期刊
ADVANCED MATERIALS INTERFACES
卷 2, 期 9, 页码 -出版社
WILEY
DOI: 10.1002/admi.201500071
关键词
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资金
- Australian National University
- Australian Research Council Australian Postdoctoral Fellowship
- NHMRC Career Development Fellowship
- Future Engineering Research Leadership (FERL) fellowship
- ANU-Discovery Translation Fund [DTF078]
- Centre for Advanced Microscopy (CAM)
- Australian Microscopy and Microanalysis Research Facility (AMMRF)
Precise manipulation of water is a key step in numerous natural and synthetic processes. Here, a new flexible and transparent hierarchical structure is determined that allows ultra-dexterous manipulation and lossless transfer of water droplets. A 3D nanomesh is fabricated in one step by scalable electrospinning of low-cost polystyrene solutions. Optimal structures are composed of a mesh of dense nanofiber layers vertically separated by isolated mesoporous microbeads. This results in a highly adhesive superhydrophobic wetting that perfectly mimics rose petal-like structures. Structural-functional correlations are obtained over all key process parameters enabling robust tailoring of the wetting properties from hydrophilic to lotus-like Cassie-Baxter and rose-like Cassie-impregnating states. A mechanistic model of the droplet adhesion and release dynamics is obtained alongside the first demonstration of a mechanically induced transfer of microdroplets between two superhydrophobic coatings. This low-temperature reaction-free material structure demonstrates a facile means to fabricate impenetrable residue-less rose petal-like surfaces with superhydrophobic contact angles of 152 +/- 2 degrees and effective adhesion strength of 113 +/- 2 degrees mu N. This is a significant step toward parallel, multistep droplet manipulation with applications ranging from flexible on-paper devices to microfluidics and portable/wearable biosensors.
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