In a new issue of Science in the World, the research group of assistant professor of Chinese scientists at the University of Houston in the United States, Yu Cunjiang, reported that they made new breakthroughs in flexible stretchable electronics and developed stretchable rubber semiconductors and conductor materials. Use these materials to make full rubber transistors, sensors and robotic skin.
In a telephone interview with Xinhua News Agency on the 9th, Yu Cunjiang said that flexible stretchable electrons have broad application prospects in fields such as health monitoring, medical implantation, man-made skin and human-computer interaction. However, the current electronic materials, especially semi-conductor materials, Therefore, people mainly achieve the purpose of stretching, such as folds, serpentines or springs, by designing special structures of these materials. However, these methods have the disadvantages of complicated technology, poor structural reliability and high manufacturing cost.
Yu Cunjiang task force instead of the material itself, work hard to design and prepare based on semiconductor nanofibers and silicone rubber composite rubber semiconductor materials. These rubber semiconductors not only have excellent mechanical stretchability, but also have good electrical properties of the semiconductor can be stretched 50% of the normal work. In addition, they also developed another composite material preparation method, using gold, silver and other metal and rubber materials can be drawn to stretch rubber gold, rubber silver and other rubber conductor materials.
The use of these rubber electronic materials, the group successfully made all-rubber transistor and the whole rubber temperature, pressure and other sensors. All rubber transistors can also be 50% of the work under tension in the normal work, a variety of sensors also have good sensing performance.
The research group also successfully used these rubber electronic devices to make the robot skin, and realized the robot hand sensing environment and the function of translating the speech gesture.
Yu Cunjiang said: "In general, all rubber electronic devices inherit the mechanical properties of rubber materials, not only has excellent tensile ductility, good electrical properties and high structural reliability, but also has a simple production process, suitable for large-scale Manufacturing, low cost advantages.It is foreseeable that all rubber electronics will promote the technological innovation of a new generation of flexible electronics. "
A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting medium.
The basic hoist has two important characteristics to define it: Lifting medium and power type. The lifting medium is either wire rope, wrapped around a drum, or load-chain, raised by a pulley with a special profile to engage the chain. The power can be provided by different means. Common means are hydraulics, electrical and air driven motors. Both the wire rope hoist and chain hoist have been in common use since the 1800s, however mass production of an Electric Hoist did not start until the early 1900s and was first adapted by Germany. A hoist can be built as one integral-package unit, designed for cost-effective purchasing and moderate use, or it can be built as a built-up custom unit, designed for durability and performance. The built-up hoist will be much more expensive, but will also be easier to repair and more durable. Package units were once regarded as being designed for light to moderate usage, but since the 60s this has changed. Built-up units are designed for heavy to severe service, but over the years that market has decreased in size since the advent of the more durable packaged hoist. A machine shop or fabricating shop will use an integral-package hoist, while a Steel Mill or NASA would use a built-up unit to meet durability, performance, and repairability requirements. NASA has also seen a change in the use of package hoists. The NASA Astronaut training pool, for example, utilizes cranes with packaged hoists.
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