Should there be a standard for the hottest nano sa

2022-09-20
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Should there be a standard for nano safety

should there be a standard for nano safety

February 25th, 2005

now, nanotechnology is becoming more and more common in people's lives, "nano cosmetics", "nano coatings", and sometimes "nano cashmere sweaters" made of leather like effects, and even "nano washing machines", "nano refrigerators", "Nano tea"... In the eyes of some people, "nano" seems to have become synonymous with high technology. In today's "flying nano", the problem of "nano safety" has attracted the attention of scientists, and the reports of "whether nano is harmful to health" which are frequently seen in the newspapers are more worthy of consideration

the increase of respiratory tract patients in foggy days -- is it all caused by nano

on December 1 last year, Beijing was shrouded in thick fog for three consecutive days

in addition to the meteorological department and the Ministry of transportation, another group of people are also paying close attention to the fog. They are scientists who conduct nanotechnology safety research. Researcher zhaoyuliang of the Institute of high energy physics of the Chinese Academy of Sciences is one of them. On December 5, when the clouds cleared, in his office, Beijing, which published a report that "respiratory emergency patients increased by 20% in fog", was prominently placed. He picked up the newspaper and said, "this is all caused by nanoparticles!"

the 243rd Xiangshan scientific conference with the theme of "biological effects of nano scale substances (nano safety)" was held in this fog. The theme report of this meeting was derived from the results of a long-term epidemiological study related to atmospheric particles

based on the epidemiological data of more than 30 cities in Europe and the United States over the past 20 years and the relationship between particulate pollutants in the air, it is found that the incidence rate and mortality of the population are closely related to the concentration and size of atmospheric particles in the ambient air. The smaller the particle size, the greater the harm, and the disease can be completed in sequence after setting one time; The morbidity and mortality rate have increased significantly, and the diseases caused are mainly cardiovascular diseases and lung diseases

"TEFLON" plastic is harmful to health -- is it hard for nanoparticles to escape

at the 2003 annual meeting of the American Chemical Society, three research groups published reports on the special toxicity of nanomaterials. The NASA Space Center research team sprayed a solution containing carbon nanotubes into the lungs of mice and found that carbon nanotubes would enter the alveoli of mice and form granulomas. A DuPont research team also found similar results

researchers at the University of Rochester in New York allowed rats to stay in the air containing polytetrafluoroethylene ("TEFLON" plastic) particles with a particle size of 20 nm for 15 minutes. Most of the experimental rats died within the next 4 hours, while another group of rats were exposed to the air containing particles with a diameter of 120 nm and were safe. In another experiment, the research team also found that nanoparticles can enter the olfactory bulb of rats and migrate to the brain

since April 2003, nature and science have published editor's articles for four times. Environmentalscience technology of the American Chemical Society and many European magazines have also published editor's articles to discuss the bioenvironmental safety of nanomaterials and nanotechnology with scientists in various fields, that is, the impact of nanoparticles on human health Whether there are potential negative impacts on the living environment and social security

nanoparticles may easily invade the natural defense system of human body and other species

: is nanotechnology harmful to health

Zhao Yuliang: from the fact that the size of nanoparticles is equivalent to that of larger proteins, it is easy to think that nanoparticles may easily invade the natural defense system of human body and other species, enter cells and affect the function of cells

: what kind of impact will nano materials have after entering the human body

Zhao Yuliang: will artificial nano materials lead to special biological effects after entering life? Are these effects beneficial or harmful to life processes and human health? Will nanoparticles cross the brain barrier and enter the brain and affect brain function? At present, this is still an unknown field, and we cannot answer these questions. Therefore, who recently called for priority research on the biological mechanism of ultrafine particles, especially nanoscale particles, which have a history of 510 years

at present, some businesses only hype the concept of nano, in addition to the industrialized nano powder, there are not many real nano products

: now some new models claim to use nano coatings, will there be safety problems

Zhao Yuliang: the nanoparticles in the coating are in a bound state, which is different from the particles in a free state, and their properties are closer to conventional substances. Of course, the nanoparticles in the coating may continue to fall off, including all kinds of nano coatings used now. As long as the falling off speed is slow and the dose is small, don't worry. However, there are very few studies in this area. The speed and dose of nanoparticles released under different conditions need to be intensified

