Figure 3.

Flexoelectricity. (A) Scheme of flexoelectricity: Membrane is plane in the absence of a membrane electric field (${\Psi }_m=0$), while a curvature is induced due to the effect of the non-zero potential. (B) Scheme of curvature definition in a bidimensional plane, where $R_1$ and $R_2$ are the two main curvature radii.