高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (1): 109.doi: 10.7503/cjcu20170329

• 物理化学 • 上一篇    下一篇

微纳米复合的各向异性结构表面的液滴驱动

李丹, 郑咏梅   

  1. 北京航空航天大学化学与环境学院化学系, 北京 100191
  • 收稿日期:2017-05-26 出版日期:2018-01-10 发布日期:2017-12-18
  • 作者简介:联系人简介: 郑咏梅, 女, 博士, 教授, 博士生导师, 主要从事仿生多梯度表面及液滴驱动方面的研究. E-mail:zhengym@buaa.edu.cn
  • 基金资助:
    国家自然科学基金(批准号: 21234001, 21473007, 21771015)资助

Self-propelled Droplet Movement on Micro/nano Anisotropic Structures Surface

LI Dan(), ZHENG Yongmei*()   

  1. Department of Chemistry, School of Chemistry and Environment, Beihang University, Beijing 100191, China
  • Received:2017-05-26 Online:2018-01-10 Published:2017-12-18
  • Contact: ZHENG Yongmei E-mail:zhengym@buaa.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.21234001, 21473007, 21771015)

摘要:

通过聚二甲基硅氧烷和Co粉混合物模板复型、 外加磁场控制法和氧化锌纳米线水热生长法, 制备了微纳米复合的各向异性结构表面. 该结构表面规整分布着间距为400 μm的倾斜锥状纤维, 其底部和顶部直径分别约为200和80 μm, 长度约为1 mm. 锥状纤维的表面覆有氧化锌纳米线, 其直径约为80~100 nm, 长度约为1 μm. 该表面呈疏水性, 接触角约为142.5°, 且具有浸润性各向异性的特征. 实验结果表明, 液滴在该表面可以定向弹跳或在垂直振动情况下定向滚动, 为设计驱动液滴的功能性材料提供了思路.

关键词: 微纳米复合, 各向异性, 液滴滚动, 定向弹跳

Abstract:

The micro/nano anisotropic structures was controllably fabricated by soft lithography using polydimethylsiloxane(PDMS) and Co nanoparticle composite under the external magnetic field and covering of ZnO nanohairs via nanocrystalline growth technique. The sample is covered with periodicities of ca. 400 μm conical fibers and the conical fibers diameter of ca. 200 μm. The tip diameter of cone is ca. 80 μm. The length of the cone is ca. 1 mm. The ZnO nanohairs cover fully over every fibers, where the ZnO nanohairs have the diameters of 80—100 nm and the lengths of ca. 1 μm. The sample is hydrophobic with a contact angle of 142.5° andanisotropic wettability. The result indicates that the droplets can roll under vertical vibration or bounce directionally. This finding offers an insight into design of functional structures for droplets move in direction.

Key words: Micro/nano, Anisotropic, Droplets rolling-off, Bounce in direction

中图分类号: 

TrendMD: