Topic status: We're looking for students to study this topic.
The presence of ions and ultrafine particles in the urban environment has been a concern for the last decades of years, as it has been suggested that they may affect the ambient air quality and link to a range of adverse health effects. However, there is still limited knowledge on their concentrations and interactions in different types of urban environments, and their dominant sources.
Hypothesis/Aims: The aim of this experiment will be to investigate how the dissipation rates of fine particles in the air by various processes such as deposition and coagulation are affected by electrical charge on these particles. You will develop simple theoretical models for these processes and test them using your experimental results.
Approaches: This project will be carried out in a large closed chamber in the laboratory into which you will introduce aerosol particles from a number of different sources such as cigarette smoke and vehicle emissions. Once a stable aerosol cloud is obtained, the particles will be charged using a commercially available negative ion generator. You will monitor the particle number concentration, charged particle concentration and air ion concentration in real time.