摘要：SummaryIt is of great importance and practical value to develop a facile and operable surface treatment method of materials with excellent antipollution and antiadhesion property, but still a huge challenge. In this work, a series of pseudo-zwitterions are prepared from electrostatic assembly of cationic polyethyleneimine and anionic phosphonic clusters. These pseudo-zwitterionic assemblies provide a strong hydration through electrostatic interaction with water and in turn create a barrier against oil foulants, leading to a nearly zero crude oil adhesion force. The pseudo-zwitterions-decorated surfaces exhibit exceptional water-cleanable oil-repellent property, even when they are completely dried and without prehydration before fouled by crude oil. While using these pseudo-zwitterions-modified polymeric membranes for separating surfactant stabilized oil-in-water emulsion, less than 10% decline of permeating flux is observed throughout a 2-h continuous separation experiment, showing excellent emulsion separation ability and antipollution performance for high viscous oil.Graphical abstractDisplay OmittedHighlights•The ion pairs called pseudo-zwitterions were constructed by electrostatic self-assembly•The pseudo-zwitterions-modified surfaces can repel crude oil without prehydration•Pseudo-zwitterionic membrane shows exceptional antioil fouling performance•The strategy gives a new way to endow the surfaces with excellent antiadhesion propertyMaterials science; Materials chemistry; Materials synthesis; Materials property
