Author/Authors :
Sun، نويسنده , , Shuai and Wang، نويسنده , , Chengyang and Chen، نويسنده , , Mingming and Li، نويسنده , , Mingwei، نويسنده ,
Abstract :
The stability of graphene oxide (GO) membranes in a sodium sulfate aqueous solution is reported. The mechanism for the stability was interpreted with the assistance of molecular dynamic (MD) simulations as follows: GO disperses uniformly in water because it is hydrated. However, the hydration of GO is weakened when Na2SO4 is present because the Na+ and SO42− ions are preferentially hydrated over GO. Thus the movement of GO in the Na2SO4 solution becomes restricted and it is difficult for the GO in a GO membrane to uniformly disperse in a Na2SO4 solution even with ultrasonic treatment.
