摘要
提出一种静电气喷法制备磁响应超疏水复合微结构表面以实现微流控液滴传输与驱动应用。首先利用静电气喷法将微米级羰基铁粉和PDMS(Polydimethylsiloxane)混合喷涂到置于磁场中的基底以构建磁响应超疏水表面,热固化后再在表面喷涂纳米碳粉以形成磁响应超疏水复合微结构表面;通过扫描电镜和显微镜分析复合微结构表面形貌,通过接触角测量仪检测功能表面的湿润性,利用液滴与表面的接触和碰撞实验测试表面的黏附性能,以磁响应特性为基础的复合微结构功能表面进行液滴驱动和定向分配应用测试。磁响应超疏水表面和复合微结构表面表现出不同的形貌和性能,喷涂纳米碳粉可以获得微纳米复合结构从而显著提升表面的疏水性和降低表面的黏附性。利用静电气喷法简单有效地制备出的磁响应超疏水复合微结构表面具有优异的超疏水性能和极低的黏附性,从而能实现不同液滴操作,具有广泛的应用前景。
The work aims to propose an electrostatic air spray method for preparing magnetic responsive superhydrophobic surface with multiscale microstructures to apply to microfluidic field.The mixture of micron-scale carbonyl iron powders and PDMS(Polydimethylsiloxane)is sprayed onto the substrate surface in a magnetic field to construct magnetic responsive superhydrophobic surfaces.After thermal curing,they are sprayed nanoscale carbon powders by respectively controlling the spray time to fabricate samples.The microstructure morphology is analyzed by a scanning electron microscope(SEM)and a digital microscope.The hydrophobic characteristics are measured by a contact angle measurement.The adhesion properties are tested by the contact and collision between the droplet and the surface.The droplet driven and directional distribution of the droplet were realized based on the surface characteristics.As a result,the surface with different microstructures shows different morphologies and properties.Spraying carbon nanoparticles can significantly improve the surface hydrophobicity and reduce the surface adhesion.The magnetic responsive surface with multiscale microstructures can be prepared simply and effectively by electrostatic air spray deposition.The prepared surface has excellent superhydrophobic properties and extremely low adhesion to achieve different droplet manipulation,showing a wide application prospect.
作者
陈逢军
向望
胡天
CHEN Fengjun;XIANG Wang;HU Tian(State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha 410082;Hunan Accuracy Intelligent Technology Co.Ltd.,Changsha 410205)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2022年第9期298-306,共9页
Journal of Mechanical Engineering
基金
国家自然科学基金(51975204)
湖南省自然科学基金(2021JJ30103)资助项目。
关键词
静电气喷
磁响应
超疏水
复合微结构表面
液滴驱动
electrostatic air spray
magnetic responsive
superhydrophobic
multiscale microstructure surface
droplet driven
