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Design News, March 2013

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for natural convection cooling by air, then you're in for trouble." Cairns said that he hadn't personally seen the Boeing battery pack, however, and didn't know if Boeing engineers had provided any means for the heat to escape. Battery experts who spoke to Design News repeatedly stressed the fact that all types of lithium-ion batteries can be safe and successful, if engineered properly. The question still being answered is whether Boeing engineers did that. "They should have stress-tested the battery with charging system as is installed in the 787," Sadoway said. "I myself wouldn't fly in a 787 at this point." — Charles Murray, Senior Technical Editor, Electronics & Test For More Information: Lithium-Ion Batteries Emerge as Possible Culprit in Dreamliner Incidents: http://dn.hotims.com/45104-507 Materials & Assembly Drop Your Phone in the Sink – We Dare You How great it would be if consumer electronics like smartphones and tablets were rougher and tougher? what if you could actually drop your smartphone into the sink by accident, or into your plate of spaghetti sauce, and no harm would be done? A nanoscale coating that's now being applied to some smartphones will let you do that (though we don't recommend it). Aridion, developed by P2i, is used by Motorola on its RAZR and XOOM phones, and by Alcatel on its One Touch phones. About 30nm thick, or 1,000 times as thin as a human hair, the hydrophobic polymer coating is applied to completed products at the end of the manufacturing process. It coats exterior surfaces, ports, and even interior components, protecting them against liquids and stains, according to P2i. The coating, based on perfluorinated carbon compounds, is applied via a plasma-enhanced vapor deposition process that lays it down on all of the device's internal and external surfaces. The process takes place under low pressure in a vacuum chamber at room temperature. Anaheim Belt Ad.indd 1 Design News | march 2013 | www.d esign n ews.com –32– 2/6/13 3:29 PM

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