Evaluation of a soft X-ray unipolar charger for charging nanoparticles
Evaluation of a soft X-ray unipolar charger for charging nanoparticles
复制标题
用于为纳米颗粒充电的软 X 射线单极充电器的评估
DOI：
10.1007/s11051-010-0052-x
复制
发表时间：
2011
影响因子：
2.5
通讯作者：
Kihong Park
中科院分区：
文献类型：
--
作者：
D. Kim;Y. M. Kim;Y. Kwon;Kihong Park
三种类型的单极充电器（平行多电极，单电极，单电极与紧凑的尺寸）使用软X射线构建和他们的充电性能进行了评估，通过测量正，负，和中性分数的尺寸分辨超细颗粒（20-100 nm）与串联微分迁移率分析仪（TDMA）技术。单极充电器与一个单一的电极和紧凑的尺寸表现出最高的电荷分数与最少的颗粒损失可能是由于较低的静电损失的离子之间的测试充电器。在电极上施加正电压以去除负离子的情况下，我们发现对于20、30、50、70和100 nm的颗粒，带正电的颗粒分别为43、52、62、69和75%，并且少数颗粒带负电，尽管它们的比例随着尺寸的增加而增加（对于20、30、50、70和100-nm颗粒，分别为1、2、4、5和6%）。正电荷分数比从双极充电器理论上估计的值高约三倍。此外，基于使用电晕放电单极充电器的电流数据与先前报道的值的比较，软X射线充电器在充电效率和对当前在20-100 nm的粒度范围内测试的颗粒（NaCl）的渗透方面显示出更好的性能。
Three types of unipolar chargers (parallel multi-electrodes, single electrode, and single electrode with compact size) using the soft X-ray were constructed and their charging performance was evaluated by measuring positive, negative, and neutral fractions of size-resolved ultrafine particles (20–100 nm) with the Tandem Differential Mobility Analyzer (TDMA) technique. The unipolar charger with a single electrode and compact size showed the highest charge fraction with least particle loss probably due to lower electrostatic loss of ions among tested chargers. With positive voltage applied to electrode to remove negative ions, we found that the positively charged particles were 43, 52, 62, 69, and 75% for 20, 30, 50, 70, and 100-nm particles, respectively, and a few particles were negatively charged although their fraction increased with size (1, 2, 4, 5, and 6% for 20, 30, 50, 70, and 100-nm particles, respectively). The positive charge fractions were about three times higher than the values estimated theoretically from a bipolar charger. Also, based on comparison of current data with previously reported values using corona discharge unipolar charger, the soft X-ray charger showed better performance in terms of charging efficiency and penetration for particles (NaCl) currently tested in the particle size range of 20–100 nm.