Figure 13
Schematic of the modified PGSS apparatus adapted from Vezzù et al. [71]. MO, electric motor; AM, stirrer; MC, mixing chamber; U, nozzle; CE, expansion chamber; F, filter; R 1 to R 4, electric resistances; SC, heater exchanger; P1, pump; P2, manual syringe pump; V1 to V6, on-off valves; PR, pressure reducer; C, air compressor; D, synthetic air or nitrogen cylinder; TIC, temperature indicator and controller.