TY - JOUR
T1 - An aerosol chemical reactor for coating metal oxide particles with (NH4)2SO4-H2SO4-H2O - Part 2
T2 - Manipulation of the metal oxide core
AU - Martin, Scot T.
AU - Yu, Jiangping
AU - Han, Jeong Ho
AU - Verdier, Melanie
AU - Li, Jia
AU - Buseck, P R
N1 - Funding Information:
David Leith and Randall Goodman provided very helpful input and discussion on the design of the electrostatic precipitator. STM is grateful for support received from the NSF Atmospheric Chemistry Program, the Petroleum Research Fund, a Presidential Early Career Award in Science and Engineering (PECASE), and the Defense University Research Instrumentation Program (DURIP), Department of Army. PRB acknowledges a grant from the NSF Atmospheric Chemistry Program.
PY - 2000/11
Y1 - 2000/11
N2 - The complex chemical and morphological character of atmospheric particles challenges laboratory scientists to produce and study similar particles. In this paper, spray pyrolysis methods are adapted for the production of aerosols of hematite (α-Fe2O3), corundum (α-Al2O3), mullite (Al6Si2O13), and amorphous silica (am-SiO2). The particle mode diameter and the total number concentration vary from 30 to 300 nm and 105 to 107cm-3, respectively, when the precursor concentrations are adjusted from 100μM to 1M. The precursors include FeCl3.6H2O, Al(NO3)3.9H2O, and Si(OCH2CH3)4, which are nebulized and flowed through a tube furnace at 1200°C. Single-crystal hematite and mullite and polycrystalline corundum result. Decomposition products from Al(NO3)3.9H2O include NO(g) and NO2(g). Methanol, which is the precursor solvent for mullite and silica, thermally decomposes to yield several gases, including H2O, CO, CO2, CH4, C2H2, and C2H4. In a separate tube furnace incorporated in the aerosol flow stream, the oxide particles are coated with sulfuric acid, which is subsequently neutralized by NH3(g). Copyright (C) 2000 Elsevier Science B.V.
AB - The complex chemical and morphological character of atmospheric particles challenges laboratory scientists to produce and study similar particles. In this paper, spray pyrolysis methods are adapted for the production of aerosols of hematite (α-Fe2O3), corundum (α-Al2O3), mullite (Al6Si2O13), and amorphous silica (am-SiO2). The particle mode diameter and the total number concentration vary from 30 to 300 nm and 105 to 107cm-3, respectively, when the precursor concentrations are adjusted from 100μM to 1M. The precursors include FeCl3.6H2O, Al(NO3)3.9H2O, and Si(OCH2CH3)4, which are nebulized and flowed through a tube furnace at 1200°C. Single-crystal hematite and mullite and polycrystalline corundum result. Decomposition products from Al(NO3)3.9H2O include NO(g) and NO2(g). Methanol, which is the precursor solvent for mullite and silica, thermally decomposes to yield several gases, including H2O, CO, CO2, CH4, C2H2, and C2H4. In a separate tube furnace incorporated in the aerosol flow stream, the oxide particles are coated with sulfuric acid, which is subsequently neutralized by NH3(g). Copyright (C) 2000 Elsevier Science B.V.
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U2 - 10.1016/S0021-8502(00)00035-5
DO - 10.1016/S0021-8502(00)00035-5
M3 - Article
AN - SCOPUS:0034333743
SN - 0021-8502
VL - 31
SP - 1283
EP - 1298
JO - Journal of Aerosol Science
JF - Journal of Aerosol Science
IS - 11
ER -