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China News Service, San Francisco, August 17th Chinese American scholars recently invented an organic semiconductor material, which is a new discovery in the study of flexible and thin materials. This material is characterized by its high conductivity, softness and durability, and is expected to promote the development of lightweight and easily foldable electronic products.
Bao Zhenan, an associate professor of chemical engineering at Stanford University, has been developing new materials using chemical knowledge and methods. She has invented soft and sensitive artificial electronic skin and stretchable solar cells.
Bao Zhenan said in an interview with a reporter from the China News Service that the inorganic materials used in electronic products, such as silicon, have the advantages of fast and strong electrical conductivity, but they are bulky, heavy, and easily broken. The use of personal electronic products is becoming more and more common, and finding alternative materials is imperative. The newly invented organic semiconductor material has high conductivity, good flexibility, and is light and durable. It can be used for televisions and computer displays, electronic circuits, and the like.
This new type of organic semiconductor material is the result of cooperation between Stanford and Harvard. “I came to Harvard academic exchange two years ago and met Alan Aspgu Guzko, an associate professor of chemistry and chemistry biology. We were so similar to the idea of ​​finding and manufacturing new materials, so we started cooperation.†Bao Zheonan said.
Baozhan Nan used the latest theoretical calculation methods already completed by Harvard scholars as guidance, and the research team spent only half a year synthesizing this organic new material with good electrical conductivity in the laboratory. This process of discovery, which often requires several years shorten.
Compared with amorphous silicon, which is the main material for the production of LCD TVs and computer screens, this new material has a conduction speed 30 times that of amorphous silicon. Bao Zhe Nan said that it will take some time before it is actually used. Although its conductivity is very good, its solubility is still not ideal and needs further study and improvement. "I hope that in the future, we can combine with the way that the industry manufactures products and make it in a non-vacuum environment. For example, it can be made into soluble ink and printed in large areas."
Bao Zhenan from Nanjing University in China obtained a Ph.D. in Chemistry from the University of Chicago. He successively worked at Bell Labs and Lucent Technologies, and taught at Stanford University in 2004. Her research on new materials for organic semiconductors was funded by various organizations such as Stanford University's International Climate and Energy Program. "We look forward to finding high-performance solar cells in the same way."
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Used for processing flat surfaces on horizontal milling machines. Cutter teeth are distributed on the circumference of the milling cutter, and are divided into straight teeth and spiral teeth according to tooth shape. According to the number of teeth and coarse teeth and two kinds of fine teeth. The helical tooth rough tooth milling cutter has fewer teeth, high tooth strength and large chip space, which is suitable for rough machining. Fine-tooth milling cutters are suitable for finishing.
2. face milling cutter
Also known as disc milling cutter, used for vertical milling machine, end milling machine or gantry milling machine processing plane, end face and circumference have cutter teeth, also have coarse teeth and fine teeth. The structure has three kinds: integral type, insert type and transferable type.
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Used for processing grooves and step surface, knife teeth in the circumference and end face, can not work along the axial feed. When the end mill has end teeth through the center, axial feed can be provided.
4. Three-side edge milling cutter
Used for processing all kinds of grooves and steps, its two sides and circumference are provided with cutter teeth.
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For milling grooves at a certain Angle, there are two kinds of single Angle and double Angle milling cutters.
6.Saw Blade milling cutter
Used for machining deep grooves and cutting off workpieces, there are more cutter teeth on the circumference. In order to reduce the friction during milling, there are 15 '~1° auxiliary Angle on both sides of the cutter teeth. In addition, there are keyway milling cutters, dovetail slot milling cutters, T - shaped slot milling cutters and various forms of milling cutters.
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