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Programmable droplet transport on multi-bioinspired slippery surface with tridirectionally anisotropic wettability
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Cai, Zexin, Chen, Faze, Tian, Yanling, Zhang, Dawei, Lian, Zhongxu and Cao, Moyuan (2022) Programmable droplet transport on multi-bioinspired slippery surface with tridirectionally anisotropic wettability. Chemical Engineering Journal, 449 . 137831. doi:10.1016/j.cej.2022.137831 ISSN 1385-8947.
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WRAP-Programmable-droplet-transport-multi-bioinspired-slippery-surface-2022.pdf - Accepted Version - Requires a PDF viewer. Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0. Download (1975Kb) | Preview |
Official URL: http://dx.doi.org/10.1016/j.cej.2022.137831
Abstract
Directional droplet transport on functional surfaces with anisotropic wettability has shown great potential applications in various fields such as water harvesting, chemical micro-reaction, and biomedical analysis. However, the in-plane manipulation of the anisotropic droplet motion in more than two directions is still a challenge. Herein, through the fusion of inspirations from rice leaves, butterfly wings and Pitcher plants, we report a tridirectionally anisotropic slippery surface (TASS) with periodic step-like micro grooves for programmable droplet transport. TASS possesses a tridirectional droplet sliding behavior, i.e., the ultra-slipperiness along the grooves with a sliding angle of ∼ 2°, and the bidirectionally anisotropic sliding perpendicular to the grooves with sliding angle difference up to ∼ 50°, which is caused by the pinning effect of the step edge. Under the assistance of periodic vertical vibration, groove-features and droplet-volume dependent unidirectional droplets transports are realized on horizontally placed TASS, based on which two micro-reactors are designed to control the sequence of droplets merging and subsequent chemical reactions. Additionally, by utilizing the slipperiness (i.e., ultra-low sliding angle for liquid droplet) along the grooves simultaneously, programmable droplet transport under vertical vibration is further demonstrated on a tilted TASS. This work will provide a new avenue for the understanding of anisotropic wettability on asymmetric slippery surface, and thus offer a great opportunity to develop advanced interface for multidirectional droplet transport, chemical micro-reactor, etc.
Item Type: | Journal Article | |||||||||||||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | |||||||||||||||
Library of Congress Subject Headings (LCSH): | Drops , Fluid mechanics, Anisotropy | |||||||||||||||
Journal or Publication Title: | Chemical Engineering Journal | |||||||||||||||
Publisher: | Elsevier BV | |||||||||||||||
ISSN: | 1385-8947 | |||||||||||||||
Official Date: | 1 December 2022 | |||||||||||||||
Dates: |
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Volume: | 449 | |||||||||||||||
Article Number: | 137831 | |||||||||||||||
DOI: | 10.1016/j.cej.2022.137831 | |||||||||||||||
Status: | Peer Reviewed | |||||||||||||||
Publication Status: | Published | |||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||
Date of first compliant deposit: | 10 August 2022 | |||||||||||||||
Date of first compliant Open Access: | 30 June 2023 | |||||||||||||||
RIOXX Funder/Project Grant: |
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