Particle Formation and Growth in Gases from Totally Filtered Mainstream Cigarette Smoke

摘要

Aerosol particle formation and growth has been observed in aging, initially particle-free gases obtained from filtered mainstream cigarette smoke. The time scale of particle formation and growth was on the order of minutes and was highly dependent on cigarette tobacco type. Measurements by both ensemble and single particle light-scattering methods were consistent with scattering from an aerosol with a fixed number of particles that grow into the tenth micron range. The rate of particles that grow into the tenth micron range. The rate of particle size increase agreed best with that predicted for growth controlled by condensable species formation by gas-phase reaction slower than the diffusion rate of the reaction products. A simple reaction scheme involving nitrogen oxide oxidation and reaction with isoprene reproduced the observed form of the particle growth curves but did not yield a consistent reaction rate constant for the various cigarette tobacco types, suggesting that additional reactants are involved in the particle formation.