Effect of Surfactant on Electrochemically Generated Surface Nanobubbles
Effect of Surfactant on Electrochemically Generated Surface Nanobubbles
复制标题
表面活性剂对电化学产生的表面纳米气泡的影响
DOI：
10.1021/acs.analchem.0c05067
复制
发表时间：
2021
影响因子：
7.4
通讯作者：
Zhang, Bo
中科院分区：
文献类型：
--
作者：
Suvira, Milomir;Zhang, Bo
表面活性剂模拟污染，对纳米气泡在电极表面的成核、稳定和生长起着重要的作用。在这里，我们利用单分子荧光显微镜作为一种灵敏的成像工具来监测表面活性剂存在下的纳米气泡的动力学。我们的结果表明，在电压扫描中，阴离子和非离子表面活性剂的存在提高了所有电位下纳米气泡的成核速度。荧光和电化学响应表明，在所有电压下，成功地降低了纳米气泡成核所需的临界气体浓度。此外，我们还证明了表面活性剂在气液界面的积累改变了荧光团与纳米气泡表面的相互作用。具体来说，荧光团强度和在纳米气泡表面的停留寿命的差异表明，纳米气泡的标记受到纳米气泡的性质(尺寸、形状等)的影响。以及气液界面的结构(表面活性剂电荷、疏水性等)。
Surfactants, mimics of contamination, play an important role in nanobubble nucleation, stability, and growth at the electrode surface. Herein, we utilize single-molecule fluorescence microscopy as a sensitive imaging tool to monitor nanobubble dynamics in the presence of a surfactant. Our results show that the presence of anionic and nonionic surfactants increase the rate of nanobubble nucleation at all potentials in a voltage scan. The fluorescence and electrochemical responses indicate the successful lowering of the critical gas concentration needed for nanobubble nucleation across all voltages. Furthermore, we demonstrate that the accumulation of surfactants at the gas–liquid interface changes the interaction of fluorophores with the nanobubble surface. Specifically, differences in fluorophore intensity and residence lifetime at the nanobubble surface suggest that the labeling of nanobubbles is affected by the nature of the nanobubble (size, shape, etc.) and the structure of the gas–liquid interface (surfactant charge, hydrophobicity, etc.).