TY - JOUR
T1 - Combined particle mass spectrometer - Quartz crystal microbalance apparatus for in situ nanoparticle monitoring during flame assisted synthesis
AU - Fomin, Alexey
AU - Poliak, Marina
AU - Rahinov, Igor
AU - Tsionsky, Vladimir
AU - Cheskis, Sergey
N1 - Funding Information:
This work was supported in part by the Israel Science Foundation (Grant No. 1069/08 ), the grant of Israel Ministry of Energy and Water Resources , and The Open University of Israel Research Authority (Grant No. 47324 ).
PY - 2013/10/1
Y1 - 2013/10/1
N2 - A newly developed apparatus for simultaneous in situ monitoring of size, mass and number concentration of a flame synthesised particle aerosol is presented. The diagnostics methodology is relying on combination of particle mass spectrometry and quartz crystal microbalance techniques. The analysis protocol includes molecular beam sampling, sorting the charged particles constituent according to mass/charge ratio (m/ze) via electrostatic deflection, and detection of the neutral particles by monitoring the variation of the quartz crystal oscillation frequency upon exposure to the particle - laden molecular beam. From these measurements, the total mass concentration and probability density distribution of m/ze could be directly determined, allowing to deduce the particle number concentration in the aerosol, at least in relative units. The feasibility of the method was demonstrated on the example of iron oxide nanoparticles (NPs) forming in CH4/O2/N2 dual stage flame doped with iron pentacarbonyl, Fe (CO)5 as a precursor of iron oxide NPs. Sensitivities of 6×104NP/s and 8×106NP/s were achieved for charged and neutral particles, respectively. Possible implications of the obtained results on the elucidation of iron oxide NP formation mechanism are discussed.
AB - A newly developed apparatus for simultaneous in situ monitoring of size, mass and number concentration of a flame synthesised particle aerosol is presented. The diagnostics methodology is relying on combination of particle mass spectrometry and quartz crystal microbalance techniques. The analysis protocol includes molecular beam sampling, sorting the charged particles constituent according to mass/charge ratio (m/ze) via electrostatic deflection, and detection of the neutral particles by monitoring the variation of the quartz crystal oscillation frequency upon exposure to the particle - laden molecular beam. From these measurements, the total mass concentration and probability density distribution of m/ze could be directly determined, allowing to deduce the particle number concentration in the aerosol, at least in relative units. The feasibility of the method was demonstrated on the example of iron oxide nanoparticles (NPs) forming in CH4/O2/N2 dual stage flame doped with iron pentacarbonyl, Fe (CO)5 as a precursor of iron oxide NPs. Sensitivities of 6×104NP/s and 8×106NP/s were achieved for charged and neutral particles, respectively. Possible implications of the obtained results on the elucidation of iron oxide NP formation mechanism are discussed.
KW - Flame
KW - Mass concentration
KW - Nanoparticles
KW - Particle mass distribution
KW - Particle mass spectrometer
KW - Quartz crystal microbalance
UR - http://www.scopus.com/inward/record.url?scp=84880630746&partnerID=8YFLogxK
U2 - 10.1016/j.combustflame.2013.04.011
DO - 10.1016/j.combustflame.2013.04.011
M3 - Article
AN - SCOPUS:84880630746
SN - 0010-2180
VL - 160
SP - 2131
EP - 2140
JO - Combustion and Flame
JF - Combustion and Flame
IS - 10
ER -