水蒸汽在凹凸颗粒上非均匀成核的微观可视化

IF 2.9 3区 环境科学与生态学 Q2 ENGINEERING, CHEMICAL
Li Lv , Yixun Lu , Junchao Xu , Xing Wu , Guangze Li , Longfei Chen
{"title":"水蒸汽在凹凸颗粒上非均匀成核的微观可视化","authors":"Li Lv ,&nbsp;Yixun Lu ,&nbsp;Junchao Xu ,&nbsp;Xing Wu ,&nbsp;Guangze Li ,&nbsp;Longfei Chen","doi":"10.1016/j.jaerosci.2025.106668","DOIUrl":null,"url":null,"abstract":"<div><div>Heterogeneous nucleation of water vapor on fine particles affects droplet formation in key processes such as atmospheric physics, gas purification, crystallization, and particle measurement. Understanding and predicting the preferential nucleation sites on microscale particles, especially those with complex geometries such as convex and concave surfaces, remains a major challenge. In this work, the nucleation process on convex spherical particles is first visualized. Particle gap, i.e. particle concavity, will preferentially nucleate. A planar gap model is constructed to explain the reason why convex particles are more prone to nucleate at the gap compared to the particle surface. The influences of the gap angle and the contact angle on nucleation are analyzed. The smaller the gap angle, the smaller the contact angle, and the lower the nucleation energy barrier, making nucleation more likely to occur. Compared to using fractal theory to only obtain the nucleation energy barriers, this model can be used to predict the preferential nucleation sites of micrometer sized convex spherical particles.</div><div>Importantly, to address the issue of whether all concavity will preferentially nucleate, the nucleation on micron-sized concave spherical particles is then visualized. And the nucleation energy barriers of concave cavities and particle surfaces with and without considering line tension are analyzed. It is found that when the particle radius and cavity radius are large, their energy barriers are almost the same. Water vapor is more likely to nucleate simultaneously inside the cavity and on the particle surface. When the particle radius and cavity radius are small, considering the line tension, the energy barrier inside the cavity is greater than that on the particle. Contrary to what is believed, water vapor is more likely to nucleate on the particle rather than in the cavity.</div></div>","PeriodicalId":14880,"journal":{"name":"Journal of Aerosol Science","volume":"190 ","pages":"Article 106668"},"PeriodicalIF":2.9000,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Microscopic visualization of heterogeneous nucleation of water vapor on convex and concave particles\",\"authors\":\"Li Lv ,&nbsp;Yixun Lu ,&nbsp;Junchao Xu ,&nbsp;Xing Wu ,&nbsp;Guangze Li ,&nbsp;Longfei Chen\",\"doi\":\"10.1016/j.jaerosci.2025.106668\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Heterogeneous nucleation of water vapor on fine particles affects droplet formation in key processes such as atmospheric physics, gas purification, crystallization, and particle measurement. Understanding and predicting the preferential nucleation sites on microscale particles, especially those with complex geometries such as convex and concave surfaces, remains a major challenge. In this work, the nucleation process on convex spherical particles is first visualized. Particle gap, i.e. particle concavity, will preferentially nucleate. A planar gap model is constructed to explain the reason why convex particles are more prone to nucleate at the gap compared to the particle surface. The influences of the gap angle and the contact angle on nucleation are analyzed. The smaller the gap angle, the smaller the contact angle, and the lower the nucleation energy barrier, making nucleation more likely to occur. Compared to using fractal theory to only obtain the nucleation energy barriers, this model can be used to predict the preferential nucleation sites of micrometer sized convex spherical particles.</div><div>Importantly, to address the issue of whether all concavity will preferentially nucleate, the nucleation on micron-sized concave spherical particles is then visualized. And the nucleation energy barriers of concave cavities and particle surfaces with and without considering line tension are analyzed. It is found that when the particle radius and cavity radius are large, their energy barriers are almost the same. Water vapor is more likely to nucleate simultaneously inside the cavity and on the particle surface. When the particle radius and cavity radius are small, considering the line tension, the energy barrier inside the cavity is greater than that on the particle. Contrary to what is believed, water vapor is more likely to nucleate on the particle rather than in the cavity.</div></div>\",\"PeriodicalId\":14880,\"journal\":{\"name\":\"Journal of Aerosol Science\",\"volume\":\"190 \",\"pages\":\"Article 106668\"},\"PeriodicalIF\":2.9000,\"publicationDate\":\"2025-08-12\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Aerosol Science\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0021850225001454\",\"RegionNum\":3,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENGINEERING, CHEMICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Aerosol Science","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0021850225001454","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0

