Although still three to five years away, computers based on light signals instead of electrical signals might put the Pentium chip to shame. Since 1992, scientists knew that the holes in porous silicon contain microscopic structures that emit light when electric current is applied. But the untreated material was fragile. Oxygen and water molecules in the air interact with the surface and create a glass-like coating that disrupts its photoluminescence properties. Jillian Buriak, assistant professor in Purdue's Department of Chemistry, discovered a way to stabilize the substrate's surface by coating the porous surface of the silicon with Lewis acid, a solution which produces a greasy coating. "Because most current technology is based on silicon, it may be relatively easy to develop the optical applications and combine them with current technologies, as the manufacturing processes are already in place," Buriak says. Porous silicon could easily serve as a flat, display area for computer screens, as well as a basis for computers that operate on light signals.
Wal-Mart will hold its second Made in the USA Open Call July 7-8, at its headquarters in Bentonville, Ark. The event will be a repeat effort by the world’s biggest seller of consumer goods to increase the amount of US-made products it sells in Wal-Mart stores, in Sam’s Club members-only wholesale outlets, and on walmart.com.
This year, Design News is getting a head start on the Fourth of July celebration. In honor of our country and its legacy of engineering innovation -- in all of its forms -- we are taking you on an alphabetical tour through all 50 states to showcase interesting engineering breakthroughs and historically significant events.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.