疏水性表面上超扩散和非超扩散三硅氧烷表面活性剂溶液动态润湿的开始和早期阶段

IF 2.5 Q3 CHEMISTRY, PHYSICAL Colloids and Interfaces Pub Date : 2024-01-02 DOI:10.3390/colloids8010005
V. Bertola
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引用次数: 0

摘要

我们通过实验研究了两种化学结构相似的商用三硅氧烷表面活性剂水溶液在不同疏水性表面上动态润湿的开始和早期阶段,其中一种表面活性剂表现出超展性,目的是研究与表面活性无关的展布动态。超展延是指表面活性剂溶液在表面上的展延能力超出热力学平衡所确定的状态,对超展延的研究已有 30 多年的历史,尽管其在农用化学品配方中有着重要的应用,但人们对其物理机理至今仍知之甚少。将 S233 和 S240 表面活性剂(赢创工业股份公司,德国埃森)溶解到重量浓度为 0.1% 的去离子水中,制备表面活性剂溶液。将表面活性剂溶液和纯水的液滴沉积在三个具有不同润湿性(水的平衡接触角在 55∘ 和 100∘ 之间)的水平基底上,并用高帧频照相机从下往上观察,以观察前进的接触线。通过数字图像处理,从高速视频中提取了液滴随时间变化的扩散比。结果表明,超扩散溶液表现出间歇性的扩散率以及接触线的特殊特征,而非超扩散溶液则没有这些特征。
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The Onset and Early Stages of Dynamic Wetting of Superspreading and Non-Superspreading Trisiloxane Surfactant Solutions on Hydrophobic Surfaces
The onset and early stages of dynamic wetting on different hydrophobic surfaces is investigated experimentally for aqueous solutions of two commercial trisiloxane surfacants of similar chemical structure, one of which exhibits superspreading behaviour, in order to investigate the spreading dynamics independently of the surface activity. Superspreading, or the ability of a surfactant solution to spread on a surface beyond the state determined by thermodynamic equilibrium, has been investigated for more than 30 years however its physical mechanism remains poorly understood to date despite its important applications in the formulation of agrochemicals. Surfactant solutions were prepared by dissolving S233 and S240 surfactants (Evonik Industries AG, Essen, Germany) into de-ionised water at a weight concentration of 0.1%. Drops of surfactant solutions and pure water were deposited on three horizontal substrates with different wettability (equilibrium contact angle of water ranging between 55∘ and 100∘), and observed from below with a high-frame rate camera to visualise the advancing contact line. The spreading ratio of drops as a function of time was extracted from high-speed videos by digital image processing. Results reveal that the superspreading solution exhibits an intermittent spreading rate, as well as peculiar features of the contact line, which are not observed for the non-superspreading solution, and confirm the superspreading effect becomes less significant when the surface energy of the substrate is decreased.
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来源期刊
Colloids and Interfaces
Colloids and Interfaces CHEMISTRY, PHYSICAL-
CiteScore
3.90
自引率
4.20%
发文量
64
审稿时长
10 weeks
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