期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 2, 期 43, 页码 18531-18538出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta04090b
关键词
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资金
- Alexander von Humboldt (AvH) Foundation of Germany
- Natural Science Foundation of Jiangsu Province of China [BK20130313, BK20140400]
- National Science Foundation of China [91027039, 51373110]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Project for Jiangsu Scientific and Technological Innovation Team
- Jiangsu Planned Projects for Postdoctoral Research Funds [1302099B]
Hierarchical surfaces with specific topographical morphology and chemical components can be found on many living creatures in nature. They offer special wettability and adhesion (sliding, sticky or patterned superhydrophobic surfaces), a functional platform for microfluidic management and other biological functions. Inspired by their precise arrangement of structures and surface components, we described a facile one-step electrochemical technique to create dual-scale hierarchical anatase TiO2 structures with the combination of pinecone-like micro-particle upper layers and dense-stacked nanoparticle bottom layers in a large scale. The as-prepared TiO2 films display environment-responsive wettability with good dynamical stability. Extremely high contrast of adhesion (2.5-170 mu N) can be realized by simply adjusting the physical structures (anodizing voltage and electrolyte concentration dependent) to control the solid-liquid contact state (from Rose to Lotus state). In addition, erasable and rewritable patterned superhydrophobic TiO2 films were constructed for a versatile platform for microfluidic management. In a proof-of-concept study, robust super-antiwetting films for on-demand droplet separation, mixing and transportation under an ambient atmosphere or an underwater environment, and patterned superhydrophobic surfaces for liquid self-assembling or anti-counterfeiting marks were demonstrated.
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