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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Ion-induced nucleation of dibutyl phthalate vapors on spherical and nonspherical singly and multiply charged polyethylene glycol ions
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Ion-induced nucleation of dibutyl phthalate vapors on spherical and nonspherical singly and multiply charged polyethylene glycol ions

机译：离子诱导的球形和非球形邻苯二甲酸二丁酯蒸气的成核和多电荷聚乙二醇离子的成核

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摘要

Dibutyl phthalate vapor nucleation induced by positive polyethylene glycol (PEG) ions with controlled sizes and charges was experimentally studied. The ions were produced by electrospray ionization, classified in a high-resolution differential mobility analyzer, and studied in a nano condensation nucleus counter of the mixing type. Ionic radii of PEG varied from 0.52 to 1.56 nm, including from singly to quadruply charged ions. Some of these ions are fully stretched chains, other are spherical, and others have intermediate forms, all of them having been previously characterized by mobility and mass spectrometry studies. Activation of PEG(1080)(+2) requires a supersaturation almost as high as that required for small singly charged ions and higher than for PEG(1080)(+). This anomaly is explained by the Coulombic stretching of the ion into a long chain, where the two charged centers appear to be relatively decoupled from each other. The critical supersaturation for singly charged spherical ions falls below Thomson's (capillary) theory and even below the already low values seen previously for tetraheptyl ammonium bromide clusters. Spherical PEG(4120)(+2) falls close to the Thomson curve. The trends observed for slightly nonspherical PEG(4120)(+3) and highly nonspherical (but not quite linear) PEG(4120)(+4) are intermediate between those of multiply charged spheres and small singly charged ions.
机译：实验研究了由正聚乙二醇（PEG）离子诱导的邻苯二甲酸二丁酯气相成核，其大小和电荷均受控。离子是通过电喷雾电离产生的，在高分辨率差分迁移率分析仪中分类，并在混合型纳米缩合核计数器中进行研究。 PEG的离子半径在0.52至1.56 nm之间变化，包括从单电荷到四电荷的离子。这些离子中的一些是完全拉伸的链，另一些是球形的，而其他则具有中间形式，所有这些离子先前都已通过迁移率和质谱研究进行了表征。 PEG（1080）（+ 2）的激活要求过饱和度几乎与小单电荷离子所需的过饱和度一样高，并且比PEG（1080）（+）更高。这种异常现象是通过离子将库仑拉伸成长链来解释的，在该长链中，两个带电中心似乎相对解耦。单电荷球形离子的临界过饱和度低于Thomson（毛细管）理论，甚至低于先前对于四庚基溴化铵簇而言已经很低的值。球形PEG（4120）（+ 2）接近Thomson曲线。观察到的趋势是，稍呈非球形的PEG（4120）（+ 3）和高度非球形（但不是很线性）的PEG（4120）（+ 4）介于多电荷球体和小的单电荷离子之间。

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