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Liquid ToF-SIMS revealing the oil, water, and surfactant interface evolution.
Physical Chemistry Chemical Physics ( IF 3.3 ) Pub Date : 2020-03-02 , DOI: 10.1039/d0cp00528b Yanjie Shen 1 , Jenn Yao 1 , Jiyoung Son 1 , Zihua Zhu 2 , Xiao-Ying Yu 1
Physical Chemistry Chemical Physics ( IF 3.3 ) Pub Date : 2020-03-02 , DOI: 10.1039/d0cp00528b Yanjie Shen 1 , Jenn Yao 1 , Jiyoung Son 1 , Zihua Zhu 2 , Xiao-Ying Yu 1
Affiliation
Bilge water from ships is regarded as a major pollutant in the marine environment. Bilge water exists in a stable oil-in-water (O/W) emulsion form. However, little is known about the O/W liquid–liquid (l–l) interface. Traditional bulk characterization approaches are not capable of capturing the chemical changes at the O/W l–l interface. Although surfactants are deemed essential in droplet formation, their roles in bilge water stabilization have not been fully revealed. We have utilized novel in situ chemical imaging tools including in situ scanning electron microscopy (SEM) and in situ time-of-flight secondary ion mass spectrometry (ToF-SIMS) to study the evolving O/W interface using a NAVY bilge model for the first time. The droplet size distribution (DSD) does not change significantly without the addition of X-100 surfactants under static or rocking conditions. Both the oil components and the water clusters are shown to evolve over time at the O/W droplet interface by in situ liquid SIMS imaging. Of particular interest to droplet stabilization, the contribution of surfactants to the aged bilge droplets becomes more significant as the droplet size increases. The higher mass surfactant component does not appear on the droplet surface immediately while many lower mass surfactants are solvated inside the droplet. We have provided the first three-dimensional images of the evolving O/W interface and demonstrated that in situ surface chemical mapping is powerful enough to reveal the complex and dynamic l–l interface in the liquid state. Our observational insights suggest that surfactants are important in mediating droplet growth and facilitating effective separation of bilge water emulsion.
中文翻译:
液体ToF-SIMS揭示了油,水和表面活性剂界面的演变。
船舶的舱底水被认为是海洋环境中的主要污染物。舱底水以稳定的水包油(O / W)乳液形式存在。但是,关于O / W液-液(l-l)界面知之甚少。传统的批量表征方法无法捕获O / W 1-1界面的化学变化。尽管表面活性剂被认为在液滴形成中必不可少,但它们在舱底水稳定中的作用尚未完全揭示。我们已经利用了新颖的原位化学成像工具,包括原位扫描电子显微镜(SEM)和原位飞行时间二次离子质谱(ToF-SIMS)首次使用NAVY舱底模型研究不断发展的O / W界面。在静态或摇摆条件下,如果不添加X-100表面活性剂,液滴尺寸分布(DSD)不会发生明显变化。无论是油组分和水簇被示出通过在O / W液滴界面随着时间而演变原位液体SIMS成像。对于液滴稳定特别感兴趣,随着液滴尺寸的增加,表面活性剂对老化的舱底液滴的贡献变得更加重要。较高质量的表面活性剂组分不会立即出现在液滴表面,而许多较低质量的表面活性剂则溶解在液滴内部。我们提供了演化中的O / W界面的第一个三维图像,并证明了原位表面化学作图的功能足以揭示液态复杂而动态的l-1界面。我们的观察结果表明,表面活性剂在介导液滴生长和促进有效分离舱底水乳液方面很重要。
更新日期:2020-03-02
中文翻译:
液体ToF-SIMS揭示了油,水和表面活性剂界面的演变。
船舶的舱底水被认为是海洋环境中的主要污染物。舱底水以稳定的水包油(O / W)乳液形式存在。但是,关于O / W液-液(l-l)界面知之甚少。传统的批量表征方法无法捕获O / W 1-1界面的化学变化。尽管表面活性剂被认为在液滴形成中必不可少,但它们在舱底水稳定中的作用尚未完全揭示。我们已经利用了新颖的原位化学成像工具,包括原位扫描电子显微镜(SEM)和原位飞行时间二次离子质谱(ToF-SIMS)首次使用NAVY舱底模型研究不断发展的O / W界面。在静态或摇摆条件下,如果不添加X-100表面活性剂,液滴尺寸分布(DSD)不会发生明显变化。无论是油组分和水簇被示出通过在O / W液滴界面随着时间而演变原位液体SIMS成像。对于液滴稳定特别感兴趣,随着液滴尺寸的增加,表面活性剂对老化的舱底液滴的贡献变得更加重要。较高质量的表面活性剂组分不会立即出现在液滴表面,而许多较低质量的表面活性剂则溶解在液滴内部。我们提供了演化中的O / W界面的第一个三维图像,并证明了原位表面化学作图的功能足以揭示液态复杂而动态的l-1界面。我们的观察结果表明,表面活性剂在介导液滴生长和促进有效分离舱底水乳液方面很重要。