DEVELOPMENT OF ION MOBILITY SPECTROMETER AND ELECTRIC-IONIZER BASED AEROSOL CHARGER

• Main Author: Saputra, Casmika
• Format: Dissertations
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/63752
• Institution: Institut Teknologi Bandung

Aerosols are among the most important and widely studied fields, both in science, technology, industry, and even health. Aerosol can have contained viable (bioaerosol) and radioactive (radioactive aerosol) components. As air pollutants, aerosols can pose a threat to health. However, as an inhaler, aerosols can be used for drugs delivery. Physically, the characteristics of aerosols depend on their morphology and particle size. We can measure particle size in various ways, such as using the scanning mobility particle sizer (SMPS). However, SMPS works by utilizing the electric mobility method, in which the aerosol particles being measured must have a single (elementary) charge. An ion-source device is required, known as an aerosol charger, to create a singly charged aerosol particle. The ions produced by the aerosol charger are used to charge the particles. Thus, information on the characteristics of the ions produced by aerosol chargers is essential to observe. Therefore, we developed an ion mobility spectrometer (IMS) and an aerosol charger in this study. We then used the developed IMS to measure the mobility distribution of ions produced by the developed aerosol charger. In this study, IMS performance is investigated using experimental and simulation approaches. The results show that the developed IMS can measure ions with an electrical mobility range of 0.206 – 34.380 cm2/V/s at a sheath air flow rate of 20 L/min. IMS resolution is quite good, where the IMS measurement results can be used to investigate the distribution of ions produced by several types of ionizing sources. In this study, we developed an aerosol charger developed aerosol charger has a penetration ratio of both particles: 0.75 and 0.774, respectively. The developed aerosol charger has intrinsic and extrinsic charging efficiency, at particle sizing of 100 nm, up to 19% and 41%, respectively. This study also discusses the problem of new particle generation and charge fraction generated by aerosol chargers.