物理化学对表面气泡膜减薄的影响
Impact of physical-chemistry on the film thinning in surface bubbles
摘要：
在本文中，我们研究蒸发表面稳定的表面气泡的变薄动力学考虑的作用，在液体浴中使用的解决方案的物理化学。我们研究了表面活性剂浓度低于和高于cmc（临界胶束浓度）的影响以及环境湿度的作用。首先，在一个湿度饱和的气氛中，我们表明，如果初始厚度取决于表面活性剂的浓度，并受到限制的表面弹性，排水动力学是很好地描述从毛细管和重力的贡献。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变薄动力学。我们包括在模型中的额外贡献，由于蒸发，这表明一个很好的描述低于临界胶束浓度的实验数据。在cmc以上，虽然该模型在短时间内不令人满意，但在长时间内的动态正确呈现，并且我们确定表面活性剂浓度的增加降低了蒸发的影响。最后，除了吸湿化合物，甘油，也可以合理化，我们的模型。我们证明，甘油降低了在环境湿度下的气泡变薄速率，从而增加了它们的稳定性。
英文摘要：
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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