Rice University theorists have calculated flexoelectric effects in double-walled carbon nanotubes. The electrical potential (P) of atoms on either side of a graphene sheet (top) are identical, but not when the sheet is curved into a nanotube. Double-walled nanotubes (bottom) show unique effects as band gaps in inner and outer tubes are staggered.
(from R-L): Assoc Prof Liu Linbo and one of his researchers Dr Xinyu Liu from NTU Singapore, have developed the prototype of a handheld medical imaging device, which produces images 100 times higher resolution than what X-Ray, computed tomography (CT) and Magnetic Resonance Imaging (MRI) machines can provide.