Bearing never wear, likely!
In the experiment, the researchers observed, can slide relatively fast between carbon nanotubes inside and outside wall centimeter level length, and measurement of ultra low friction between pipe wall, which proved that the super lubricating phenomenon. Interestingly, it doesn't matter the friction force and the length of the carbon nanotubes, namely, no matter how long the carbon nanotubes, the inner layer can be easily pulled out.
It is worth mentioning that, they also found, load some nano flake structure in the outer wall carbon nanotube ends of fracture, can naturally form a "mini mills", gently blowing in one breath, can operate at high speed, it also indirectly proved that the super lubricating phenomenon.
Professor Michael Urbakh of world famous experts, Tel Aviv University in Israel that friction theory, this work "with its milepost type novel discovery, definitely proved that macro scale super lubrication are, no doubt, this is the first time observed from micro friction so low to the macro scale."
Wei Fei said: "we can provide the ideal model of lubrication, other materials as long as it meets the conditions, can also realize the lubrication, have a brilliant future in the field of nano devices."
Recently, the research team led by Tsinghua University professor Wei Fei announced: the first in the world to detect super lubrication phenomena in macro scale in atmospheric environment, which has brought a ray of hope -- materials and devices once the manufacture lubrication for human future to overcome the friction phenomenon, a once and never stop the machine table, never wear of bearing not far away.
Data shows, the one-time energy around the world about 1/3 to 1/2 are being consumed in the process of friction, industrial developed countries due to friction, wear loss accounted for 5% of GDP to 7%. In the micro nano scale materials per unit surface area, with the volume of the interface friction increases rapidly, has become the key factor in restricting device performance and life. Bearing enterprises
To solve the problem of friction, wear the "prescription" is to achieve super lubrication. The existence of super lubricating really? Over the past 20 years, many scientific experiments proved, it is only in the micro nano scale special, and most under ultra high vacuum condition can be achieved, but this is far from the practical application. Scientists once thought, super lubrication is almost impossible at the macroscopic scale.
In 10 years, done a lot of research Wei Fei led the team in carbon nanotubes. They found that, the relative sliding can occur large scale carbon nanotubes between two adjacent layers of the wall, this is the ideal material for super lubrication. Then, experiments carried out their joint Tsinghua University nano science and innovation research center and the Peking University School of information.
The researchers produced the first known as the "perfect" carbon nanotubes, and prove that carbon nanotubes without any defect in the range up to several centimeters in. However, the diameter of the carbon nanotubes is only several nanometers, about 1/10000 of the hair, the length can reach several centimeters, to accurately measure the relative motion between the inner tube and outer tube is very difficult. The research team designed a novel marker method, they load a lot of titanium dioxide nano particles on the surface of carbon nanotubes, the particle scattering of visible light, the distance change between the observations of these nanoparticles, can obtain relative sliding between carbon nanotubes and information management.