Ice Nucleation Properties of Oxidized Carbon Nanomaterials.
Ice Nucleation Properties of Oxidized Carbon Nanomaterials.
复制标题
DOI：
10.1021/acs.jpclett.5b01096
复制
发表时间：
2015-08-06
期刊：
影响因子：
--
通讯作者：
Salzmann CG
中科院分区：
文献类型：
--
作者：
Whale TF;Rosillo-Lopez M;Murray BJ;Salzmann CG
非均质冰成核在许多领域，特别是大气科学中是一个重要的过程，但仍然知之甚少。所有已知的无机冰成核颗粒的尺寸相对较大，并且往往是亲水的。因此，碳纳米材料是否会使冰成核并不明显。然而，在本文中，我们表明，四种不同的水分散性碳纳米材料能够成核冰。测试的材料是羧化石墨烯纳米片、氧化石墨烯、氧化单壁碳纳米管和氧化多壁碳纳米管。羧化石墨烯纳米片的直径为1.30纳米，是迄今为止观察到的最小的成核冰实体之一。总的来说，发现碳纳米管比平坦的石墨烯物质更有效地使冰成核，并且较少氧化的材料比较多氧化的物质更有效地使冰成核。这些定义明确的碳纳米材料可能为弥合冰成核实验和计算研究之间的差距铺平道路。
Heterogeneous ice nucleation is an important process in many fields, particularly atmospheric science, but is still poorly understood. All known inorganic ice nucleating particles are relatively large in size and tend to be hydrophilic. Hence it is not obvious that carbon nanomaterials should nucleate ice. However, in this paper we show that four different readily water-dispersible carbon nanomaterials are capable of nucleating ice. The tested materials were carboxylated graphene nanoflakes, graphene oxide, oxidized single walled carbon nanotubes and oxidized multiwalled carbon nanotubes. The carboxylated graphene nanoflakes have a diameter of ∼30 nm and are among the smallest entities observed so far to nucleate ice. Overall, carbon nanotubes were found to nucleate ice more efficiently than flat graphene species, and less oxidized materials nucleated ice more efficiently than more oxidized species. These well-defined carbon nanomaterials may pave the way to bridging the gap between experimental and computational studies of ice nucleation.