Long-range spontaneous droplet self-propulsion on wettability gradient surfaces.
Long-range spontaneous droplet self-propulsion on wettability gradient surfaces.
复制标题
DOI：
10.1038/s41598-017-07867-5
复制
发表时间：
2017-08-08
影响因子：
4.6
通讯作者：
Zhou X
中科院分区：
文献类型：
--
作者：
Liu C;Sun J;Li J;Xiang C;Che L;Wang Z;Zhou X
液滴的定向和远距离输运在微流控系统中具有重要意义。但是，它通常需要外部能量输入。在这里，我们设计了一个润湿性梯度表面，可以驱动液滴运动的结构形貌。通过刻蚀硅纳米柱和调整亲水性二氧化硅平面的面积，实现了从超疏水到亲水的润湿性梯度范围超过150°。我们进行了力分析，以进一步揭示液滴自推进的机制，并发现纳米结构是提供大的驱动力和小的阻力的关键。通过理论计算，分析了不同梯度表面上不同液滴体积下的最大自推进位移。在此基础上，设计了多个具有任意路径的表面，实现了液滴的定向远距离输送。这些结果阐明了润湿梯度表面上液滴自推进的驱动机制，为微流控系统中液滴的长距离和定向输运开辟了新的机会。
The directional and long-range droplet transportation is of great importance in microfluidic systems. However, it usually requires external energy input. Here we designed a wettability gradient surface that can drive droplet motion by structural topography. The surface has a wettability gradient range of over 150° from superhydrophobic to hydrophilic, which was achieved by etching silicon nanopillars and adjusting the area of hydrophilic silicon dioxide plane. We conducted force analysis to further reveal the mechanism for droplet self-propulsion, and found that the nanostructures are critical to providing a large driving force and small resistance force. Theoretical calculation has been used to analyze the maximal self-propulsion displacement on different gradient surfaces with different volumes of droplets. On this basis, we designed several surfaces with arbitrary paths, which achieved directional and long-range transportation of droplet. These results clarify a driving mechanism for droplet self-propulsion on wettability gradient surfaces, and open up new opportunities for long-range and directional droplet transportation in microfluidic system.
登录
查看更多内容
影响因子：
9.5
作者：
Faustini, Marco;Ceratti, Davide R.;Grosso, David
通讯作者：
Grosso, David
影响因子：
64.8
作者：
CAZABAT, AM;HESLOT, F;CARLES, P
通讯作者：
CARLES, P
影响因子：
9.5
作者：
Giri, Dipak;Li, Zi;Higgins, Daniel A.
通讯作者：
Higgins, Daniel A.
影响因子：
8.6
作者：
Checco, Antonio;Ocko, Benjamin M.;Dietrich, Siegfried
通讯作者：
Dietrich, Siegfried
影响因子：
8.6
作者：
Lazar, P;Riegler, H
通讯作者：
Riegler, H