Influence of flame stability on iron oxide nanoparticle growth during FSP

作者：Callum M. Kennedy, Yilong Zhang, Sibei Zou, Matthew J. Dunn, Assaad R. Masri · 发表于：Journal of Aerosol Science · 年份：2024 · DOI：10.1016/j.jaerosci.2024.106475 · 被引用次数：5 · 研究领域：Coagulation and Flocculation Studies、Laser-Ablation Synthesis of Nanoparticles、nanoparticles nucleation surface interactions

Flame stability during flame spray pyrolysis (FSP) remains an active topic of investigation due to its impact on synthesised particle attributes and purity. The unique feature of the burner investigated here is the ability to control flame stability over newly defined stability maps. The novelty of the current work lies in understanding the influence of these broad stability modes on nanoparticle growth during FSP and on the attributes of collected products. Several distinct flame configurations are selected for iron oxide nanoparticle synthesis, ranging from stable to highly unstable flames. The flame stability regimes are characterised by OH∗ chemiluminescence and broadband flame luminescence imaging. Stability is correlated with the coefficient of variation of flame luminescence (CV) and flame height with mean OH∗ chemiluminescence. Planar Mie scattering is then used to identify the effect of flame luminescence intermittency on spray atomisation and evaporation quality. For particle analysis, in-situ thermophoretic sampling is performed from 30 to 200 mm above the burner exit plane and analysed via transmission electron microscopy (TEM). Further ex-situ analysis is also performed on the bulk-collected product via high-resolution TEM, X-ray powder diffraction (XRD), and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR). It is demonstrated that flames with higher instability (CV min ≥ 0.35) maintain increased spray heights (>26 %) and reduced fl...