Figures & data
Figure 1. Schematic of the DBD reactor (a) and the spark generator (b).
Figure 2. Typical instantaneous current and voltage of (a) the DBD reactor and (b) the spark generator during discharges under high frequency sinusoidal voltage, and the matched power-voltage curves of (c) the DBD reactor and (d) the spark generator. White noise around baseline is filtered out in power calculation. The average power over a period is 1.34 W and 28.46 W for the DBD and spark reactors, respectively. (The figure shows the working voltages between the electrodes, while the applied voltages from the power source is Vpeak-peak = 6 kV, the applied frequency is f = 10 kHz.)
Figure 3. The gas temperatures in the discharge region of the DBD reactor and the spark generator as a function of (a) the applied voltage amplitude (fDBD = 1 kHz, fspark = 10 kHz) and (b) the driving frequency (VDBD = 6 kV, Vspark = 10 kV).
Figure 4. Total number concentrations and geometric mean diameters of nanoparticles generated by the DBD reactor and the spark generator, as a function of (a) the applied voltage amplitude (fDBD = 1 kHz, fspark = 10 kHz) and (b) the driving frequency (VDBD = 6 kV, Vspark = 10 kV).
Figure 5. Average size distributions of nanoparticles generated by the DBD reactor and the spark generator at different applied voltage amplitudes and driving frequencies (2 L/min argon working gas flow; geometric mean diameter Dg; geometric standard deviation σg).
Figure 6. (a)–(d) stability maps (contour plots) of the nanoparticle size distributions and temporal variations of the geometric mean diameter; (e)–(f) temporal variations of the total number concentration (2 L/min argon working gas flow; geometric mean diameter Dg).
