title: Development and calibration of differential mobility analyzer for 20 to 80 nm particles under low pressure conditions.
abstract: The vienna-type differential mobility analyzer (DMA) was developed for the measurement of wide-range nm-sized particles under low-pressure conditions (2.9-8 kPa) with the faraday cup electrometer (FCE). The length, inner and outer diameter of DMA are calculated as a function of flow rate, applied voltage, pressure, and particle diameter to avoide breakdown in DMA. The algorithm for the diffusion transfer function of the DMA was successfully developed and verified by comparing the numerical and experimental results. The DMA was calibrated via the tandem DMA (TDMA) method which using two DMA in parallel. The inversion algorithm was applied to the size distribution obtained from the current of the FCE. The calibration experiment was performed with 1% NaCl particles under atmospheric and low-pressure conditions. The calibration result showed that the development of the DMA was successful as it was able to measure 20- to 80-nm paricles under low-pressure conditions with various flow rates (0.1-0.5 l/min).
authors: Sungkyunkwan Advanced Institute of Nano Technology, Sungkyunkwan University, Suwon 440-746, Republic of Korea.
authors: Ji Hun
authors: JH
authors: Mun
authors: Dae Guen
authors: DG
authors: Cho
authors: Young Jin
authors: YJ
authors: Kim
authors: Jae Boong
authors: JB
authors: Choi
authors: Sang Woo
authors: SW
authors: Kang
authors: Ju Young
authors: JY
authors: Yun
authors: Yong Hyeon
authors: YH
authors: Shin
authors: Tae Sung
authors: TS
authors: Kim