A new approach to understand liquid injection into atmospheric plasma jets

Abstract

Infrared images are used to characterize the atmospheric plasma and the influence of liquid injection into it. In the infrared spectral range low energies of rotational vibrational transitions can be captured which are emitted by hot liquid vapors. These vapor streams enable the qualification of the injection depth. High speed shadowgraphy is used to prove the correlations between vapor cloud and drop atomization behavior. In addition the combustion of organic liquids like ethanol and pentanol can be seen directly with an increase of emitted radiation. A direct correlation between vapor cone and liquid properties can be made. Lower Ohnesorge numbers lead to more focused vapor beams.

Investigation of 3‐aminopropyltrimethoxysilane for direct deposition of thin films containing primary amine groups by open‐air plasma jets

“…This behavior can be observed when liquids are directly nebulized by the postdischarge of APPJs and was found to be highly dependent on the nature of the precursor and still necessitates investigation to be understood. [14,54] However, increasing the gas temperature promoted vaporization, explaining the decrease of the APTMS droplet size with the processing power and the production of smooth and homogeneous coatings. It is observed that nitrogen shows lower temperatures than air at the same powers.…”