摘要

水蒸气在细颗粒上的非均相成核影响着大气物理、气体净化、结晶和颗粒测量等关键过程中液滴的形成。了解和预测微尺度颗粒上的优先成核位点,特别是那些具有复杂几何形状(如凹凸表面)的颗粒,仍然是一个主要的挑战。在这项工作中,首次可视化了凸球形颗粒的成核过程。粒子间隙,即粒子凹度,将优先成核。构造了一个平面间隙模型来解释为什么凸粒子比粒子表面更容易在间隙处成核。分析了间隙角和接触角对成核的影响。间隙角越小,接触角越小,成核能势垒越低,更容易发生成核。与分形理论只能得到成核能势垒相比,该模型可以预测微米级凸球形颗粒的优先成核位。重要的是,为了解决是否所有凹面都会优先成核的问题,然后可视化了微米大小的凹面球形颗粒上的成核。分析了考虑线张力和不考虑线张力时凹腔和颗粒表面的成核能垒。发现当粒子半径和腔半径较大时,它们的能垒基本相同。水蒸气更有可能在空腔内和颗粒表面同时成核。当粒子半径和空腔半径较小时,考虑到线张力,空腔内的能垒大于粒子上的能垒。与人们所认为的相反,水蒸气更有可能在粒子上而不是在空腔中成核。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Microscopic visualization of heterogeneous nucleation of water vapor on convex and concave particles
Heterogeneous nucleation of water vapor on fine particles affects droplet formation in key processes such as atmospheric physics, gas purification, crystallization, and particle measurement. Understanding and predicting the preferential nucleation sites on microscale particles, especially those with complex geometries such as convex and concave surfaces, remains a major challenge. In this work, the nucleation process on convex spherical particles is first visualized. Particle gap, i.e. particle concavity, will preferentially nucleate. A planar gap model is constructed to explain the reason why convex particles are more prone to nucleate at the gap compared to the particle surface. The influences of the gap angle and the contact angle on nucleation are analyzed. The smaller the gap angle, the smaller the contact angle, and the lower the nucleation energy barrier, making nucleation more likely to occur. Compared to using fractal theory to only obtain the nucleation energy barriers, this model can be used to predict the preferential nucleation sites of micrometer sized convex spherical particles.
Importantly, to address the issue of whether all concavity will preferentially nucleate, the nucleation on micron-sized concave spherical particles is then visualized. And the nucleation energy barriers of concave cavities and particle surfaces with and without considering line tension are analyzed. It is found that when the particle radius and cavity radius are large, their energy barriers are almost the same. Water vapor is more likely to nucleate simultaneously inside the cavity and on the particle surface. When the particle radius and cavity radius are small, considering the line tension, the energy barrier inside the cavity is greater than that on the particle. Contrary to what is believed, water vapor is more likely to nucleate on the particle rather than in the cavity.
求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
Journal of Aerosol Science
Journal of Aerosol Science 环境科学-工程:化工
CiteScore
8.80
自引率
8.90%
发文量
127
审稿时长
35 days
期刊介绍: Founded in 1970, the Journal of Aerosol Science considers itself the prime vehicle for the publication of original work as well as reviews related to fundamental and applied aerosol research, as well as aerosol instrumentation. Its content is directed at scientists working in engineering disciplines, as well as physics, chemistry, and environmental sciences. The editors welcome submissions of papers describing recent experimental, numerical, and theoretical research related to the following topics: 1. Fundamental Aerosol Science. 2. Applied Aerosol Science. 3. Instrumentation & Measurement Methods.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信