Ice Nucleation in Periodic Arrays of Spherical Nanocages
Ice Nucleation in Periodic Arrays of Spherical Nanocages
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DOI：
10.1021/acs.jpcc.7b08490
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发表时间：
2017-10
影响因子：
3.7
通讯作者：
S. Mascotto;W. Janke;R. Valiullin
中科院分区：
文献类型：
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作者：
S. Mascotto;W. Janke;R. Valiullin
一种硅质材料，含有大量的球形纳米笼连接到彼此的小微孔阵列，用于研究冰成核在承压水条件下，明确的孔隙几何形状。通过有目的地选择小于2nm的小尺寸的互连孔，冰成核和生长被限制为仅发生在纳米笼内。利用核磁共振技术，精确测量了不同温度下的冰核化速率。获得的这些速率基本上高于通常观察到的空气中微米大小的水滴的速率。此外，观察到一个纳米笼中的冰成核与相邻笼中的相态之间的相关性的发生。这些结果对于更深入地理解冰成核，特别是在受限几何条件下的冰成核具有重要意义。
A silicious material containing massive array of spherical nanocages connected to each other by small micropores was used to study ice nucleation in confined water under conditions of well-defined pore geometry. By purposefully selecting small size of the interconnecting pores below 2 nm, ice nucleation and growth were limited to occur only within the nanocages. By exploitation of nuclear magnetic resonance, ice nucleation rates at different temperatures were accurately measured. These rates were obtained to be substantially higher than those typically observed for micrometer-sized water droplets in air. In addition, the occurrence of correlations between ice nucleation in one nanocage with the phase state in the adjacent cages were observed. These results have important implication for a deeper understanding of ice nucleation, especially in confined geometries.