接触线冰核化是水在宏观和微观聚烯表面的主导结机制
Paul Bieber1, Teresa M Seifried1, William Bae1
1Department of Chemistry, University of British-Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
Langmuir : the ACS journal of surfaces and colloids
|November 17, 2025
概括
水塑料上的冰核形成主要始于三相接触线,而不是接口. 了解接触线热力学可以预测塑料和其他疏水材料的结温度.
科学领域:
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
- 表面科学是一门学科.
背景情况:
- 在疏水表面上形成冰核对于飞机结冰和冷保存等应用至关重要.
- 预测塑料上的结是具有挑战性的,因为核化地点 (接口与接触线) 的不确定性.
研究的目的:
- 在宏观和微观聚烯塑料上研究冰核形成的发病地点.
- 要区分接口和接触线结机制.
主要方法:
- 高速视频摄影 (≥2100 fps) 来观察结的开始.
- 在流下冷却周期的接触角度测量.
- 在不同滴滴大小 (10μL,1μL,5nL) 的聚烯板和纤维上结的分析.
主要成果:
- 接触线核化占主导地位,在90%的病例中观察到10μL滴在平面聚烯上.
- 滴滴接触角度随着冷却而降低,表明了一个固定的接触线.
- 接触线核化比聚烯微纤维的接口核化频率高3.5倍.
结论:
- 聚烯板和纤维在三相接触线上表现出对冰核形成的强烈偏好.
- 了解接触线热力学是预测疏水表面结行为的关键.
相关概念视频
01:20Anionic Chain-Growth Polymerization: Overview
2.5K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.5K
01:27Frost Action on Concrete
384
Concrete structures in cold climates, such as those along roadsides, can retain moisture. This moisture makes them susceptible to frost-related damage when temperatures fall below freezing. Adding moisture worsens the damage during temperature fluctuations, leading to repeated freezing and thawing. De-icing salts, spread over these structures to melt ice, add to the freeze-thaw cycle, and draw even more moisture into the concrete.
This freeze-thaw cycle primarily causes surface scaling, where...
This freeze-thaw cycle primarily causes surface scaling, where...
384