Negatively charged nanoparticles produced by splashing of water
Negatively charged nanoparticles produced by splashing of water
复制标题
溅水产生带负电的纳米粒子
DOI：
10.5194/acp-9-357-2009
复制
发表时间：
2008
影响因子：
6.3
通讯作者：
M. Kulmala
中科院分区：
文献类型：
--
作者：
H. Tammet;U. Hõrrak;M. Kulmala
抽象的。在模拟暴雨的实验室实验中，用迁移率光谱的方法研究了大气中溅射产生的气球电中间离子的产生。中间离子与β射线产生的团簇离子的部分中和抑制了中间离子的空间电荷，但保留了迁移率分布的形状。高TDS(总溶解固形物)的自来水产生的气电离子与低TDS的雨水产生的离子具有相同的迁移率。这表明球电离子可以被认为是单电荷的水纳米颗粒。通过不同的测量，这些粒子的直径模式为2.2-2.7 nm，接近卓别林的280分子魔力二十面体超团簇的直径2.5 nm。这些测量可以用一个假设来解释，即由于纳米粒子的内部结构接近2.5纳米，所以纳米粒子表面上的饱和水蒸气的压力被抑制了几个数量级。大气中气球电离子浓度爆发的记录在形式上与成核爆发的记录相似，但由于粒子不是在增长而是在收缩，因此不能被称为成核爆发。
Abstract. The production of splashing-generated balloelectric intermediate ions was studied by means of mobility spectrometry in the atmosphere during the rain and in a laboratory experiment simulating the heavy rain. The partial neutralization of intermediate ions with cluster ions generated by beta rays suppressed the space charge of intermediate ions but preserved the shape of the mobility distribution. The balloelectric ions produced from the waterworks water of high TDS (Total Dissolved Solids) had about the same mobilities as the ions produced from the rainwater of low TDS. This suggests that the balloelectric ions can be considered as singly charged water nanoparticles. By different measurements, the diameter mode of these particles was 2.2–2.7 nm, which is close to the diameter of 2.5 nm of the Chaplin's 280-molecule magic icosahedron superclusters. The measurements can be explained by a hypothesis that the pressure of saturated vapor over the nanoparticle surface is suppressed by a number of magnitudes due to the internal structure of the particles near the size of 2.5 nm. The records of the concentration bursts of balloelectric ions in the atmosphere are formally similar to the records of the nucleation bursts but they cannot be qualified as nucleation bursts because the particles are not growing but shrinking.