Ralph Nuzzo is a University of Illinois professor of chemistry who wants to use soft lithography instead of conventional photolithography for fabricating transistors on curved surfaces. He says the desire for a new patterning process is driven by the need to fabricate components over large formats with unconventional materials. Soft lithography is better for component fabrication on curved surfaces because the process is compliant and conforms to small surface irregularities. Soft lithography patterning techniques, such as micron-scale polymer molding, require that the mold be flexible enough to conform to the curvature of the substrate, but stiff enough to preserve the integrity of the pattern. Fabricating microstructures on spherically curved substrates required depositing thin films of aluminum, silicon, and silicon nitride. When the mold contacted the substrate, Nuzzo flowed polyurethane into the mold, cured it, and peeled away the mold. The resulting polyurethane pattern on the substrate measured 30 microns. Thin-film arrays deposited on spherically curved substrates have potential applications in optical detectors for taking pictures over a wide field of view. Contact Nuzzo at (217) 244-0809 or e-mail email@example.com.
During a teardown of the iPad Air and Microsoft Surface Pro 3 at the Medical Design & Manufacturing Show in Schaumburg, Ill., an engineer showed this "inflammatory" video about the dangers of maliciously mishandling lithium-ion batteries.
The Window Watcher stops the burglar before he does damage or enters the house. House alarm service companies set off alarms and call the service only after the burglar has damaged and entered the house.
If you’re designing a handheld device or industrial machine that will employ a user interface, then you’ll want to check out the upcoming Design News Continuing Education Center course, "Engineering Principles Behind Advanced User Interface Technologies.”
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.