Femtosecond laser ablated durable superhydrophobic PTFE films with micro-through-holes for oil/water separation: Separating oil from water and corrosive solutions

[Display omitted] •Superhydrophobic/superoleophilic PTFE sheet was fabricated by the femtosecond laser ablation.•The surfaces showed durable superhydrophobicity even after storing in various harsh environments.•A penetrating array was further generated by subsequent mechanical drilling process.•The...

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Bibliographic Details
Published in:Applied surface science 2016-12, Vol.389, p.1148-1155
Main Authors: Yong, Jiale, Fang, Yao, Chen, Feng, Huo, Jinglan, Yang, Qing, Bian, Hao, Du, Guangqing, Hou, Xun
Format: Article
Language:English
Subjects:
Durability
Femtosecond laser
Oil/water separation
PTFE
Superhydrophobic
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Summary:[Display omitted] •Superhydrophobic/superoleophilic PTFE sheet was fabricated by the femtosecond laser ablation.•The surfaces showed durable superhydrophobicity even after storing in various harsh environments.•A penetrating array was further generated by subsequent mechanical drilling process.•The microholes surface is very efficient to separate the mixtures of oil and corrosive solutions. Separating the mixture of water and oil by the superhydrophobic porous materials has attracted increasing research interests; however, the surface microstructures and chemical composition of those materials are easily destroyed in a harsh environment, resulting in materials losing the superhydrophobicity as well as the oil/water separation function. In this paper, a kind of rough microstructures was formed on polytetrafluoroethylene (PTFE) sheet by femtosecond laser treatment. The rough surfaces showed durable superhydrophobicity and ultralow water adhesion even after storing in various harsh environment for a long time, including strong acid, strong alkali, and high temperature. A micro-through-holes array was further generated on the rough superhydrophobic PTFE film by a subsequent mechanical drilling process. The resultant sample was successfully applied in the field of oil/water separation due to the inverse superhydrophobicity and superoleophilicity. The designed separation system is also very efficient to separate the mixtures of oil and corrosive acid/alkali solutions, exhibiting the strong potential for practical application.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2016.07.075