"Most of the nano-material has a characteristic size is smaller, the greater the toxicity. Because of the smaller size, its surface area, the higher the reactivity, followed by other substances into the organism the possibility of reaction the greater. "
Nano, has been more and more into our lives, nano Paint , Nano Clothing , Nano cosmetics, nano-batteries, it seems that everything around us can be "nano." However, a recent study found that Beijing Chaoyang Hospital, Paint Containing nanoparticles can result in serious human pulmonary fibrosis, and even death.
"Bare nanoparticles into the human body, if, indeed is a great harm." Solid State Physics, Chinese Academy of Sciences Institute of the original director, senior fellow, former chief scientist of nano-materials, Zhang Lide told "Beijing Science and Technology News", a nanometer is very small particles, one nanometer is equal to one billion per 1 meter. Simple analogy is, to a diameter of 0.05 mm of hair were divided into 50 000 copies, each about the thickness is 1 nm.
This tiny nanoparticles, through the air into the lungs, can cause pulmonary fibrosis; if enter the body, because it is too small, it will default to the virus body and metabolism in the liver; even some nanoparticles , but also into the human brain, these nano-particles flow along the cerebral blood vessels, eventually forming blood clots blocking blood vessels; nano-materials on human vascular wall also had a destructive effect, as the surface activity of nano-high, it will snatch the blood vessels cells Electronic To speed up the aging vessel. All of these nano-particles will be deposited in the person's body, not metabolic out.
Abroad, there are similar experiments to prove, NASA Space Center's team has the lungs of mice with spray solution containing carbon nanotubes and found that carbon nanotubes will enter the alveoli in mice, and the formation of granuloma. Researchers at the University of Rochester in New York so that mice with a diameter of 20 nm PTFE particles in the air for 15 minutes, most of the mice died within the next 4 hours, while another group of mice exposed to a diameter 120 nano-particles in the air, then the safe.
"Most of the nano-material has a characteristic size is smaller, the greater toxicity. Because of the smaller size, the greater its surface area, the higher reaction activity, followed by other substances into the organism response the greater the chance. "Chinese Academy of Sciences, a nanotechnology expert on condition of anonymity told the" Beijing Science and Technology News ", in the face with the toxicity of nano-particles, the body's own resistance but not strong, although the semipermeable membrane of human cells allows only water and salt into the exchange, but microporous semipermeable membrane is only 10 nm, if the size of the smallest nano-materials invasion, this layer of protective film is powerless. In addition, the human skin with a negative, you can exclude part of swap with the negatively charged nanoparticles invasion, but this layer of negative electrode of its weak resistance limited.
Addition to the human body have been affected, the nano-material impact on the environment there are potential risks.
"Some contain nano materials, batteries, household appliances, Plastic Products , Rubber products Even Chemical industry Products. If exposed to air, water and soils, if not in time, the cumulative effect over a long period can cause serious impact to the ecological environment, they can also biosphere, food chains, direct impact on human health. "Lide said, in addition to some nanomaterials are likely to wind transport, or suspended in the atmosphere at the top, and suspended in the atmosphere of other chemicals to form larger aggregates of the interaction, the effect of gravity deposited, left in the water and soil in. Despite such exposure to nanomaterials in the environment is also minimal, but with use of artificial nano-materials exposed to increased opportunities to conduct research in this area is necessary.
"However, nothing is absolute, and not demonizing the impact of nano-materials on humans, nano is a rigorous science." Lide said some tiny particles indeed have adverse impact on human beings, but not only as one of the representatives of the Nano. In fact a few millimeters, a few microns of the PFA will have a negative impact on the human body. I am an expert from China Manufacturers, usually analyzes all kind of industries situation, such as rc motorbike , remote control snowmobile.
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