Abstract
Soot aggregate restructuring is explored in laboratory prepared soot particles upon exposure to high humidity environment followed by rapid water evaporation. Soot was generated in a Santoro style ethylene diffusion burner, and condensation of water on the soot particles was realized in a temperature-controlled water growth tube. The structure transformation of soot particles under different humidity conditions was monitored using a Differential Mobility Analyzer – Aerosol Particle Mass Analyzer (DMA-APM) and Tandem Differential Mobility Analyzer (TDMA) methods. The primary measured properties were mass-mobility scaling exponent, particle mass and mobility size before and after processing. A critical saturation ratio was observed above which aggregate restructuring occurred. The morphological change was visualized by taking electron microscopic images. X-ray photoelectron spectroscopy (XPS) analysis found that the chemical structures of different processed soot were indistinguishable. To assess if soot collapse occurred during water condensation or evaporation, water-coated soot was directly injected into water, where multi-angle light scattering showed that the structure was uncollapsed. This result indicates that soot restructuring driven by capillary forces occurs during evaporation, not condensation.
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