表面活性剂对准静态超疏水表面气泡形成的影响。

IF 3.4 3区 医学 Q1 ENGINEERING, MULTIDISCIPLINARY
Hangjian Ling, John Ready, Daniel O'Coin
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引用次数: 0

摘要

实验研究了表面活性剂对超疏水表面气泡形成的影响。该气泡是在准静态状态下以恒定流量通过SHS上的小孔注入气体而产生的。表面活性剂1-戊醇与浓度C为0 ~ 0.08 mol/L的水混合,对应表面张力σ为72 ~ 43 mN/m。我们发现,随着C的增加,气泡脱离体积(Vd)和最大泡底半径(Rdmax)减小。表面活性剂浓度较低时,静态接触角θ0基本保持不变,Vd和Rdmax随表面张力降低而减小,并遵循Rdmax~σ1/2和Vd~σ3/2的标度规律。不同浓度下的气泡形状是自相似的。气泡高度、气泡底部半径、气泡顶点半径和气泡颈部半径均与毛细管长度成正比。而当表面活性剂浓度较高时,θ0大大降低,并且由于θ0降低和σ减小的共同作用,Vd和Rdmax降低。最后,我们发现表面活性剂除了降低作用在气泡上的力的大小外,对作用在气泡上的力的影响可以忽略不计,并且除了减少时间和长度尺度外,对气泡掐断动力学的影响很小。总的来说,我们的结果为复杂液体中复杂表面上的气泡形成提供了更好的理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of Surfactant on Bubble Formation on Superhydrophobic Surface in Quasi-Static Regime.

We experimentally studied the effect of a surfactant on bubble formation on a superhydrophobic surface (SHS). The bubble was created by injecting gas through an orifice on the SHS at a constant flow rate in the quasi-static regime. The surfactant, 1-pentanol, was mixed with water at concentration C ranging from 0 to 0.08 mol/L, corresponding to surface tension σ ranging from 72 to 43 mN/m. We found that as C increased, the bubble detachment volume (Vd) and maximum bubble base radius (Rdmax) decreased. For a low surfactant concentration, the static contact angle θ0 remained nearly constant, and Vd and Rdmax decreased due to lower surface tensions, following the scaling laws Rdmax~σ1/2 and Vd~σ3/2. The bubble shapes at different concentrations were self-similar. The bubble height, bubble base radius, radius at the bubble apex, and neck radius all scaled with the capillary length. For high surfactant concentrations, however, θ0 was greatly reduced, and Vd and Rdmax decreased due to the combined effects of reduced θ0 and smaller σ. Lastly, we found that the surfactant had a negligible impact on the forces acting on the bubble, except for reducing their magnitudes, and had little effect on the dynamics of bubble pinch-off, except for reducing the time and length scales. Overall, our results provide a better understanding of bubble formation on complex surfaces in complex liquids.

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来源期刊
Biomimetics
Biomimetics Biochemistry, Genetics and Molecular Biology-Biotechnology
CiteScore
3.50
自引率
11.10%
发文量
189
审稿时长
11 weeks
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