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 firstname.lastname@example.org.
Researchers have been working on a number of alternative chemistries to lithium-ion for next-gen batteries, silicon-air among them. However, while the technology has been viewed as promising and cost-effective, to date researchers haven’t managed to develop a battery of this chemistry with a viable running time -- until now.
Norway-based additive manufacturing company Norsk Titanium is building what it says is the first industrial-scale 3D printing plant in the world for making aerospace-grade metal components. The New York state plant will produce 400 metric tons each year of aerospace-grade, structural titanium parts.
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