仿生沟槽锥形结构多种环境下油滴的自运输研究  

Self-transport of Oil Droplets in Various Environments on Biomimetic Groove Tapered Structure

作　　者：雷超翔 宋岳干[1] 吴威明 李耀霞 陈祖巧 李国强 LEI Chao-xiang;SONG Yue-gan;WU Wei-ming;LI Yao-xia;CHEN Zu-qiao;LI Guo-qiang(School of Manufacturing Science and Engineering,Southwest University of Science and Technology,Sichuan Mianyang 621010,China)

机构地区：[1]西南科技大学制造科学与工程学院,四川绵阳621010

出　　处：《表面技术》2023年第8期363-370,共8页Surface Technology

基　　金：西南科技大学大学生创新训练项目(S202110619091)。

摘　　要：目的虽然传统锥形结构可以实现水下油滴的定向运动,但在复杂环境中连续自适应的油滴自运输仍然是一个挑战。为此研发一种新型沟槽锥形结构表面,以实现多种环境下高效的油滴自运输。方法受到水稻叶各向异性沟槽结构和仙人掌刺不对称锥形结构的启发,采用飞秒激光直写扫描系统在聚四氟乙烯上下表面加工沟槽锥形结构。借助接触角测试平台表征结构表面的润湿性,并通过扫描电子显微镜对表面微沟槽形貌进行分析。使用高速相机记录结构在水环境、水-空气界面和空气中的油滴运输过程,并以此为基础分析研究结构在多种环境下的油滴自运输能力。结果沟槽锥形结构实现了在水下、空气中及水-空气界面多种环境下油滴的连续自运输,并且展示出优于传统锥形结构的高效水下油滴自运输能力,收集速率达到112.17 mm/s。结论利用沟槽锥形结构良好的结构扩展性、无须消耗能源或外力驱动的操作模式和优异的油滴自运输能力,制备了水下自驱动集油装置,展示了该结构的潜在应用。Although the traditional tapered structure can realize the directional movement of underwater oil droplets,the continuous adaptive self-transport of oil droplets in complex environments remains a challenge.Therefore,the subject aims to develop a new groove tapered structure surface to achieve efficient self-transport of oil droplets in various environments.Inspired by the anisotropic groove structure of rice leaves and the asymmetric tapered structure of cactus spines,we obtained the micro groove structure on the upper and reverse surfaces of polytetrafluoroethylene by 100 mW femtosecond laser processing.The groove tapered structure with different angels was gotten followed 220 mW.The wettability of the structure surface was characterized by the contact angle test platform and the surface micro groove morphology was analyzed by a scanning electron microscope.The self-transport capacity of oil droplets in various environments was analyzed and studied with a high-speed camera to record the transport process of oil droplets under water,air-water interface and in air.Firstly,the sample was placed vertically in water and dichloroethane was placed on the surface of the super-oleophobic aluminum sheet.By moving the base of the aluminum sheet,the oil droplets approached the top of the tapered structure and were then transported by the tapered structure from its top to bottom.The comparative experiment of underwater transport of groove and grooveless tapered structures was carried out.Then as the above method,2μL dichloroethane oil drops on samples with different tapered angles were transported,the relations between tapered angle and oil drops transport rate on the groove tapered structure were revealed.Furthermore,the transport capacity of the groove tapered structure under different oil drop volumes,different tilt angles and the maximum volume of its underwater oil drop transport were explored.Finally,the oil drop transport capacity of the structure was tested in the air and air-water interface.The research results sho

关 键 词：沟槽锥形结构 拉普拉斯压力 毛细力 多种环境 油滴自运输 

分 类 号：TB34[一般工业技术—材料科学与工程]