化工学报 ›› 2022, Vol. 73 ›› Issue (4): 1673-1682.doi: 10.11949/0438-1157.20211666

• 表面与界面工程 • 上一篇    下一篇

浸没状态下的低压电润湿行为研究

常楚鑫1(),徐黎婷1,殷嘉伦1,雒先2,贾洪伟1()   

  1. 1.东华大学环境科学与工程学院，上海 201620
    2.中核工程咨询有限公司，北京 100073
  • 收稿日期:2021-11-19 修回日期:2021-12-25 出版日期:2022-04-05 发布日期:2022-04-25
  • 通讯作者: 贾洪伟 E-mail:4452479@163.com;jiahw@dhu.edu.cn
  • 作者简介:常楚鑫（1998—），男，硕士研究生，4452479@163.com
  • 基金资助:
    国家自然科学基金项目(52006030);上海市青年科技英才“扬帆计划”项目(18YF1400700);中国博士后基金项目(2018M641891);上海市科委科技攻关计划项目(19DZ1205005)

Study on low voltage electrowetting behavior under immersion state

Chuxin CHANG1(),Liting XU1,Jialun YIN1,Xian LUO2,Hongwei JIA1()   

  1. 1.College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
    2.China Nuclear Engineering Consulting Co. , Ltd. , Beijing 100073, China
  • Received:2021-11-19 Revised:2021-12-25 Published:2022-04-05 Online:2022-04-25
  • Contact: Hongwei JIA E-mail:4452479@163.com;jiahw@dhu.edu.cn

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摘要：

对表面活性剂溶液中的浸没气泡/油滴在低压电场作用下的电润湿行为进行了实验研究。分析了活性剂对低压电润湿特性的影响，探讨了电场作用下浸没气泡/油滴形态的演变规律。实验结果表明，通过添加十二烷基三甲基溴化铵（DTAB）或十二烷基硫酸钠（SDS）活性剂，浸没气泡可在低压电场（0 ~ -6 V）作用下实现接触角减小与气泡滑移，并且增加活性剂浓度可以降低气泡滑移所需的电压。在0.05~0.10 临界胶束浓度（CMC）范围内，DTAB溶液中的浸没油滴呈现较好的电润湿特性，银表面在-3 V电压时即可实现水下超疏油特性（接触角θ<30°）。在电润湿过程中，气泡/油滴的接触角和接触直径随时间逐渐减小，并呈现“慢-快-慢”变化形式。此外，浸没油滴形态也受到离子活性剂在界面吸附带电引起的静电力的影响。

关键词: 电润湿, 表面活性剂, 接触角, 浸没气泡

Abstract:

The electrowetting behavior of captive bubble/oil-droplet in the surfactant solution in a low-voltage electric field is investigated experimentally. The effect of the surfactant on the electrowetting characteristics was analyzed, and the evolution of immersed bubble/oil-droplet under electric field was explored. The experimental results show that by adding N,N,N-trimethyl-1-dodecanaminium bromide(DTAB) or sodium dodecyl sulfate(SDS), contact angle reduction and bubble slip can occur in low-voltage (0 — -6 V). In addition, the increase of the surfactant concentration could reduce the voltage required for bubble slip. In a concentration of 0.05 CMC to 0.10 CMC, the captive oil-droplet in the DTAB solution presents good electrowetting performance, and the silver surface could achieve underwater superoleophobic property with θ < 30° at -3 V. Moreover, in the process of electrowetting, the contact angle and contact diameter of the bubbles/oil-droplets both gradually decrease in form of “slow-fast-slow”. The shape of the captive oil-droplet is found to be affected by the electrostatic force caused by the adsorption and charging of the ionic surfactant at the interface.

Key words: electrowetting, surfactants, contact angle, captive bubble

中图分类号: 

  • O 647

表1

本研究中使用的表面活性剂"

活性剂

种类

离子类型胶束浓度/(mmol/L)分子量分子式
SDS阴离子8.2288.38C12H25SO4Na
DTAB阳离子14.5308.34C15H34BrN

图1

基于掳泡法的电润湿实验测量系统"

图2

不同电压下浸没气泡/油滴的接触角变化量"

图3

不同浓度活性剂溶液中的电润湿曲线"

表2

不同浓度活性剂溶液中气泡（或油滴）在滑移（或饱和）的表面电压及接触角变化值"

组合浓度/ CMCUsa或Usl / V?θ/(°)
DTAB 溶液/油滴0.05-4.0-55.40
0.10-3.0-43.62
0.20-4.0-39.43
DTAB溶液/气泡0.01-6.0-30.60
0.05-2.5-29.92
0.10-2.5-27.18
0.20-1.5-22.15
SDS 溶液/油滴0.10-7.0-26.68
0.20-7.0-24.05
0.30-5.0-21.51
SDS溶液/气泡0.05> -6.0—
0.10-4.5-25.17
0.20-3.0-15.74
0.30-2.5-7.61

图4

电润湿过程中气泡和油滴的形态 (体积约为4 μl)"

图5

接触角θ和接触直径d随时间的变化"

图6

浸没油滴受力情况及电润湿前后的图像"

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