Nano-diamond anti-friction agent (1)--Li Yunpeng

In fact, I seldom touch on the topic of "nanomaterials". Firstly, the talents are sparsely learned, the concept of nanometer is like a cloud mist to me, I still can't get the essentials; secondly, nanomaterials are still a new interdisciplinary subject at present. In the rapid development, lubricants, as a technical field with extremely application characteristics, seem to lag behind in my opinion. I would like to observe the application signs effects of nanomaterials, it will be too late. Nowadays, some of my classmates are engaged in nano-based basic research, industry colleagues often mention nano-lubricants, haha, avoid it. Dare to talk about the superficial views on nano lubricating materials.

 The so-called nanomaterials have a nanometer size structure of 1-100nm. It is precisely because of this structure that it has the particularity between a single molecule a bulk material. In recent years, people's research on nanomaterials has penetrated into many fields. Because of its special structure, properties broad application prospects, it has attracted more more attention. The reason why nano-materials exhibit these strange properties is mainly due to the fact that after the material enters the nano-scale, it shows some physical effects that macro-materials do possess can be ignored in macro-materials. According to the current research on nanoparticles, these effects mainly include surface effects, quantum size effects, small size effects, macroscopic quantum tunneling effects.

 ①Surface effect: The proportion of surface atoms of nano-scale structure increases sharply as the size of nano-structure decreases. This can be concluded by imagination. This kind of surface effect is called the surface effect, which is caused by the sharp increase in the proportion of surface atoms as the size of the nanostructure decreases. The size of the nano-scale structure decreases, the number of surface atoms increases sharply, the specific surface area surface binding energy increase rapidly. Due to the increase in the number of surface atoms the insufficient coordination of the atoms, there are bound to be many defects on the surface of the nanostructures, which make these surfaces highly active, that is, extremely unstable, are easily combined with other atoms. This atomic activity only causes changes in surface atomic transport configuration, but also changes in surface electron spin configuration electronic energy spectrum, which has important effects on the optics, photochemistry, electricity of nanomaterials. In practical applications, it is sometimes necessary to confine the nanostructures to passivate these surface atoms, eliminate the surface state modify the surface of the nanostructures to achieve their novel physical chemical properties. It is conceivable that the physics chemistry of lubricants is an important branch of interface science. Before nanotechnology, the so-called surface adsorption detachment of lubrication friction, the existence of surface films have become so complicated. If you add nanomaterials This kind of surface effect, lubrication technology, when more colorful.

 

   Table Particle size, number of atoms, proportion of surface atoms

Author: Li Yunpeng, Research Institute of Petrochemical Sciences, professor, senior engineer, graduate tutor, joined the Academy of Petroleum Sciences after graduating Nankai University in 1987, engaged in the research development of lubricants additives for nearly 30 years, published papers in academic journals at home abroad More than 70 articles, 15 invention patents, the leading research development products won the ministerial first prize of science technology once, several other awards.