Comparison between an unipolar corona charger and a polonium-based bipolar neutralizer for the analysis of nanosized particles and biopolymers
Comparison between an unipolar corona charger and a polonium-based bipolar neutralizer for the analysis of nanosized particles and biopolymers
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DOI：
10.1166/jnn.2006.308
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发表时间：
2006-05-01
影响因子：
--
通讯作者：
Szymanski, WW
中科院分区：
文献类型：
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作者：
Laschober, C;Kaufman, SL;Szymanski, WW
在这项工作中，我们提出的结果，通过电晕为基础的单极充电单元的纳米粒子的充电效率。该装置设计用于替换商用电喷雾气雾剂发生器（TSI Mod 3480）中的Po-210双极充电器装置。充电效率已被调查的负和正的带电粒子的各种化学组成的尺寸范围在5和18 nm之间。研究发现，电晕电流是影响荷电效率的最重要的操作参数，在正电荷和负偏压电晕针的情况下，随着电晕电流的增加，带正电的气溶胶粒子产率迅速下降，而带负电的气溶胶粒子产率则随着电晕电流的增加而增加。提供适当的电晕设置的纳米粒子的电荷水平类似于这些获得了一个Po-210充电器被发现，在最佳电晕设置的单电荷粒子的产量被发现是两到四倍高的负和正粒子相比，双极充电。这种充电效率的提高直接增加了分析的灵敏度，并增强了需要充电的空气中纳米颗粒的所有测量和操作过程。
In this work we present results on the charging efficiency of nanoparticles by means of a corona based unipolar charging unit. This device was designed to replace a Po-210 bipolar charger unit in a commercial electrospray aerosol generator (TSI Mod 3480). The charging efficiency has been investigated for negative and positive charged particles of various chemical composition in the size range between 5 and 18 nm. The corona current has been found to be the most influential operation parameter on the charging efficiency With a positive electrospray droplet charge and a negatively-biased corona needle, a rapidly decreasing yield of singly positively charged aerosol particles with increasing corona current was found. An increasing yield of negatively charged particles was observed with increasing current of the corona process. Providing appropriate corona settings nanoparticles with charge levels similar to these obtained with a Po-210 charger were found. At optimal corona settings the yield of singly charged particles was found to be two to four times higher for negative and positive particles compared to bipolar charging. This gain in the charging efficiency increases directly the sensitivity of analysis and enhances all measurement and manipulation processes of airborne nanoparticles for which electrical charging is required.