Title: NaCl crystal from salt solution with far below saturated concentration under ambient condition,
Abstract: Under ambient conditions, we directly observed NaCl crystals experimentally
in the rGO membranes soaked in the salt solution with concentration below and
far below the saturated concentration. Moreover, in most probability, the NaCl
crystals show stoichiometries behavior. We attribute this unexpected
crystallization to the cation-{\pi} interactions between the ions and the
aromatic rings of the rGO.