According to a report by the Physicist Organization Network on July 30th, American scientists have overcome the technical obstacles of making electronic equipment and solar cells from cheap, durable and non-toxic chemical materials. This means that electronic touch pads and inexpensive solar cells costing only a few dollars are closer to us. The study was published in the latest issue of the journal Nature Communications. Uvi Kotschagan, a professor of mechanical engineering at the University of Minnesota and co-author of the study, said: “The latest technology allows children in developing countries to learn using touchpads that are less than $10; the cost of home solar cells will eventually It is expected to be lower than the cost of fossil fuels." Scientists at the University of Minnesota and the National Renewable Energy Laboratory (NREL) have used special non-toxic nanoscale silicon crystals to create special inks called "electronic inks." This "electronic ink" can be used for plastic printing, making cheap electronic devices. The study's leader, Dr. Lance Weiler of the University of Minnesota Mechanical Engineering, said that the process of manufacturing electronic devices is similar to printing digital numbers on softball jerseys, but it is much more difficult than this. This type of silicon electronic ink is in use. There will be two problems in the middle. First, under normal circumstances, in order to produce "electronic ink" with a long shelf life, scientists need to use organic molecules called "ligands," but after printing, these molecules can cause harmful substances to deposit in thin films. The resulting thin film with electronic properties deteriorates and cannot be used to manufacture electronic devices. In addition, in order to increase the electrical properties of the thin film, scientists also need to use a process called "doping", adding nano-particles of germanium to it. The new method solves the above two problems. Scientists use an ionized gas, a non-thermal plasma, to create not only silicon nanocrystals but also a layer of chlorine atoms that covers the surface. This layer of chlorine atoms interacts with many widely used solvents. This means that it is no longer necessary to use ligand molecules to produce long-life silicon inks. Moreover, they also found that the silicon-imprinted film is naturally doped with a solvent, which increases the conductivity of the film by a factor of 1,000. Kotschagan said: "The latest research means that we are making a step closer to the use of non-toxic chemicals to create more pure and stable electronic ink. We hope that the latest research will benefit everyone." Liu Xia)
Geonet can be used as a kind of filling layers for stabilization, detritus separation, horizontal drainage cushion, underwater drainage constructure and slope road protection structure in building roads, railway, ports, airports, mining, hydro-power engineering projects.
1. It reinforce old asphalt concrete road surface and asphalt layer, and prevents damage ;
2. It is used for rebuilding cement concrete road surface into composite road surface and restraining reflection caused by block contraction .
3. It is used in road expansion and improvment project and crack caused by old and new combination position and uneven sedimentation ;
4. It is used in soft soil base reinforcement treatment , is favorable for soft soil water separation and concretion,restrains sedimentation effectivly,distributes stress uniformly and improve overall strength of road base;
5. It is sued for preventing contraction crack caused by new road semi-rigid base layer,and reinforces and prevents road surface crack caused by foundation crack reflection.
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