AAAR 37th Annual Conference October 14 - October 18, 2019 Oregon Convention Center Portland, Oregon, USA
Abstract View
Backscattering from Fractal Aggregates
BLAINE FRY, Christopher Sorensen, Raiya Ebini, Kansas State University
Abstract Number: 335 Working Group: Aerosol Physics
Abstract We present studies of light backscattering from a system of aggregating fractal aggregates. Scattered light was collected between 175.5 and 184.5 degrees by a 512-channel photodiode array, as a function of time after the onset of aggregation. Results are contextualized by comparing with forward scattering and dynamic scattering to retrieve the fractal dimension and mobility radius of the aggregates, respectively. The system studied herein is a colloidal suspension of destabilized polystyrene-latex nanospheres, but the ubiquitous nature of fractal aggregates extends our implications to the aerosol phase as well. The data show that backscattering from fractal aggregates is not a function of angle but is a function of time which parameterizes the extent of aggregation. The backscattered intensity initially increases with time, but eventually levels off while the system continues to aggregate.