Observation of incipient particle formation during flame synthesis by tandem differential mobility analysis-mass spectrometry (DMA-MS)

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http://hdl.handle.net/10138/307936

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Wang , Y , Kangasluoma , J , Attoui , M , Fang , J , Junninen , H , Kulmala , M , Petäjä , T & Biswas , P 2017 , ' 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 . https://doi.org/10.1016/j.proci.2016.07.005

Title: Observation of incipient particle formation during flame synthesis by tandem differential mobility analysis-mass spectrometry (DMA-MS)
Author: Wang, Yang; Kangasluoma, Juha; Attoui, Michel; Fang, Jiaxi; Junninen, Heikki; Kulmala, Markku; Petäjä, Tuukka; Biswas, Pratim
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2017
Language: eng
Number of pages: 8
Belongs to series: Proceedings of the Combustion Institute
ISSN: 1540-7489
URI: http://hdl.handle.net/10138/307936
Abstract: While flame aerosol reactor (FLAR) synthesis of nanoparticles is widely used to produce a range of nano-materials, 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. (C) 2016 by The Combustion Institute. Published by Elsevier Inc.
Subject: Flame aerosol reactor (FLAR)
Combustion synthesis
Incipient particle
Differential mobility analysis (DMA)
Mass spectrometry (MS)
NANOSTRUCTURED TIO2 FILMS
AEROSOL
IONS
NANOPARTICLES
COMBUSTION
CLUSTERS
114 Physical sciences
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