"One nanometer is only equivalent to one-thousandth of the thickness of hair filaments. Based on our research, the preparation process of metastable nanomaterials has become simpler, more environmentally friendly and cheaper, and will be beneficial to the preparation of various novel nanomaterials. It is applied to people's lives. For example, using nanomaterials to make solar cells has higher conversion efficiency and lower cost, which is a revolution in new materials and new energy sources.†Associate Dean, School of Physics and Engineering, Sun Yat-Sen University Professor Yang Guowei, director of the Nanotechnology Research Center, talked about the study and could not restrain the excitement. The team led by him won the second prize of the National Natural Science Award in 2011 for his “Basic Research on the Growth of Nanostable Nanomaterials.†A Wishful Wish to Produce Cheap and Environmentally-Friendly Metastable Nanomaterials Due to the particularity of the metastable material structure, it has superior properties to the stable phase material. However, the traditional preparation method requires high temperature, high pressure, and large-scale and expensive machinery and equipment, the process is complicated, the cost is high, and the environmental pollution is large. Sometimes genius appears by chance. Yang Guowei introduced that the discovery process of this experimental method was very interesting: At that time, he and everyone else did the laser ablation reaction under vacuum environment. They ordered the pulsed laser first and the reaction chamber had not arrived yet. Yang Guowei was waiting. Other experimental methods are envisaged. He whimper: Can you place the entire reaction system in water? The result is amazing. They found that extending the laser ablation system to a liquid environment would generate many physical and chemical phenomena that could not be achieved in a vacuum or gas phase environment and could be used to prepare novel metastable nanomaterials. At that time, only a few international research groups were doing the research, including Yang Guowei's team. Therefore, they are called by the international counterparts as one of the main pioneers of this research. This method greatly promotes the use of metastable nanomaterials, making the preparation process very simple and inexpensive, green, and environmentally friendly. For example, in the conventional diamond preparation, a large press is used to treat the graphite powder at a high temperature and a high pressure. Using this new method, a pencil lead is placed under water at room temperature and pressure, and it is ablated with a pulsed laser to obtain high-quality diamond nanocrystals in a small beaker. This novel preparation method, besides being applied to the field of photoelectric materials, can also be used in an environmental field closely related to people's life. Using this technology, a colloidal purifying agent that can repair contaminated soil has been prepared abroad. This is very valuable for the Pearl River Delta, which is polluted by heavy metals. Provides "menu-style" guidance to provide a theoretical basis for exploring novel metastable nanomaterials "The purpose of materials science research is to make useful materials for humans. But how to prepare? Theoretical studies of materials science must give guidance and scientific prediction." Yang Guowei said. He and Wang Chengxin, Ouyang Gang, Yang Yuhua, Wang Bing and other team members insisted on more than ten years of research, and established the universal thermodynamic theory of nano-nuclear nucleation, growth and phase transition, namely nano thermodynamic theory and continuous The theory of surface and interfacial energies of nanomaterials systems of media mechanics and nanothermodynamics predicts a series of exotic nanoscale effects. In addition to clarifying some of the controversial fundamental issues in the preparation of metastable nanomaterials, these theories have also been applied to the theoretical design of growth of metastable nanomaterials. Metastable nanomaterials provide the theoretical basis. Therefore, these theoretical studies have not only increased people's new knowledge about nanomaterials, but more importantly they have opened a door to explore the application of nanomaterials. “The cooking of the so-called 'fried vegetables' method is just like cooking. The chef mixes and matches the raw materials according to the existing menus. The researchers prepare materials, and more often do “mix and match†based on existing research experience. Yang Guowei explained, "If you want to make new dishes, then you need the chef to study and design new menus based on experience. The same applies to new material research, and it also requires theoretical and methodological guidance. The prediction of theoretical methods is not necessarily accurate." But it can provide experimental scientists with menu-like instructions and references." In addition, Yang Guowei's team has also prepared a variety of forms of one-dimensional oxide nanostructures, and discovered many novel physical properties and potential applications. "If this discipline is applied for research, it will continue to develop for a decade or two, people will increasingly appear in the life of devices and articles made of nanomaterials." Although the non-application research is done, but Yang Guowei predicts The future of nanomaterials. We are willing to learn and accumulate at different stages of the "cold bench". Yang Guowei and his students are willing to “sit on the bench†and concentrate on basic research while focusing on the atmosphere of applied technology. He thinks, "In the course of research, if you can't make new stuff yourself and you can't send an article, you may want to give up. But on a global scale, the discipline is still developing. If others can continue, you can't give up. Now The classification of disciplines is becoming more and more detailed, and in different time periods, it is normal for the different disciplines to be popular and alternate. “When I was young, I had been looking for my real interest for a long time.†Yang Guowei graduated from the university, once worked in the factory, and then went to university to pursue post-graduate studies in semiconductor materials. After graduating, he worked in military research institutes, then went to Tsinghua University to pursue a doctoral degree, went to the United States to do post-doctoral research, and so on. These complicated experiences have intangible benefits for him after he returned to China to study at Sun Yat-sen University, broadening his horizons and accumulating experience. "Staying different careers is trying to see what careers are more suitable for you and choosing the academic research that is most interesting. If you are a thoughtful person, then learning and accumulation at different stages will be beneficial to you and will be for future development. It helps a lot." He explained that he likes to do basic and independent academic research. He has a more ambience in a university environment that promotes academic freedom. Continual interest is his motivation. His family is also very supportive of his continued research. Do not use scientific research as a task to cultivate the “feeling†of scientific research anytime, anywhere. In China, job evaluation is a great pressure for scientists in basic research. In developed countries such as the United States and Japan, even if these quantitative assessment targets cannot be achieved, sufficient research funding and recognition can be obtained. Yang Guowei believes that researchers need to have independent ideas and proper progress, and cannot simply pursue research speed and number of papers. However, he is optimistic about the development trend of China's scientific research management. Not everyone can sit on the bench, let alone concentrate on basic research for more than a decade. Yang Guowei made three demands on the students in the research group. First of all, if you are interested in the research you are doing, you will be truly happy and excited about any small progress in the research, not just the scientific research. Second, he asked students to cultivate their own sensitivity to scientific research anytime and anywhere. This is the "feeling" of scientific research. In connection with his own experience, he believes that “opportunities are always in sight. Whether or not you can seize it depends on whether you can feel it.†Finally, he stressed that it is necessary to cultivate its “grade†of scientific research. Why use the word "grade"? Yang Guowei said that in the same research field, everyone's style and concern are not the same. When peers evaluate your research results, besides being high quality and meaningful, there is something unique about you that is your “gradeâ€. Because he has a real interest in the research he is engaged in, he always struggles to solve problems when he encounters difficulties in his research. Even in my spare time, I can't put my head in my head. (Reporter Lei Yu intern Fang Zeyi correspondent Wang Lixia) Other Night Light,Projector Nightlight For Star Sky ,Led Emergency Light,Night Light For Moon Sky NINGBO ZHENGUO INTELLINGENT LIGHTING CO.,LTD , https://www.zguolight.com