State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China.
Nanoscale. 2017 Nov 23;9(45):17933-17938. doi: 10.1039/c7nr06110b.
We report here the fabrication of a Janus wire mesh by a combined process of laser structuring and fluorosilane/graphene oxide (GO) modification of the two sides of the mesh, respectively, toward its applications in efficient oil/water separation. Femtosecond laser processing has been employed to make different laser-induced periodic surface structures (LIPSS) on each side of the mesh. Surface modification with fluorosilane on one side and GO on the other side endows the two sides of the Janus mesh with distinct wettability. Thus, one side is superhydrophobic and superoleophilic in air, and the other side is superhydrophilic in air and superoleophobic under water. As a proof of concept, we demonstrated the separation of light/heavy oil and water mixtures using this Janus mesh. To realize an efficient separation, the intrusion pressure that is dominated by the wire mesh framework and the wettability should be taken into account. Our strategy may open up a new way to design and fabricate Janus structures with distinct wettability; and the resultant Janus mesh may find broad applications in the separation of oil contaminants from water.
我们在此报告了一种 Janus 金属网的制备方法，该方法结合了激光构图和氟硅烷/氧化石墨烯（GO）对金属网两面的改性，以用于高效的油水分离。飞秒激光处理被用于在金属网的每一面上制造不同的激光诱导周期性表面结构（LIPSS）。一侧用氟硅烷改性，另一侧用 GO 改性，使 Janus 金属网的两面具有明显不同的润湿性。因此，一侧在空气中表现为超疏水和超亲油，另一侧在空气中表现为超亲水，在水下表现为超疏油。作为概念验证，我们使用这种 Janus 金属网演示了轻质/重质油和水混合物的分离。为了实现高效分离，需要考虑由金属网框架和润湿性主导的侵入压力。我们的策略可能为设计和制造具有明显润湿性的 Janus 结构开辟一条新途径；由此产生的 Janus 金属网可能会在从水中分离油污染物方面得到广泛应用。
