 Ja, gute Abzunung. Yes, let's share the screen. Hmm, okay, I... Is it okay? Coming, yes, the screen is there. Okay, excellent. Okay. Good, so structural super publicity from dissipation. Ja, is it fine? Yes, yes, please. Okay, okay. So, good afternoon. So, I understand now it's... It's very close to one o'clock. So I... So I will try to finish in half an hour. So, Min, my colleague just gave a talk. Min, is another one of my colleagues, Professor in Tsinghua. So, so publicity at the beginning, they defined two contact in surface, sliding with no resistance. So the definition, this depends on the commensurate. So, so the concept appears when the surface is commensurately. So, that's the beginning. So, so we will study from this to talk about some concept and then we will generalize this concept from the material to conception. So, so I will try to reveal along this line the concept. So, you know, so if we look at the bake, so we can even see from the literature, a mathematical model, shall that's when the somehow commensurate, one-dimensional, so result in the counseling, the shear resistance. So, this experiment, so did by Herano and his colleague. The shall we use the... some different from the static and the dynamics. So dynamics is somehow a little bit lower friction than the static, but they're very similar, the dependence on the mismatch angle. So between the graph, two graphene, two graphite, the frag. And then, but the result, the previous result, the friction is still too high, so it's not as expected by theory. So that's zero, nearly zero resistance. So 10 years later found, the friction can be depressed very, very low, but if it commensurate, it's all the higher. The limit is non-scale, not only non-scale, because this is a graphite and graphene attached on a nanotip. So this is not exactly a structure. It's somehow deformation, also local deformation introduced. So, at the later, so we show that with graphite, micro-scale graphite flag, the shall self-rejection behavior. So this, to understand this, the self-rejection behavior, found this so-called sobriety can achieved in micro-scale. So the major difference, this is somehow, there is a tip, but here is a structure. So this is, you can think this is a frag, the material, only material itself. So in this case, there is a tip and the pressure and so on. So this is different. So I will explain, we take this to clarify the more different. Okay. So the notion of structure sobriety, if we look at the beginning, so we can date back to the same year 2004, we assume the rigid body assumption where it is called a structure, the sobriety. It's not a supraubriety, because at the experimental, the friction is still too high. So the structure is, particularly means, is in commensurate structure. So it's a topical lattice structure. It's not like our largest scale structure. So this is somehow the lattice structure. So also, when you use this conception, is this conception somehow, so we can say this is somehow supriety, but still structure. So this structure, in the still sense, is a lattice. It's not like a larger scale, result deformation and so on. So, and then, our purpose is trying to realize somehow pure, only the material without somehow the deformation, the large deformation, the pressure of the satellite events. So we use the pure structure. Okay, so this concept. So we use the little graphy to fabricate the micro flag, and then, at the very beginning, that's very difficult, because the device, if we use atomic force, a microscopic, this is not strong to slide in, to open, to overcome the resistance. So we spend the years to make homemade proper. And then the difficulty is, in homemade, we need difficulty to measure the force. We can measure the shear, we can reduce the shear, but we can not make the force, measure the force. Then we, fortunately, at that time, there is micro nano polymerate, so we realize this observation. Okay, so I will go on. So the key problem at that time, so if we want to have some, the real neo world education, so the key problem, so we should understand what's the nature of the structural, the real structural conduct, not the deformation, like through the tip. And then should understand where is the friction come from. And also, we should categorize the energy dissipation, the why happens. And finally, we want to understand why the material decorations so well, because supposedly my come in with zero way. So we should also understand why there is wear, what's the limit. So then we spend years. So previously there is no normal force. And we understand if the pressure, the normal force is not as sufficient high, there might be man without wear. There is several research on this aspect. But we want to understand why the wear would appear and initiate the wear and found the critical pressure. Then we meet the difficulty that we invented another device to realize the very high pressure. So actually we realized the maximum normal load remind zero wear is 6 GB. So very, very high. And we also realized very long sliding 100 km without wear. And then and we also found observed the lowest friction coefficients wear it all and the high speed and then the one dimensional size and the maximum counter area and now we can achieve a larger and still we don't know why we need to achieve even larger. So that's the technically we still in this range. And then we also generate from the 2D material and another 2D laser material into 2D material and 3D material diamond DLC like other 3D material and they realize in different environment so the temperature and so on. To understand what's the nature of structural superiority we invented technology how to open the real contact. So we observed if the graphite graphite 2 layers the surface only happens the real contact 2 layers the upper and the lower that should be somehow perfect single crystalline graphene. So if the top surface or the lower surface the bottom surface contains steps then the friction will be much much higher but if the steps is under the top the single crystalline graphene then they will fail into the superiority range so that's the mechanism that means for the graphite flag necessary condition to achieve superiority should the