| Summary: | 碩士 === 國立臺北科技大學 === 環境工程與管理研究所 === 101 === Nanoparticle (dp≦100 nm) charging plays an important role in both scientific studies and practical applications related to aerosols, such as nano-structure patterning, contamination control, and aerosol instrumentation. However, the average charges of nanoparticle might be below one elementary charge. Therefore, it is necessary to improve the charge efficiency of nanoparticle.
A charge system was set up in this study, including aerosol generator system and unipolar ion generator. The objectives of this research were to study the average charges of particle, particle charge distribution, particle loss and ozone concentration at different ion air flow rate.
The experiment results indicated that the charge of nanoparticle increased with increasing air flow rate. When the air flow rate was 2lpm, the charge of 20, 50, and 80nm particle was above one elementary charge. Besides, the +3 charges distribution of 80nm could be produced because of more ion attached to the larger surface area of particles. All the charged particle loss was less than 25% due to the image force. In addition, the coulomb force effect could be neglect as using the unipolar ion generator in this research. However, the unipolar ion generator had higher electric field that caused higher ozone concentration exhaust.
|
|---|
