Charged nanoparticle formation from humidified gases with and without dilute benzene under electron beam irradiation
Charged nanoparticle formation from humidified gases with and without dilute benzene under electron beam irradiation
复制标题
DOI：
10.1016/s0021-8502(03)00078-8
复制
发表时间：
2003-08-01
影响因子：
4.5
通讯作者：
Kojima, T
中科院分区：
文献类型：
--
作者：
Hakoda, T;Kim, HH;Kojima, T
通过电子束辐照空气、N2、O2和Ar等不同含水量的气体，研究了高密度自由基、离子和二次热化电子场中气溶胶的成核过程。通过配备有法拉第杯静电计的簇微分迁移率分析仪分析照射气体中的带电纳米颗粒。所有的加湿气体实验都形成了带正电和带负电的粒子。当量直径（D-m）范围为7-10 nm且具有相同数目浓度（N）的水离子簇以及D-m范围为1.0-1.1 nm的水离子簇。这些大颗粒的N随含水量和吸收剂量的增加而增加。实验结果表明，过氧化氢作为其一部分包含在这些大的带电粒子中。在ppbv级苯的存在下，大粒子的D-m和N随苯浓度的增加而增加，但D-m在不同浓度下保持不变。(C)2003 Elsevier Ltd.保留所有权利。
The nucleation of aerosols in a field of high-density free radicals, ions, and secondary thermalized electrons was studied by irradiating air, N-2, O-2, and Ar containing different water contents with electron beams. The charged nanoparticles in the irradiating gases were analyzed by a cluster differential mobility analyzer equipped with a Faraday cup electrometer. All experiments with humidified gases formed both positively and negatively charged particles with mean mobil. equiv. diameters (D-m) range of 7-10 nm and with the same number concentration (N) as well as water ion clusters with D-m range of 1.0-1.1 nm. The N of these large particles increased with water content and absorbed dose. The experimental result showed that hydrogen peroxide was contained in these large charged particles as its part. In the presence of ppbv-level benzene, the D-m and N of large charged particles increased with benzene concentration, although their D-m were constant at different doses. (C) 2003 Elsevier Ltd. All rights reserved.