▎ 摘　　要

The size of graphene oxide (GO) has an effect on the properties of GO membranes (GOMs). However, the relationship between the influences of size and oxidation degree of GO on GOMs has not been thoroughly studied. In this study, we prepare to GO with different sizes by adjusting ultrasonic power and reduce GO in alkaline reduction. Pressure assisted self-assembly method is used to fabricate GO and reduced GOMs. The decreasing size increases the roughness and flux of GOM, and weakens the effect of reduction on the enhancement of the permeability of GOM. Even the permeability is reduced by reduction when the size is small enough. The penetration mechanism is related to the size of nanosheets that would influence the wrinkled structure, the wetting performance, and the channel structure of GOM.