Inspired by fish scales, superhydrophilic and underwater superoleophobic alumina membranes were fabricated in this study. Dopamine deposited on the surface of alumina membranes through immersion over time, and then crosslinking reaction occurred with polyethyleneimine (PEI), which was confirmed by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. It induced the modified layer coated on the membrane surface. Values of water contact angle of the modified alumina membranes were ~ 0° in air. Values of underwater oil contact angle reached 155°, which indicated it was superhydrophilic and underwater superoleophobic. More particles engendered with the increase in the reaction time with PEI, which induced the decrease in the pore sizes and permeation flux. All values of oil rejection were higher than 98.5%. No obvious deterioration of permeation flux could be found. The rejection hardly suffered a sharp decline over 800 min. It indicates that the modified layer can firmly stick to the alumina membranes. Therefore, the as-prepared alumina membrane is promising for practical oil/water separation.

受鱼鳞的启发，本研究制作了超亲水性和水下超疏油性氧化铝膜。多巴胺经过一段时间的浸入而沉积在氧化铝膜表面，然后与聚乙烯亚胺（PEI）发生交联反应，这通过傅里叶变换红外光谱和X射线光电子能谱得到了证实。它诱导了涂在膜表面的改性层。改性氧化铝膜在空气中的水接触角值为〜0°。水下油接触角的值达到155°，表明它是超亲水的和水下超疏油的。随着与PEI反应时间的增加，产生了更多的颗粒，这导致了孔径和渗透通量的减小。所有拒油率均高于98.5％。没有发现渗透通量明显下降。在800分钟内，拒绝率几乎没有急剧下降。这表明改性层可以牢固地粘附到氧化铝膜上。因此，所制备的氧化铝膜有望用于实际的油/水分离。