Observation of Incipient Particle Formation during Flame Synthesis by Tandem Differential Mobility Analysis-mass Spectrometry (DMA-MS)
While flame aerosol reactor (FLAR) synthesis of nanoparticles is widely used to produce a range of nanomaterials, incipient particle formation by nucleation and vapor condensation is not well understood. This gap in our knowledge of incipient particle formation is caused by limitations in instruments, where, during measurements, the high diffusivity of sub 3 nm particles significantly affects resolution and transport loss. This work used a high resolution differential mobility analyzer (DMA) and an atmospheric pressure interface-mass spectrometer (APi-TOF) to observe incipient particle formation during flame synthesis. By tandemly applying these two instruments, differential mobility analysis-mass spectrometry (DMA-MS) measured the size and mass of the incipient particles simultaneously, and the effective density of the sub 3 nm particles was estimated. The APi-TOF further provided the chemical compositions of the detected particles based on highly accurate masses and isotope distributions. This study investigated the incipient particle formation in flames with and without the addition of synthesis precursors. Results from FLAR using two types of precursors including tetraethyl orthosilicate (TEOS) and titanium isopropoxide (TTIP) are presented. The effect of the precursor feed rates on incipient particle growth was also investigated.
Y. Wang et al., "Observation of Incipient Particle Formation during Flame Synthesis by Tandem Differential Mobility Analysis-mass Spectrometry (DMA-MS)," Proceedings of the Combustion Institute, vol. 36, no. 1, pp. 745-752, Elsevier, Jan 2017.
The definitive version is available at https://doi.org/10.1016/j.proci.2016.07.005
Civil, Architectural and Environmental Engineering
Keywords and Phrases
Aerosols; Atmospheric pressure; Chemical analysis; Combustion; Combustion synthesis; Flame synthesis; Mass spectrometry (MS); Spectrometry; Synthesis (chemical); Chemical compositions; Differential mobility analysis (DMA); Differential mobility analyzers; Flame aerosol reactor (FLAR); Isotope distributions; Tandem differential mobility analysis; Tetraethyl orthosilicates; Titanium Isopropoxide; Particle size analysis; Incipient particle
International Standard Serial Number (ISSN)
Article - Journal
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01 Jan 2017