A microscopic windmill could one day provide a portable method of charging devices. The tiny machines, just 1.8 millimeters at their widest point (10 can fit on a single grain of rice), can harvest energy from the movement of air.
They are the work of University of Texas, Arlington, research associate Smitha Rao and electrical engineering professor J.-C. Chiao. The pair envisions smartphone cases embedded with hundreds of windmills that could charge the phones therein when waved through the air or held by an open window on a windy day. … Read more