微纳米复合的各向异性结构表面的液滴驱动  

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

作　　者：李丹 郑咏梅[1] 

机构地区：[1]北京航空航天大学化学与环境学院化学系,北京100191

出　　处：《高等学校化学学报》2018年第1期109-114,共6页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21234001;21473007;21771015)资助~~

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400μm的倾斜锥状纤维,其底部和顶部直径分别约为200和80μm,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1μm.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.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 Zn O 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 Zn O nanohairs cover fully over every fibers,where the Zn O nanohairs have the diameters of 80—100 nm and the lengths of ca. 1 μm. The sample is hydrophobic with a contact angle of142. 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.

关 键 词：微纳米复合 各向异性 液滴滚动 定向弹跳 

分 类 号：O647[理学—物理化学]