Li Danlong, Manica Rogerio, Chen Zhixiang, Wang Shuo, Liu Qingxia, Zhang Haijun
School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China.
Future Technology School, Shenzhen Technology University, Shenzhen 518118, China.
Proc Natl Acad Sci U S A. 2025 Feb 4;122(5):e2417043122. doi: 10.1073/pnas.2417043122. Epub 2025 Jan 27.
Bubbles present in saline water typically exhibit a prolonged lifetime, making them attractive for various engineering processes. Herein, we unveil a transition from delayed bubble coalescence to rapid bursting within about one millisecond in salty solutions. The key aspect in understanding this transition lies in the combined influences of surface deformation and ion surface excess instead of characterizing the ions alone. Only with a sufficiently deformed region trapped between the colliding bubble and fluid surfaces can the coalescence inhibition effect be maintained to cause the bouncing behavior. Thus, we quantify a consistent upper limit of ion transfer content required for instant coalescence under different salty conditions. Furthermore, we present numerical ranges associated with different bubble behaviors in terms of [Formula: see text], [Formula: see text], and [Formula: see text] and determine the critical values to predict bubble dynamics. Our findings shed light on the bubble coalescence principle in saline water and allow access to the regulation of coalescence time based on the requirement of technological applications.
盐水中存在的气泡通常具有较长的寿命，这使得它们在各种工程过程中具有吸引力。在此，我们揭示了在含盐溶液中，气泡在大约一毫秒内从延迟聚并转变为快速破裂的过程。理解这种转变的关键在于表面变形和离子表面过剩的综合影响，而不是仅对离子进行表征。只有在碰撞气泡和流体表面之间捕获到足够变形的区域时，才能维持聚并抑制效应以导致反弹行为。因此，我们量化了在不同含盐条件下即时聚并所需的离子转移含量的一致上限。此外，我们根据[公式：见正文]、[公式：见正文]和[公式：见正文]给出了与不同气泡行为相关的数值范围，并确定了预测气泡动力学的临界值。我们的研究结果揭示了盐水中气泡聚并的原理，并允许根据技术应用的要求来调节聚并时间。
