聚电解质
反离子
成核
化学物理
冰核
分子
材料科学
冰的形成
化学工程
化学
纳米技术
离子
聚合物
地质学
大气科学
工程类
有机化学
作者
Zhiyuan He,Wen Jun Xie,Zhenqi Liu,Guangming Liu,Zuowei Wang,Yi Qin Gao,Jianjun Wang
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2016-06-03
卷期号:2 (6)
被引量:134
标识
DOI:10.1126/sciadv.1600345
摘要
Heterogeneous ice nucleation (HIN) on ionic surfaces is ubiquitous in a wide range of atmospheric aerosols and at biological interfaces. Despite its great importance in cirrus cloud formation and cryopreservation of cells, organs, and tissues, it remains unclear whether the ion-specific effect on ice nucleation exists. Benefiting from the fact that ions at the polyelectrolyte brush (PB)/water interface can be reversibly exchanged, we report the effect of ions on HIN on the PB surface, and we discover that the distinct efficiency of ions in tuning HIN follows the Hofmeister series. Moreover, a large HIN temperature window of up to 7.8°C is demonstrated. By establishing a correlation between the fraction of ice-like water molecules and the kinetics of structural transformation from liquid- to ice-like water molecules at the PB/water interface with different counterions, we show that our molecular dynamics simulation analysis is consistent with the experimental observation of the ion-specific effect on HIN.
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