通过电极变形量化转稳性气溶的表面张力
Vahid Shahabadi1, Benjamin Vennes1, Ryan Schmedding1
1Department of Atmospheric and Oceanic Sciences, McGill University, Montréal, QC, Canada.
Nature communications
|December 2, 2024
概括
这项研究引入了一种新型仪器,用于使用电场测量气溶微滴表面张力. 它准确地探测转移稳定的大气状态,这对于了解气溶的行为至关重要.
科学领域:
- 大气化学 大气化学
- 物理化学 物理化学
- 气溶科学 气溶科学
背景情况:
- 准确的表面张力数据对于大气气溶行为预测至关重要.
- 气溶通常存在于超稳定状态 (超冷/超和),这对于标准张力测量来说很困难.
- 现有的方法难以处理大量的样本和快速的相变.
研究的目的:
- 开发一种新型仪器,用于无接触地测量气溶微滴的表面张力.
- 为了在超稳定的大气条件下进行测量,包括超和状态.
- 为了克服大气气溶的传统张力计的局限性.
主要方法:
- 利用强大的电场来变形单个气溶微滴,这些微滴被在双束光学陷中.
- 采用拉曼散射和形态依赖共振来精确测量纳米尺度的形状变化.
- 在湿度控制的环境中运行,允许在各种水活动中进行测量.
主要成果:
- 在超和条件下成功测量了微滴的表面张力,这是一个数据稀缺的区域.
- 在可能进行比较的情况下,与现有数据证明一致.
- 对具有粘度超过10^2 Pa·s.的系统进行扩展的表面张力测量.
结论:
- 开发的仪器为研究气溶微滴表面张力提供了新的能力.
- 这种方法适用于转移稳定的大气条件和高粘度系统.
- 为大气模型提供关键数据,并了解气溶的形成和生长.
相关概念视频
Surface Tension and Surface Energy
1.3K
When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...
Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...
1.3K
Surface Tension of Fluid
231
Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
Surface tension varies...
231
Surface Tension, Capillary Action, and Viscosity
27.5K
Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
27.5K


