Figure 3
Time-dependence of the PG, VG, and H2O content in e-cigarette aerosol droplets. Time-dependence of the concentration of (a) PG, (b) VG, and (c) H2O for an example of a droplet generated from an e-liquid with 2% nicotine and pH 9.9. Light blue lines: Exponential fits to the experimental concentrations (Methods and Table 1).Time-evolution of the corresponding Raman spectra in the region of the (d) VG and PG band and (e) OH-stretch band. Measurements for pure VG and pure PG bulk solutions are shown as references.
