The symbol of the international system of units is nm. 1 nanometer = 10 minus 9 meters, and the unit of length is the unit of measurement of length, just like centimeters, decimeters and meters. 1 nm is four times the size of an atom, which is much smaller than the length of a single bacterium. The international common name is nanometer, abbreviated as nm.
A single bacterium is invisible to the naked eye, and the diameter measured by microscope is about five microns. Suppose that a hair has a diameter of 0.05 mm and is cut into 50,000 pieces on average along the axial direction, and the thickness of each piece is about 1nm. In other words, 1 nm is 0.00000 1 mm. Nanoscience and technology, sometimes called nanotechnology, is to study the properties and applications of materials with structural dimensions ranging from1to 100 nm.
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198 1 year, scientists invented the scanning tunneling microscope, which is an important tool for studying nano, from which we can see the atomic and molecular worlds.
From 65438 to 0990, the first international nanotechnology conference was held in Baltimore, USA, and the form of nanotechnology was born.
199 1 year, carbon nanotubes were discovered by humans. Its mass is one-sixth of that of steel with the same volume, but its strength is 10 times that of iron, which has become the focus of nanotechnology research.
After 1989 Stanford University wrote the English name of Stanford University by moving atomic groups, and 1999 IBM used 36 xenon atoms to expel "IBM" from the nickel surface, the Beijing Vacuum Physics Laboratory of China Academy of Sciences successfully wrote the word "China" by manipulating atoms.
1997, American scientists successfully moved a single electron for the first time. This technology can be used to develop quantum computers with thousands of times higher speed and storage capacity than now. In the same year, new york University discovered that DNA can be used to manufacture nano-scale mechanical devices.
1999, Brazilian and American scientists invented the world's smallest "scale" when conducting carbon nanotube experiments, and its weight can reach one billionth of a gram, which is equivalent to the weight of a virus; Shortly thereafter, German scientists developed a "scale" that can weigh a single atom, breaking the record jointly created by American and Brazilian scientists.
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