The effect of seawater concentration on seawater's microstructure and dynamics

To enhance the efficiency of a new seawater desalination technique based on rotating coupling electromagnetic theory, and to optimize its parameters and to select the proper electronic and reverse osmosis membranes, we investigate the effects of seawater concentration on the seawater's microstructure and dynamics by molecular dynamics (MD) simulations in details. The results indicate that with the increment of ion concentration, the ion-ion interaction strengthens, while the ion-water and water-water interactions weaken, resulting in reducing seawater short-range order. The number of the contact ion pairs as well as the solvent separated ones increases. The hydrogen bond network is gradually indistinct, and the self-diffusion coefficient of water molecule decreases. Therefore, the increment of ion concentration is disadvantageous to seawater desalination.