(Color online) Toy model of ion channel. Two ionic baths are connected through a cylindrical channel with round corners. The simulation domain is obtained rotating the 2D shape around the channel axis. Red and blue spheres represent the two rings of dipoles that mimic ion channel charged groups.
Berti et al. Nanoscale Research Letters 2012 7:135 doi:10.1186/1556-276X-7-135