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Underwater Superoleophobic Surface Based on Silica Hierarchical Cylinder Arrays with a Low Aspect Ratio

Authors
  • Liu, Wendong1, 2
  • Xiang, Siyuan1, 2
  • Liu, Xueyao1
  • Yang, Bai1
  • 1 Jilin University, People’s Republic of China
  • 2 Max Planck Institute for Polymer Research, Germany , (Germany)
Type
Published Article
Journal
ACS Nano
Publisher
American Chemical Society
Publication Date
Jul 09, 2020
Volume
14
Issue
7
Pages
9166–9175
Identifiers
DOI: 10.1021/acsnano.0c04670
PMID: 32644775
PMCID: PMC7460563
Source
PubMed Central
Keywords
License
Unknown

Abstract

A superantiwetting surface based on low-aspect-ratio hierarchical cylinder arrays (HCAs) was successfully obtained on a silica substrate by colloidal lithography with photolithography. Colloidal lithography is a technique involving transfer of a pattern to a substrate by etching or exposure to a radiation source through a mask composed of a packed colloidal crystal, while photolithography is utilized by which a pattern is transferred photographically to a photoresist-coated substrate, and the substrate is subsequently etched. The surface provides an alternative approach to apply aligned micro-nano integrated structures with a relatively low aspect ratio in superantiwetting. The obtained HCAs successfully integrated micro- and nanoscale structures into one system, and the physical structure of the HCAs can be tuned by modulating the fabrication approach. Using a postmodification process, the underwater–oil wetting behavior of cylinder-array based surfaces can be easily modulated from the superoleophobic state (an oil contact angle (OCA) of 161°) to oleophilic state (an OCA of 19°). Moreover, the underwater–oil wettability can be reversibly transformed from the superoleophobic state (an OCA of approximately 153°) into the oleophilic state (an OCA of approximately 31°) by grafting stimuli-responsive polymer (PNIPAAm) brushes onto this specific hierarchical structure. Due to the temperature-responsive property, modifying the surface with PNIPAAm provides a possibility to control the oil wettability (repellent or sticky) by temperature, which will benefit the use of HCAs in oil–water separation and other application fields.

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