibacterial agent is unable to compare with traditional, non–resistance, and high security. With the serious of antibiotic bacterial resistance, study and application of Nano-Silver disinfect areas increasingly wide attention.
Humans found Silver Nanoparticles Antimicrobial for a long time, as early as in ancient times, useful silver food storage to prevent bacteria growth record. With the progress of science and technology, it was discovered that silver is a safe and broad spectrum bactericidal materials apply it gradually spread. Now clinical Shang people has widely using sulfa pyrimidine silver, and fluoride piperazine acid silver, and zinc silver breast cream, and sulfa pyrimidine silver collagen protein film, and irradiation fluoride silver pigskin, treatment Burns burns to prevent green pus bacteria, bacteria of reproduction, nitric acid silver water solution as eye anti-inflammatory, and Silver Mercury alloy as dental material and the containing silver water solution treatment toothache, and glue State silver in gynecological lotion in the are application widely. Also available on a daily basis in activated carbon containing silver or silver woven filters purify drinking water, and so on.
Silver Nanoparticles principle. Nano Silver due to its structure unit size between macro material and micro Atomic and molecular Zhijian, performance out special of surface effect, and small size effect, and quantum size effect and macro quantum tunnel effect, can easily to entered disease original body; Nano Silver particles size small, surface by accounted for of volume percentage big, surface of key State and electronic State and particles internal different, surface Atomic distribution bit not congruent led to surface of activity location increased, has has as antibacterial agent of basic conditions; has is strong penetrating force, Have full access to and attack pathogens, thereby fostering stronger biological effects, high security, and antibacterial wide advantages of long continuous sterilization time. Antibacterial properties of silver nanoparticles in particular, pathogenic bacteria, cocci, bacteria killing effect of silver ion is much larger than the traditional disinfectant. Silver nano-particles can kill bacteria, fungi, Mycoplasma, chlamydia, and other disease-causing organisms.
Nano Silver antibacterial agent of role main including 3 a links and pathogens metabolism enzyme in the of sh base combines, makes enzyme lost live and exposed of bacteria cell wall occurred peptide poly sugar reaction, formed reversible composite real, makes bacteria cannot will oxygen and energy trans-into cell and pathogenic microbial in the of DNA combines, led to DNA structure degeneration, inhibition DNA copy. In addition, the Nano-Silver and non-antibiotic antimicrobial agent, of silver ions do not develop resistance in bacteria, is a long-acting antibiotic agents.
Application of Nano-Silver. Nano-materials because of their size decreases, surface area, surface energy and surface tension are greatly increased, with volume effect and quantum size effect, make it light, heat, electric, magnetic, mechanical and chemical properties is quite different from the traditional characteristics of materials. Silver nano-particles with UV resistance, absorption of visible and infrared radiation, high strength and toughness, good conductivity and shielding effects, antimicrobial, antiseptic, deodorant, and other outstanding features. At present, Nano-Silver anti-bacterial nonwovens material of a variety of medical, health, household and industrial use of antibacterial products already listed.