According to the report of the Physicist Organization Network on April 3rd, in order to obtain catalysts in fuel cells and electrodes in ordinary batteries, engineers hope to make porous metal films, strive for a larger surface area for chemical reactions and maintain High conductivity. The latter has always been a frustrating challenge. Now Cornell University has developed a new method that can increase the conductivity of porous metal films by a factor of 1,000. This technology also opens the door to making a variety of metal nanostructures that can be applied in engineering and medicine. The relevant research report was published in the recently published online edition of Nature Materials magazine. Ulich Weissner, a professor of materials science and engineering at Cornell University, said that they have achieved a high level of control over the composition, nanostructure, and electrical conductivity of the resulting materials by means of hybrid heating. The new method is based on the sol-gel method familiar to the academic community. By mixing certain silicon compounds and solvents, it can self-assemble a silica structure containing nano-scale honeycomb pores. The challenge for researchers is to add metal to create a conductive porous structure. Scott Warren, the first author of the paper and currently a researcher at Northwestern University in the United States, explained that in previous experiments, they found that adding a small amount of metal would destroy the process of forming a gel. Because one end of the amino acid molecule is attractive to silicon and the other end is attractive to metals, researchers have the idea of ​​using amino acids to attach metal atoms to silicon atoms, which can prevent the disruption of the self-assembly process of metal thin films caused by phase separation. . Based on the above methods, more metal and silicon carbon nanostructures can be produced and their electrical conductivity can be greatly improved. Silicon and carbon can be removed leaving only a metallic porous structure. However, the silicon-metal structure can maintain its own shape even at high temperatures, which is very beneficial for manufacturing fuel cells. Warren also said that removing only silicon to leave the carbon-metal complex provides other possibilities, including the formation of larger holes. The experimental report shows that the new method can be used to produce a variety of materials with a high level of control over composition and structure. The research team has created a structure for almost every metal in the periodic table, and with other chemical processes, the pore size can reach 10 nanometers to 500 nanometers. They also manufacture metal-filled silicon nanoparticles that are small enough to be ingested and absorbed by humans, which is expected to be used in biomedical applications. In addition, Weisner's team is also known for producing "Cornell dots", which can encapsulate dyes in silicon nanoparticles, so the sol-gel process can also be applied in the construction of solar cells containing photosensitizing dyes. (Zhang Hao Responsibility Editor: Peng Jinmei) Tub Mat,Anti-Slip Bath Mat,Rub Mat Shenzhou Yuye Housewares Co., Ltd. , http://www.fscurtainrod.com