single crystalline graphite the whole area. So we found and then so we still found also is still micro meters so we also to check the contribution the real contact area and the age and then we found the inner area the friction is virtually friction is and then around the age the per etern the friction is somehow 4 to 5 orders higher than the inner area so with this so we can have an estimation so its size is smaller than like diameter less than 10 micro meters the age will dominate the friction so only the very large the real contact area the friction will be somehow the larger contributor so that's why so we we should have micro micro meter scale maybe not the larger many others I mean the deformation so I will not mention this but so this is one of the reason we chose micro meter and then another topic we found and then after fabrication of this of graphite the first sliding they meet big resistance so so for the first shear the cleavage force from this number 4 so they will increase very very high like this we are very high they have a certain job the second certain job and then we after when release there will rejection bake and the rejection bake and then we try to also reduce the orders so this we should understand why this age and the why still somehow the friction so we did experiments to show we found temperature can reduce in this case I mean after openly then this friction we can so the temperature we can reduce somehow 20 percent at least 20 percent sometimes somehow near 100 percent I mean so the temperature we can reduce almost the friction zero and then very recently we found was the real the origin of the friction so this is very recently found this is actually during the fabrication around the age there is a range such like 30 nanometers in this range in the inner area all the somehow perfect graphene graphite layer but at the age the creative area this is non-crystal somehow somehow diamond ok so this is actually because the fabrication really doesn't around the age so the content between the sliding the upper and the lower along the age they will somehow like a DLC so this is why technically the friction origin around the age so this is to us for the technical point of view this is the breakthrough in the future we can fabricate without such age for instance this is very recently we introduced deformation so to result in somehow because this only this age around the age somehow non-crystal area so we can introduce permanent deformation only in the area they will reduce 2 orders of friction because this result area so this is my very application so so this has somehow proof so you so so so so so so so so so so so so so so so so so so so so so so so so so so so So, dann, dann, und dann, we also, without a, without, if without the age, without in commensurate we use two, two, two heterogeneous 2D material. Und the mechanism, if without in commensurate effect, and that the major contribution was input, the, the, of the, the plan of deformation is major contribution. Dann, durch diese Veranstaltung, haben wir es gefunden. Dieses Result war der Anfang. Ich war in diesem Bereich im Jahr 2002. Und dann haben wir es gefunden, dass es eine große Mechanik ist. Es ist nicht nur ein Autoplan, aber auch eine spezielle, vorhandensteht. Wenn die Speed durch die Lattice, dann gibt es die Lattice, die durch die Lattice, diese Resolvenz, die sehr hohe Energiedissipation ist. Man kann sehen, dass es keine Energiedissipation ist. Das hat es sicherlich. Wenn man eine bestimmte Speed hat, dann hat man in einem bestimmten Bereich eine bestimmte Resolvenz. Es gibt eine große Mechanik in der Struktur. Die Resolvenz wird auch im Faktor. Okay. Und wenn man die 2D-Material-Contact fügt, dann hat man die Estimation, die Moral-Type, und die Moral-Ring, die Kontribution. Aber all of those, if the size is limited to a micro scale, those contributions are somehow ignored. So my conclusion is that if we limited to the micro scale, then the friction, major from the age, the inner area you can ignore. So that's from both theoretical and also experimental research, the observation. So, so, because if the inner area without all the friction is actually wrong, why the wear appear, then we believe this, the zero wear will be a unique property of the structural velocity. So we did experiments. The test is 100 km, nowhere, and the speed is 2 m per second, so very high speed, still nowhere. So this is the proof. And then very recently, we did experimental work and also theoretical work to try to understand why the structural velocity, there will be no, there will be zero wear. So we studied, was the critical pressure, the normal pressure, that will generate the wear. Then we concluded that the wear can only actuate with the inter-layer chemical bounds. If there will be no inter-layer current bounds, there will be no wear, zero wear. So we found interestingly in this the wear appear almost immediately after the form of the chemical bounds, then rapidly the chemical bounds will result in the defects, larger and larger defects. So we can, recently we can define the critical force that initiate chemical bounds, there will be the critical pressure of the wear. So we did experiments. So this, we spent somehow two years, more than two years because the pressure is very, very high. So we invent another the loading device so to achieve very, very unique, uniform, the pressure, not a high concentrated force. Then we achieved this critical pressure. So that means that we found for graphene, for graphite and graphite the structural supersonic is still robust so such high pressure. But for graphite and the 3D material somehow put them lower. So such high critical pressure is very, very high. So this pressure is even higher than the material so so for many times the pressure is lower than this critical pressure. So this means the structural supersonicity zero wear property is a very stable and robust property so for many, many materials so this is very exciting property. So this this is at the very beginning is only as a guess it's not an experiment 2016 I and my colleague review article, we suppose this is possible, zero wear is possible so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so so