Browse/search for people

Publication - Professor Denis Henshaw

    Re-creation of aerosol charge state found near HV power lines using a high voltage corona charger

    Citation

    Matthews, J, Wright, M, Biddiscombe, M, Underwood, R, Usmani, O, Shallcross, D & Henshaw, D, 2015, ‘Re-creation of aerosol charge state found near HV power lines using a high voltage corona charger’. in: James Matthews (eds) Journal of Physics: Conference Series. IOP Publishing, BRISTOL, pp. 012044

    Abstract

    Corona ionisation from AC HV power lines (HVPL) can release ions into the environment, which have the potential to electrically charge pollutant aerosol in the atmosphere. It has been hypothesised that these charged particles have an enhanced probability of being deposited in human airways upon inhalation due to electrostatic attraction by image charge within the lung, with implications for human health. Carbonaceous aerosol particles from a Technegas generator were artificially charge-enhanced using a corona charger. Once generated, particles were passed through the charger, which was either on or off, and stored in a 15 litre conducting bag for ~20 minutes to observe size and charge distribution changes over time. Charge states were estimated using two Sequential Mobility Particle Sizers measuring the size and mobility distributions. Charge-neutral particles were measured 7 times and positive particles 9 times, the average charge-neutral value of x was 1.00 (sd = 0.06) while the average positive value was 4.60 (0.72). The system will be used to generate positive or charge neutral particles for delivery to human volunteers in an inhalation study to assess the impact of charge on ultrafine (size < 100 nm) particle deposition.

    Full details in the University publications repository