Non-agglomerated dry silica nanoparticles

Flame-coating of titania particles with silica

“…content of the flame increases by 20% for the pure SiO 2 particle-laden (⌬H c,HMDSO ‫ס‬ −5540 kJ/mol) 29 and by 40% for the 80 wt% TiO 2 particle-laden flames (⌬H c,TTIP ‫ס‬ −8088 kJ/mol). 25 These temperature profiles and maximum values are consistent with Mueller et al 30 who produced 9 g/h SiO 2 at the same burner configuration and similar conditions.…”

Air Entrainment During Flame Aerosol Synthesis of Nanoparticles

“…The aerosol exit temperature of the 20-cm long tube decreases from about 1800 C to 500 C for increasing forced AE, as expected. It follows the same trend as open diffusion flame temperatures at increasing oxidizer flow rates (Mueller et al 2004). Since at temperatures above 1240 C, molten species of Cu 2 O or metallic Cu (depending on O 2 partial pressure) are expected to exit the tube (Schmidt-Whitley and MartinezClemente 1974), here the melting point of the newly formed particles (Cu x O y ) is assumed to be around 1240 C as indicated by the horizontal broken line in Figure 4b.…”

Independent Control of Metal Cluster and Ceramic Particle Characteristics During One-step Synthesis of Pt/TiO2

“…This dilutes the fuel accelerating mass transfer and results in earlier maximum flame temperatures and faster cooling rates. 8,17 After droplet evaporation and fuel (solvent) combustion, the flame temperature decreases similar to gas-fed flames. 10 The applied line-of-sight FTIR analysis averages the CO 2 temperatures throughout the spray flame.…”

“…Unagglomerated silica 8 and titania 9 particles with reduced primary particle sizes can be made by increasing the cooling rate through increasing the oxidant flow. External electrical fields to the flame induce ionic winds that increase flame cooling and reduce product primary particles.…”