Don't wire a circuit—doodle it. To connect batteries to devices such as resistors and LEDs, a newly developed ballpoint pen uses silver-based ink that conducts electricity through lines drawn over paper, wood, plastic and even some textiles. Jennifer Lewis, the materials scientist who led the pen's design at the University of Illinois, says she is now looking for business partners and hopes to have products that integrate the pen and ink on the market within a few months. Check out video of the ink below!
Over the weekend, faced with the dreaded Yellow Light of Death, I ripped apart a PlayStation 3 and blasted it with a 500-degree heat gun to re-flow the GPU and CPU. It was pretty fun and it worked, much to the delight of the member of my household who was this close to finishing “Batman: Arkham City.” Next time, this new self-healing circuit compound could make our work unnecessary.
And the $64,000 question is ... does graphite conduct electricity? It certainly does! The video demonstration displays this quite convincingly. Graphite is an interesting material, an allotrope of carbon (as is diamond). It displays properties of both metals, and nonmetals. However, like a metal, graphite is a very good conductor of electricity due to the mobility of the electrons in its outer valence shells.