Influence of the Dissolved Gas on the Interfacial Properties of Decane Surface Nanodroplets
Influence of the Dissolved Gas on the Interfacial Properties of Decane Surface Nanodroplets
复制标题
溶解气体对癸烷表面纳米液滴界面性质的影响
DOI：
10.1021/acs.langmuir.1c02626
复制
发表时间：
2022
期刊：
影响因子：
3.9
通讯作者：
Jun Hu
中科院分区：
文献类型：
--
作者：
Zhanli Geng;Limin Zhou;Zhou Fang;Jing Wang;Kaiwei Yuan;Lijuan Zhang;Jun Hu
近年来，表面纳米液滴因其在制备具有纳米结构的功能材料和微纳尺度的化学反应方面的潜力而受到广泛关注。尽管在油滴在水中自发乳化等重要过程中已经实现了水中溶解气体的作用，但它在表面纳米液滴在疏水界面的润湿行为中的作用在很大程度上被忽略了。在这里，我们重点研究了溶解气体对表面纳米液滴界面性质的影响，并表征了它们在不同空气饱和水样中的形态演变。结果表明，在空气过饱和的冷水中，表面纳米液滴的形貌几乎没有变化。然而，在去离子水中，它们的接触角首先逐渐减小，用脱气水置换后立即增大，最后随着时间的推移逐渐减小。此外，注入脱气水后，纳米液滴的表面张力也会发生类似的变化。我们认为这些变化是由于衬底界面上富集态气体的去除或还原引起的，其中表面疏水性发生了变化。我们的发现可以揭示纳米液滴在不同空气饱和水样中疏水表面的润湿行为，并启发表面纳米液滴的微观操纵和反应。
Surface nanodroplets have received extensive attention recently due to their potential in the fabrication of functional materials with nanostructures and chemical reactions at micro- and nanoscales. Although the effect of dissolved gas in water has been realized in some important processes such as spontaneous emulsification of oil droplets in water, its roles in the wetting behavior of surface nanodroplets at the hydrophobic interface have been largely neglected. Here, we focused on the influence of dissolved gas on the interfacial properties of surface nanodroplets and characterized their morphological evolution when exposed to different air-saturated water samples. Results indicated that the morphology of surface nanodroplets barely changed in air-oversaturated cold water. However, their contact angle first decreases gradually in deionized water, increases immediately after replacement with degassed water, and eventually decreases gradually with time. Furthermore, the surface tension of nanodroplets would change similarly after the injection of degassed water. We considered these changes to be caused by the removal or reduction of the enriched gas at the substrate interface, in which the surface hydrophobicity was changed. Our findings could shed some light on the wetting behavior of nanodroplets at the hydrophobic surface in different air-saturated water samples and inspire the microscale manipulation and reaction of surface nanodroplets.