Some people say that graphene superconductivity has been developed at room temperature, and the world's first UHV transmission technology, which we are proud of, will no longer exist. Is it true? Is it really possible to superconduct graphene at room temperature? When you think of graphene, you probably think of the black stuff that costs a few dollars a bottle. But it's not really graphene, it's its oxide, which isn't very valuable. Graphene, which can actually be used to transmit electricity, costs about 4,000 yuan per gram.
So what is graphene? In simple terms, it's a new material with carbon atoms arranged in hexagons that look like a honeycomb. It exists as a single layer, but getting natural graphene out of a single layer is so difficult that graphene is expensive. So what is superconductivity? Superconductivity is simply zero resistance, but the realization of zero resistance, but needs a variety of strict conditions.
When the current is transported, because the transmission materials cannot perfectly achieve superconductivity, such as copper and iron, it will cause a variety of resistance and cause the loss of energy 39bet-đua chó-game giải trí -đá gà-đá gà trực tuyến-đánh bài. Zero resistance, that is, no energy loss, 100% current transmission. So is graphene superconducting possible? Yes, but the conditions are strict. So far the most famous implementation of graphene superconductivity, there are two. One is the masterpiece of our Cao Yuan. A devil's horn was formed at minus 271 degrees Celsius, allowing graphene to superconduct. Here friends may ask, what is the devil's horn? Essentially, you twist two layers of graphene by 1.1 degrees to make it look like an angle.
And the other is a masterpiece from abroad, which can be found in nature. To put it simply, graphene formed under special pressure superconducts. Compared with Caoyuan's temperature of more than -270 degrees Celsius, the real realization of room temperature superconductivity experiment. Room temperature is our normal temperature. But this method has a huge disadvantage, that is, the pressure is too high.
The test was conducted at 207GPa, a pressure at which no human could survive. In nature, except in the deep ocean, there is almost no such pressure. So this research is still in the laboratory, and we don't know how many years it will take to popularize it.
So the first thing this solves is the pressure problem. So if we really want to use graphene superconductivity in power transmission, we not only need to control the temperature conditions of this technology under our normal room temperature conditions, but also need to solve the problem of pressure to achieve room temperature superconductivity.
If you want to be superconducting in detail, there are three requirements. One is the critical transition temperature, one is the critical magnetic field strength, and one is the critical current density. In other words, the realization of superconductivity must meet all three conditions at the same time. The so-called critical transition temperature is the temperature at which the superconductor reaches zero resistance. By analogy, the critical magnetic field strength is the applied magnetic field strength when the superconductor reaches zero resistance. The critical current is the upper limit of the current at which a superconductor can be superconducting. But under current conditions, trying to do all three would be like heaven.
One of the most difficult to solve is the current critical problem. If we want to use graphene superconductivity in power transmission, it is natural to ensure the transmission power, but under the condition of guaranteeing the transmission power, the current intensity through the superconductor will be increased. Once you go above that limit, the superconductor stops conducting.
Therefore, it is not feasible for graphene superconductivity to replace high-voltage power transmission. The main problems are: first, the superconducting condition cannot be met, and second, the cost is too high.