Guided transport of water droplets on superhydrophobic-hydrophilic patterned Si nanowires.
Guided transport of water droplets on superhydrophobic-hydrophilic patterned Si nanowires.
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DOI：
10.1021/am2011756
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发表时间：
2011-11
影响因子：
9.5
通讯作者：
Jungmok Seo;Soonil Lee;Jaehong Lee;Taeyoon Lee
中科院分区：
文献类型：
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作者：
Jungmok Seo;Soonil Lee;Jaehong Lee;Taeyoon Lee
我们提出了一种在超疏水硅纳米线（NW）阵列中制造亲水图案以引导水滴的简便方法。超疏水硅纳米线阵列是通过简单的十二烷基三氯硅烷（DTS）浸涂获得的。随着 NW 长度的增加，DTS 涂覆的 Si NW 阵列的水接触角 (CA) 急剧增加并在超疏水状态（水 CA ≥ 150°）达到饱和。所展示的超疏水表面具有极高的防水性能和小于 7° 的小 CA 滞后，使水滴能够轻松滚落。通过 DTS 的 UV 增强光分解，可以将 DTS 涂层的 Si NW 阵列的润湿性从超疏水性转变为亲水性，并且通过重复 DTS 涂层和光分解过程，可以在相同表面上重现这种润湿性转换。通过超疏水硅纳米线阵列上亲水区域的选择性图案化，成功地证明了由此产生的水引导轨迹，这可以使水滴沿着定义的轨迹移动。
We present a facile method to fabricate hydrophilic patterns in superhydrophobic Si nanowire (NW) arrays for guiding water droplets. The superhydrophobic Si NW arrays were obtained by simple dip-coating of dodecyltrichlorosilane (DTS). The water contact angles (CAs) of DTS-coated Si NW arrays drastically increased and saturated at the superhydrophobic regime (water CA ≥ 150°) as the lengths of NWs increased. The demonstrated superhydrophobic surfaces show an extreme water repellent property and small CA hysteresis of less than 7°, which enable the water droplets to easily roll off. The wettability of the DTS-coated Si NW arrays can be converted from superhydrophobic to hydrophilic via UV-enhanced photodecomposition of the DTS, and such wettability conversion was reproducible on the same surfaces by repeating the DTS coating and photodecomposition processes. The resulting water guiding tracks were successfully demonstrated via selective patterning of the hydrophilic region on superhydrophobic Si NW arrays, which could enable water droplets to move along defined trajectories.