张学仁,张亚锋,顾兴士,余家欣.微液滴/注液表面黏附行为的主被动控制及机理[J].表面技术,2023,52(10):304-312.
ZHANG Xue-ren,ZHANG Ya-feng,GU Xing-shi,YU Jia-xin.Active/Passive Control and Mechanism of the Adhesion Behaviors of Droplet/Liquid-infused Surface[J].Surface Technology,2023,52(10):304-312 |
| 微液滴/注液表面黏附行为的主被动控制及机理 |
| Active/Passive Control and Mechanism of the Adhesion Behaviors of Droplet/Liquid-infused Surface |
| 投稿时间：2022-10-13 修订日期：2023-01-17 |
| DOI：10.16490/j.cnki.issn.1001-3660.2023.10.026 |
| 中文关键词: 微液滴 注液表面 黏附 电润湿 界面调控 |
| 英文关键词:microdroplet liquid-infused surface adhesion electrowetting interface adjustment |
| 基金项目:四川省科技厅项目(2022ZHCG0050);中国空气动力研究与发展中心结冰与防除冰重点实验室开放课题(IADL20210103，IADL20210403) |
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| Author | Institution |
| ZHANG Xue-ren | Key Laboratory of Testing Technology for Manufacturing Process, Ministry of Education, Southwest University of Science and Technology, Sichuan Mianyang 621010, China |
| ZHANG Ya-feng | Key Laboratory of Testing Technology for Manufacturing Process, Ministry of Education, Southwest University of Science and Technology, Sichuan Mianyang 621010, China |
| GU Xing-shi | Key Laboratory of Icing and Anti/De-icing, China Aerodynamics Research and Development Center, Sichuan Mianyang 621000, China |
| YU Jia-xin | Key Laboratory of Testing Technology for Manufacturing Process, Ministry of Education, Southwest University of Science and Technology, Sichuan Mianyang 621010, China |
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| 中文摘要: |
| 目的 提出一种微液滴/注液表面黏附行为主/被动控制方法，探究在电压和流体黏度耦合作用下微液滴/注液表面黏附行为动态可调机理。方法 在P型硅片表面制备超疏水层，注入黏度分别为10、50、100 mm2/s的聚二甲基硅油制得注液表面，使用固液界面行为测试仪探究不同黏度和外加电压下微液滴/注液表面的黏附行为。结果 当聚二甲基硅油黏度从10 mm2/s增加到100 mm2/s，微液滴/注液界面润湿力从194 μN减小到123 μN，最大相互作用力从129 μN减小到94 μN，分离力从101 μN减小到82 μN;当电压从0 V增加到240 V时，润湿力从156 μN增加到322 μN左右，最大相互作用力从120 μN增加到178 μN左右，分离力从85 μN减小到53 μN左右，实现了黏附力的动态调节。结论 高黏度聚二甲基硅油内部具有较强的剪切力，但是长链会增强微液滴/注液表面氢键作用，在2种作用形式的耦合下，润湿力、最大相互作用力以及分离力随黏度的增加而减小。在电压作用下，微液滴在注液表面产生电润湿行为，有效界面能随电压发生非线性响应，实现了固液界面黏附力的实时调节。微液滴/注液表面可以通过改变电压与润滑油的黏度实现黏附行为的主/被动的调节。 |
| 英文摘要: |
| Controlling microdroplets has gotten wide attention due to its potential applications in drug delivery, microfluidic devices and lab on chip, etc. Recently, various methods were used to manipulate microdroplet. For example, surfaces were modified by coating with different surface energy, or by micro-structures to change the property of surface to manipulate microdroplet. These methods were classified as passive methods because the functions of the surface could not be changed when the surface was modified. Moreover, active methods, such as temperature, light, electricity, magnetism and mechanical stress, etc. were used to manipulate microdroplet dynamically. However, although the adhesion behavior at liquid/solid interface could be adjusted, some obstacles such as long response time, high energy consumption and droplet pollution, limited the application of those technologies. Therefore, a combined active and passive approach was required to manipulate microdroplets with fast response time, low energy consumption, and no pollution. In this study, silicon chip with size of 20 mm×20 mm was used as substrate. To ensure the conductivity, the back of the silicon chip was ground with sandpaper to remove the oxide layer. Then, the silicon chip was coated by spraying superhydrophobic liquid. After drying for 1 h, the superhydrophobic film was formed. The liquid-infused surfaces were prepared by adding lubricating oil (polydimethylsiloxane) to the superhydrophobic surface. Droplet was placed on the oil-infused surface and then electrowetting system on the droplet/oil-infused surface was established with applied voltage. Lubricant with viscosity of 10 mm2/s, 50 mm2/s and 100 mm2/s and applied voltage (0-240 V) were used in this work. Moreover, the effect of oil viscosity and applied voltage on the droplet/oil-infused surface adhesion behaviors was investigated. The adhesion mechanisms under the coupling effects of lubricating oil viscosity and applied voltage were studied. The adhesion force variation process could be described with snap-in force, maximum force and pull-off force. The snap-in force decreased from 194 μN to 123 μN, the maximum force decreased from 129 μN to 94 μN, and the pull-off force decreased from 101 μN to 82 μN when the liquid viscosity increased from 10 mm2/s to 100 mm2/s. Snap-in force increased from 156 μN to 322 μN, the maximum force increased from 120 μN to 178 μN and the pull-off force decreased from 85 μN to 53 μN when the applied voltage increased from 0 V to 240 V. Active control of the adhesion behaviors is achieved. It is indicated that the high-viscosity polydimethylsiloxane has strong internal shear force, however, the long chain will enhance the hydrogen at the droplet/liquid-infused surface. Consequently, the snap-in force, the maximum force and the pull-off force decrease with viscosity. Moreover, the effective interface energy varies nonlinearly with the voltage, realizing real-time adjustment of the adhesion force of the droplet/liquid-infused surface. The adhesion behaviors of droplet/liquid-infused surface can be actively/passively controlled by changing the voltage and the viscosity of the lubricant. Results help to provide theoretical and technical guidance for development of a new micro-droplet controlling method. |
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