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Yahoo! My Yahoo! Mail More Yahoo! Services Account Options New User? Sign Up Sign In Help Yahoo! Search web search Home Singapore Asia Pacific World Business Entertainment Sports Technology Robotics breakthrough: Scientists make artificial skin AFP - Monday, September 13 Send IM Story Print Robotics breakthrough: Scientists make artificial skin PARIS (AFP) - – Biotech wizards have engineered electronic skin that can sense touch, in a major step towards next-generation robotics and prosthetic limbs. The lab-tested material responds to almost the same pressures as human skin and with the same speed, they reported in the British journal Nature Materials. Important hurdles remain but the exploit is an advance towards replacing today's clumsy robots and artificial arms with smarter, touch-sensitive upgrades, they believe. "Humans generally know how to hold a fragile egg without breaking it," said Ali Javey, an associate professor of computer sciences at the University of California at Berkeley, who led one of the research teams. "If we ever wanted a robot that could unload the dishes, for instance, we'd want to make sure it doesn't break the wine glasses in the process. But we'd also want the robot to grip the stock pot without dropping it." The "e-skin" made by Javey's team comprises a matrix of nanowires made of germanium and silicon rolled onto a sticky polyimide film. The team then laid nano-scale transistors on top, followed by a flexible, pressure-sensitive rubber. The prototype, measuring 49 square centimetres (7.6 square inches), can detect pressure ranging from 0 to 15 kilopascals, comparable to the force used for such daily activities as typing on a keyboard or holding an object. A different approach was taken by a team led by Zhenan Bao, a Chinese-born associate professor at Stanford University in California who has gained a reputation as one of the top women chemists in the United States. Their approach was to use a rubber film that changes thickness due to pressure, and employs capacitors, integrated into the material, to measure the difference. It cannot be stretched, though. "Our response time is comparable with human skin, it's very, very fast, within milliseconds, or thousandths of a second," Bao told AFP. "That means in real terms that we can feel the pressure instantaneously." The achievements are "important milestones" in artificial intelligence, commented John Boland, a nanoscientist at Trinity College Dublin, Ireland, who hailed in particular the use of low-cost processing components. In the search to substitute the human senses with electronics, good substitutes now exist for sight and sound, but lag for smell and taste. Touch, though, is widely acknowledged to be the biggest obstacle. Even routine daily actions, such as brushing one's teeth, turning the pages of a newspaper or dressing a small child would easily defeat today's robots. Bao added important caveats about the challenges ahead. One is about improving the new sensors. They respond to constant pressure, whereas in human skin more complex sensations are possible. This is because the pressure-sensing cells in the skin can send different frequencies of signal -- for instance, when we feel something painful or sharp, the frequency increases, alerting us to the threat. In addition, Bao warned, "connecting the artificial skin with the human nerve system will be a very challenging task". "Ultimately, in the very distant future, we would like to make a skin which performs really like human skin and to be able to connect it to nerve cells on the arm and thus restore sensation. "Initially, the prototype that we envision would be more like a handheld device, or maybe a device that connects to other parts of the body that have skin sensation. "The device would generate a pulse that would stimulate other parts of the skin, giving the kind of signal 'my (artificial) hand is touching something', for instance." In the future, artificial skin could be studded with sensors that respond to chemicals, biological agents, temperature, humidity, radioactivity or pollutants. "This would be especially useful in applications where we want to send robots into environments, including space, where it could be dangerous for humans to go," said Bao. "They could collect information and send it back." Recommend Send IM Story Print Related Articles Mobile phone users enlist YouMail "digital secretary" AFP - 20 minutes ago Robotics breakthrough: Scientists make artificial skin AFP - Monday, September 13 US-TECH Summary Reuters - Monday, September 13 Artificial "skin" materials can sense pressure Reuters - Monday, September 13 England cricket bosses to crack down on tweeters AFP - Monday, September 13 News Search Top Stories Greece fears renewed fuel shortage Mosque retreat will feed extremism, warns NY imam Greek PM rules out any restructuring of national debt French New Wave film director Claude Chabrol dies at 80 Central bankers reach deal on new bank regulations More Top Stories » ADVERTISEMENT Most Popular Most Viewed Most Recommended US pastor puts Koran-burning on hold Doomsday warnings of US apocalypse gain ground Ceremonies in NY, Washington mark 9/11 anniversary Barclays chief hits back at 'casino banker' critics Kim Clijsters defends US Open title More Most Viewed » Climate: New study slashes estimate of icecap loss Earth's upper atmosphere shrinking, scientists say Tiger's ex breaks her silence on sex scandal US pastor puts Koran-burning on hold Japanese rider Tomizawa dies in San Marino Moto2 GP More Most Recommended » Elsewhere on Yahoo! 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