Journal
SMALL
Volume 10, Issue 23, Pages 4865-4873Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201401024
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Funding
- Alexander von Humboldt (AvH) Foundation of Germany
- Natural Science Foundation of Jiangsu Province of China [BK20130313, BK20140400, BK2011355]
- National Science Foundation of China [91027039, 51373110, 51203108]
- Jiangsu Planned Projects for Postdoctoral Research Funds [1302099B]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Project for Jiangsu Scientific and Technological Innovation Team
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Compared to conventional top-down photo-cleavage method, a facile bottom-up ink-combination method to in situ and rapidly achieve water wettability and adhesion transition, with a great contrast on the superamphiphobic TiO2 nanostructured film, is described. Moreover, such combination method is suitable for various kinds of superamphiphobic substrate. Oil-based ink covering or removing changes not only the topographical morphology but also surface chemical composition, and these resultant topographical morphology and composition engineering realize the site-selectively switchable wettability varying from superamphiphobicity to amphiphilicity, and water adhesion between sliding superamphiphobicity and sticky superamphiphobicity in micro-scale. Additionally, positive and negative micro-pattern can be achieved by taking advantage of the inherent photocatalytic property of TiO2 with the assistance of anti-UV light ink mask. Finally, the potential applications of the site-selectively sticky superamphiphobic surface were demonstrated. In a proof-of-concept study, the microdroplet manipulation (storage, moving, mixing, and transfer), specific gas sensing, wettability template for positive and negative ZnO patterning, and site-selective cell immobilization have been demonstrated. This study will give an important input to the field of advanced functional material surfaces with special wettability.
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