液-液相分离在单悬浮气溶微滴中
1Key Laboratory for the Physics and Chemistry of Nanodevices, School of Electronics, Peking University, Beijing 100871, China.
Analytical chemistry
|August 9, 2023
概括
气溶中的液体液相分离 (LLPS) 对大气过程产生影响. 这项研究使用激光子来显示酸度和盐如何影响单个气溶微滴中的LLPS.
科学领域:
- 大气化学 大气化学
- 物理化学 物理化学
- 频谱学是一种光谱学.
背景情况:
- 液-液相分离 (LLPS) 是环境气溶中常见的现象.
- LLPS显著影响气溶的物理化学特性和大气过程,如质量转移和异质反应.
- 由于实验的局限性,研究单个悬浮气溶中的LLPS具有挑战性.
研究的目的:
- 在个别的无接触微滴中研究LLPS.
- 了解气溶在湿度周期中的动态形态变化.
- 探索pH值和无机成分对气溶LLPS的影响.
主要方法:
- 使用了一种自制的激光针/拉曼光谱系统.
- 光学捕获的单个微滴模仿悬浮气溶.
- 采用时间解析腔增强拉曼光谱来监测动态变化.
主要成果:
- 在湿度周期下观察到光学捕获滴的动态形态变化.
- 发现酸度增加增加了可混合性,降低了分离相对湿度.
- 证明无机成分根据它们的盐分能力影响气溶相位状态.
结论:
- 单个气溶中的LLPS可以使用激光针/拉曼光谱学来研究.
- 酸性和无机盐在调节气溶LLPS中起着至关重要的作用.
- 这些发现对理解大气颗粒的形态学有意义,特别是混合无机有机气溶.
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