NDLI: Anisotropic sliding on dual-rail hydrophilic tracks

Content Provider	Royal Society of Chemistry (RSC)
Author	Yang, Xiaolong Deng, Xu Song, Jinlong Lu, Xiaohong Sun, Jing Zhao, Danyang Liu, Xin Zheng, Huanxi
Copyright Year	2017
Abstract	Biomimetic surfaces with sliding angle (SA) anisotropy have the capacity to directionally control the motion of water droplets and therefore have wide applications in various domains. Parallel and narrowing dual-rail hydrophilic tracks (DRHTs) are fabricated on etched superhydrophobic Al surfaces using a micromilling technique. Orthogonal and linear SA anisotropies are observed and investigated on the parallel and narrowing DRHTs, respectively. Track spacings of the parallel DRHTs are designed to regulate the orthogonal SA anisotropy of the water droplet. Experimental data shows that the along-track droplet–substrate interfacial widths, together with the sliding anisotropy, decrease with the increase of the track spacings. SA contrast (linear SA anisotropy) in two opposite directions along the tracks is observed and discussed on the narrowing DRHTs. Results indicate that droplets slide with more difficulty in the spacing-expanding direction than those in the shrinking direction, and when a droplet is dispensed at the tail end of a DRHT segment, the along-track outward detaching SAs and inward SAs also show sharp linear anisotropy due to the droplet–track interfacial liquid tension. On the basis of the discussed orthogonal and linear SAs, potential lab-on-a-chip applications for intelligent droplet transport, mixing and capture & release are explored.
Starting Page	1041
Ending Page	1050
Page Count	10
File Format	HTM / HTML PDF
ISSN	14730197
Volume Number	17
Issue Number	6
Journal	Lab on a Chip
DOI	10.1039/c7lc00028f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Anisotropy Lab-on-a-chip Hydrophile Orthogonality Ultrahydrophobicity
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Biochemistry Bioengineering Biomedical Engineering

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