法国巴黎文理研究大学Jérme Bibette研究团队报道了薄的粘接油膜导致油中水的混合物异常稳定。相关研究成果发表在2024年4月12日出版的《科学》。

油和水只能通过将一种流体的液滴分散在另一种流体中来混合。当两个液滴相互靠近时，分离它们的薄膜总是变得不稳定，导致液滴聚结。避免这种不稳定性的唯一已知方法是通过添加第三种组分，通常是表面活性剂，将薄膜稳定在其平衡厚度。

研究人员报道了一个观察结果，即分离两个水滴的薄油液膜可以导致水滴之间的粘附相互作用。此外，在不使用任何表面活性剂或溶剂的情况下，这种相互作用可以防止它们在数周的时间内聚结。

附：英文原文

Title: Thin adhesive oil films lead to anomalously stable mixtures of water in oil

Author: Claire Nannette, Jean Baudry, Anqi Chen, Yiqiao Song, Abdulwahed Shglabow, Nicolas Bremond, Damien Démoulin, Jamie Walters, David A. Weitz, Jérme Bibette

Issue&Volume: 2024-04-12

Abstract: Oil and water can only be mixed by dispersing droplets of one fluid in the other. When two droplets approach one another, the thin film that separates them invariably becomes unstable, causing the droplets to coalesce. The only known way to avoid this instability is through addition of a third component, typically a surfactant, which stabilizes the thin film at its equilibrium thickness. We report the observation that a thin fluid film of oil separating two water droplets can lead to an adhesive interaction between the droplets. Moreover, this interaction prevents their coalescence over timescales of several weeks, without the use of any surfactant or solvent.

DOI: adj6728

Source: https://www.science.org/doi/10.1126/science.adj6728