抄録
Electrodynamic balance (EDB) is powerful tool for the investigation of the chemical reaction of a fine particle with gaseous species. But EDB apparatus is not suitable for following the fast reaction of a fine particle, because it takes several seconds to set a fine particle at null point at where particle gravity force is balanced with electric force of the charged particle by DC voltage applied to EDB. This study is to propose a simple numerical method for determination of fast weight change by the reaction between a single particle and gaseous species in EDB.
The electric fields in EDB were calculated by MATLAB partial differential equation (PDE) tool and an approximate equation of electric field along the central axis of double cylindrical electrodes of EDB was obtained with time. By adjusting the change of a particle weight to be close agreement between the experimentally observed oscillation patterns of the particle into EDB and numerical calculation result of vertical differential equation of a particle motion, we can follow the process of reaction of a particle with gaseous species quantitatively. In this paper, it was found that the particle oscillation followed up the weight change within a few oscillations and it has been demonstrated that trajectory calculation of a particle in EDB is very useful for the kinetic studies for reaction of a single aerosol particle with gaseous species.