: "nano washing machine", "nano coating", "nano cosmetics"... Does so many nano products mean that nanotechnology is very mature

Zhao Yuliang: not necessarily. Due to processing technology, the main function of the nano spring testing machine is to test and analyze the strength of tension, pressure, displacement, stiffness and other strength of precision springs such as tension springs, compression springs, disc springs, tower springs, leaf springs, snap springs, leaf springs, composite springs, gas springs, mold springs, anisotropic springs, etc. the real power of the technology has not yet been brought into play. At present, some businesses only hype the concept of nano. In addition to the industrialized nano powder, there are not many real nano products

at present, there are no quality and safety standards for nano products in the world

: what is the safety of nano products around us

Zhao Yuliang: some imported cosmetics must contain nanoparticles, such as titanium dioxide particles in some sunscreen and iron oxide particles in lipstick. Whether the nanoparticles cause harm to human body has not been reported

: is there a unified international standard for the safety of nanoparticles

Zhao Yuliang: the European community has issued regulations requiring that the nanoparticles used in lipstick must be greater than 100 nm. However, there is no evidence that less than 100 nanometers must be harmful

at present, there are no quality and safety standards for nano products in the world. A group of experts from China National nano center have begun to formulate Chinese standards for nano products

: what aspect is our nanosafety research aimed at

Zhao Yuliang: nano scale materials will have some special physical and chemical properties that are different from conventional scale materials. Therefore, according to the toxicology database and safety evaluation results obtained from the study of conventional substances, it may not be applicable to nano substances. Many nanostructured molecules and molecular aggregates have the ability of self-assembly. Will these artificial nano molecules interfere with or destroy the normal progress of the original molecular assembly process in the life process after entering the human body. In these aspects, it is precisely what we need to strengthen research

through chemical modification, the elimination rate of nano toxicity is as high as 10million times

: at the end of July 2004, British experts proposed that all nanoparticles should be treated as dangerous goods before confirming whether they are safe. Dangerous goods! Should we continue to develop nanotechnology with such a shocking formulation

Zhao Yuliang: the development of nanotechnology will not stagnate due to human will. Therefore, what we need to do is to conduct safety research synchronously to promote its healthy development. Of course, dangerous goods is a broad concept here. All chemicals, if used improperly, are dangerous goods in a broad sense

: is there any way to eliminate the possible harm caused by Nanotechnology

Zhao Yuliang: at present, our laboratory has conducted acute toxicity tests on 16 kinds of nano powders produced in China. It was found that the smaller the particle size of some nanoparticles, the greater the toxicity. However, we found that even if the same nano material is slightly chemically modified, its toxicity will change greatly. Therefore, we are also studying ways to eliminate these negative effects

in the latest publication of nano communication, Rice University of the United States reported the first research result of eliminating the toxicity of nano materials. Through chemical modification, the elimination rate of nano toxicity is as high as 10million times, and the effect is very good

fear comes from not knowing. With the increase of understanding, the society of nanoscience is a safer technology

: so, through safety research, the harm of nanotechnology, a double-edged sword, can be eliminated

Zhao Yuliang: through the research on the safety of nanotechnology, it will not only provide guidance for the safe application of nanotechnology products, eliminate the panic caused by not knowing whether it is safe, but also help reduce the pollution caused by nano materials that already exist in our lives and benefit people

fear comes from not knowing. Now we have begun to study its safety. With the increase of understanding, nanoscience society is a safer technology

■ origin

recently, the results of a long-term epidemiological study related to atmospheric particles have attracted attention. Through the study of the relationship between epidemiological data of more than 30 European and American cities over the past 20 years and particulate pollutants in the air, The incidence rate and mortality of people are closely related to the concentration and size of atmospheric particles in the ambient air - some nanoscale particles in the air become the inducement of people's heart and lung diseases

nowadays, nanotechnology is becoming more and more common in people's lives. In the eyes of some people, "nano" seems to have become a synonym for high technology. In today's "flying nano", the problem of "nano safety" has attracted the attention of scientists, and the reports of "whether nano is harmful to health" which are frequently seen in the newspapers are more worthy of consideration

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