Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190 (P.R. China).
School of Chemistry and Environment, Beihang University, Beijing 100191 (P.R. China).
Angew Chem Int Ed Engl. 2015 Dec 1;54(49):14732-7. doi: 10.1002/anie.201506866. Epub 2015 Oct 23.
Oil/water separation membranes with different wettability towards water are attractive for their economic efficiency and convenience. The key factor for the separation process is the roughness-enhanced wettability of membranes based on the intrinsic wetting threshold (IWT) of water, that is, the limitation of the wettability caused by hydrophobicity and hydrophilicity. However, the separation of organic liquids (OLs) remains a challenge. Herein, we manipulate the surface tensions of nanofibrous membranes to lie between the IWTs of the two OLs to be separated so that the nanofibrous membranes can be endowed with superlyophobicity and superlyophilicity for the two liquids, and thus lead to successful separation. Our investigations provide a general strategy to separate any immiscible liquids efficiently, and may lead to the development of membranes with a large capacity, high flux, and high selectivity for organic reactions or liquid extraction in chemical engineering.
具有不同润湿性的油水分离膜具有经济效益高和使用方便的特点，因此备受关注。分离过程的关键因素是基于水的固有润湿阈值（IWT）增强膜润湿性的粗糙度，即由疏水性和亲水性引起的润湿性的限制。然而，有机液体（OLs）的分离仍然是一个挑战。在此，我们操纵纳米纤维膜的表面张力介于要分离的两种 OL 的 IWT 之间，以使纳米纤维膜对两种液体具有超疏油性和超亲油性，从而实现成功分离。我们的研究为有效分离任何不混溶的液体提供了一种通用策略，并可能导致开发出具有大容量、高通量和高选择性的膜，用于化学工程中的有机反应或液体萃取。
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