论文标题

物理化学对表面气泡中膜变薄的影响

Impact of physical-chemistry on the film thinning in surface bubbles

论文作者

Pasquet, Marina, Boulogne, François, Saint-Anna, Julien, Restagno, Frédéric, Rio, Emmanuelle

论文摘要

在本文中,我们通过考虑液体浴中使用的物理化学化学的作用来研究蒸发表面活性剂稳定的表面气泡的变薄动力学。我们研究表面活性剂浓度下方和高于CMC(临界胶束浓度)的影响以及环境湿度的作用。首先,在湿度饱和的气氛中,我们表明,如果初始厚度取决于表面活性剂的浓度并受到表面弹性的限制,则排水动力学从毛细管和重力贡献中得到很好的描述。这些动力学与表面活性剂浓度无关。在第二部分中,我们的研究表明,物理化学通过蒸发影响了变薄的动力学。我们在模型中包括由于蒸发而产生的其他贡献,这显示了CMC下面的实验数据的良好描述。在CMC上方,尽管该模型在短时间内并不令人满意,但长时间的动力学是正确渲染的,我们确定表面活性剂浓度的增加会降低蒸发的影响。最后,我们的模型也可以合理化吸湿化合物甘油的添加。我们证明甘油在环境湿度下降低了气泡变薄速率,从而提高了其稳定性。

In this paper, we investigate the thinning dynamics of evaporating surfactant-stabilised surface bubbles by considering the role of the physical-chemistry of solutions used in the liquid bath. We study the impact of the surfactant concentration below and above the cmc (critical micelle concentration) and the role of ambient humidity. First, in a humidity-saturated atmosphere, we show that if the initial thickness depends on the surfactant concentration and is limited by the surface elasticity, the drainage dynamics are very well described from the capillary and gravity contributions. These dynamics are independent of the surfactant concentration. In a second part, our study reveals that the physical-chemistry impacts the thinning dynamics through evaporation. We include in the model the additional contribution due to evaporation, which shows a good description of the experimental data below the cmc. Above the cmc, although this model is unsatisfactory at short times, the dynamics at long times is correctly rendered and we establish that the increase of the surfactant concentration decreases the impact of evaporation. Finally, the addition of a hygroscopic compound, glycerol, can be also rationalized by our model. We demonstrate that glycerol decreases the bubble thinning rate at ambient humidity, thus increasing their stability.

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