title: Micro/nanoscale hierarchical structured ZnO mesh film for separation of water and oil.
abstract: Oil contaminated water is a common problem in the world, thus to effectively separate water and oil is an urgent task for us to resolve. By control of surface wettability of a solid substrate, both superhydrophobicity and superoleophilicity on a film can be realized, which is necessary for water and oil separation. Here we report a stable superhydrophobic and superoleophilic ZnO-coated stainless steel mesh film with special hierarchical micro/nanostructures that can be used to separate a water and oil mixture effectively. Namely, the film is superhydrophobic and water cannot penetrate the mesh film because of the large negative capillary effect, while the film is superoleophilic and liquid paraffin oil can spread out quickly and permeate the mesh film spontaneously due to the capillary effect. A detailed investigation indicates that microscale and nanoscale hierarchical structures and the appropriate size of the microscale mesh pores on the mesh films play an important role in obtaining the excellent water and oil separation property. This work provides an alternative to current separation meshes and is promising in various important applications such as separation and filtration, lab-on-a-chip devices and micro/nanofluidic devices.
authors.affiliation: Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, Beihang University, Beijing, P. R. China. tiandl@buaa.edu.cn
authors.forename: Dongliang
authors.initials: D
authors.lastname: Tian
authors.forename: Xiaofang
authors.initials: X
authors.lastname: Zhang
authors.forename: Xiao
authors.initials: X
authors.lastname: Wang
authors.forename: Jin
authors.initials: J
authors.lastname: Zhai
authors.forename: Lei
authors.initials: L
authors.lastname: Jiang
mesh_terms: D057927:Hydrophobic and Hydrophilic Interactions; D008567:Membranes, Artificial; D015394:Molecular Structure; D049329:Nanostructures / Q000737:chemistry*; D009821:Oils / Q000737:chemistry*; D013193:Stainless Steel / Q000737:chemistry*; D013499:Surface Properties; D014867:Water / Q000737:chemistry*; D017155:Wettability; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D008567:Membranes, Artificial; D009821:Oils; D014867:Water; D013193:Stainless Steel; D015034:Zinc Oxide