Ling Xiangyang, Mayer Alexander, Yang Xingshi, Bournival Ghislain, Ata Seher
School of Minerals and Energy Resources Engineering, University of New South Wales, Sydney, NSW 2052, Australia.
Langmuir. 2021 Mar 30;37(12):3648-3661. doi: 10.1021/acs.langmuir.1c00012. Epub 2021 Mar 21.
The motion of particles in a monolayer induced by the coalescing of a bare bubble with a planar air-water interface was investigated in a modified Langmuir trough. Experiments were performed to understand the effect of particle hydrophobicity, subphase pH, packing density, the presence of a weak surfactant, and particle size distribution on the behavior of particle movement in the monolayer during the coalescence process. Video tracking software was used to track the particles and extract data based on the video footage. Visual inspection indicated that the coalescence of the bubble with the monolayer was a chaotic process which led the interface to oscillate to an extent that the particles underwent complete rearrangement. A simple analysis was carried out on the main forces involved in particle motion and rearrangement at the oscillating air-water interface. The motion characteristic of particles was evaluated by speed and mean-square displacement (MSD). The results showed that the butanol-treated particles had higher speed and MSD than the particles with a stronger affinity to the air-water interface. Similar results were also found at high subphase pH and low packing factor.
在一个经过改进的朗缪尔槽中，研究了裸气泡与平面空气 - 水界面合并时单层中颗粒的运动情况。进行了实验，以了解颗粒疏水性、亚相pH值、堆积密度、弱表面活性剂的存在以及颗粒尺寸分布对合并过程中单层内颗粒运动行为的影响。使用视频跟踪软件来跟踪颗粒并根据视频片段提取数据。目视检查表明，气泡与单层的合并是一个混沌过程，导致界面振荡到一定程度，使得颗粒发生完全重排。对振荡的空气 - 水界面处颗粒运动和重排所涉及的主要力进行了简单分析。通过速度和均方位移（MSD）评估颗粒的运动特性。结果表明，与对空气 - 水界面具有更强亲和力的颗粒相比，经丁醇处理的颗粒具有更高的速度和MSD。在高亚相pH值和低堆积因子下也发现了类似结果。
