基于磁流变弹性体膜的可控疏水表面制备与表征

针对目前超疏水表面制备工艺复杂、成本高等问题,采用工艺简单的磁场调控方法,基于磁致链化效应,将磁性颗粒-聚二甲基硅氧烷复合材料薄膜前驱体在外加匀强磁场作用下固化,得到具有微纳粗糙结构的可控疏水性磁流变弹性体膜(MREF)。利用扫描电子显微镜(SEM)和接触角测量仪对其表面形貌和润湿性进行表征分析。结果表明,制备的磁流变弹性体膜具有随机分布的微米级山状突起结构,通过控制制备磁场强度可以改变表面粗糙度特征,水滴接触角从110°提高到158.2°,呈现超疏水特性。进一步研究表明,通过控制磁性颗粒粒径尺度、磁性颗粒质量分数、薄膜厚度等因素,可以构建不同表面特征的磁流变弹性体膜,进而实现对表面疏水性的调控。

Preparation and Characterization of Tunable Hydrophobic Surfaces Based on Magnetorheological Elastomer Film

Aim at the complex and costly preparation of the superhydrophobic surfaces, a magnetic regulation method was proposed by a straightforward process. Based on the chaining of magnetic particles, the magnetorheological elastomer film (MREF) was fabricated to form rough micro-structures and tunable hydrophobicity under the magnetic field. Consisting of polydimethylsiloxane and dispersive carbonyl iron particles, the MREF was characterized using scanning electronic microscopy (SEM) and contact angle instrument. The result show that the micrometer-sized mountainous protrusions are randomly distributed at the surface of MREF, the contact angle increases from 110° to 158.2°, with different magnetic intensity in the preparation, which designates a status of superhydrophobicity. Further investigations show that film thickness, particle size and weight ratio are significant to the tunabillity of hydrophobicity for the prepared MREF surfaces.