Capitalizing on the friction and heat created by walking, running and even just wearing jeans, engineers from Michigan Technological University, Arizona State University and NanoSonic Inc. devised a way to use this type of generated energy in a concept backpack that can charge portable electronic devices, like iPods and mobile phones. Shoulder straps made of polyvinylidene fluoride (PVDF), a strong, flexible material that feels similar …
Piezoelectric Concept Backpack
