The latest news from academia, regulators
research labs and other things of interest
Posted: Jul 04, 2017
Molecular insights into water desalination with graphene oxide membranes
(Nanowerk News) In new work, scientists performed a pressure-driven flow simulation of ionic aqueous solutions across bilayer graphene oxide (GO) membranes to investigate the effects of staggered nanoslits on desalination properties using classical molecular dynamics (MD) simulation (read about What is graphene?.
They performed reverse osmosis (RO) pressure-driven flow to investigate the effect of geometrical parameters and salt species on the performance of GO membranes.
The synthesized flow model used by the team can be divided into three parts: the entrance of a nanoslit; the conjunction between the gap and passage; and the interlayer inside the capillary channel.
The whole permeation of the GO films is dependent on the series-parallel combination of three resistances in these three parts. The scientists monitored variable configurational parameters to elucidate the effect of different structures.
To eliminate the variance between the classical model and nanoscaled flow, which is caused by the effect of size on the shrunken real flow area, they obtained modified geometrical parameters from density analysis.
MD results show that the water flow rate has a parabolic relation with slit width and decreases for a greater slit alignment, quantitatively in agreement with the theoretical prediction with modified geometrical parameters.