Open AccessNanocrystalline functional materials and nanocomposites synthesis through aerosol routes
Author(s) -
Olivera Milošević,
Lidija Mančić,
Zorica V. Marinković,
Saloshi Ohara,
Takehisa Fukui,
A. Várez,
J. M. Torralba
Publication year - 2003
Publication title -
hemijska industrija
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.147
H-Index - 19
eISSN - 2217-7426
pISSN - 0367-598X
DOI - 10.2298/hemind0306262m
Subject(s) - nanocrystalline material , materials science , agglomerate , aerosol , chemical engineering , sintering , economies of agglomeration , thermal decomposition , nanoparticle , nanocomposite , particle (ecology) , crystallite , evaporation , particle size , decomposition , nanotechnology , composite material , metallurgy , chemistry , organic chemistry , oceanography , physics , geology , engineering , thermodynamics
This paper represents the results of the design of functional nanocrystalline powders and nanocomposites using chemical reactions in aerosols. The process involves ultrasonic aerosol formation (mist generators with the resonant frequencies of 800 kHz, 1.7 and 2.5 MHz) from precursor salt solutions and control over the aerosol decomposition in a high-temperature tubular flow reactor. During decomposition, the aerosol droplets undergo evaporation/drying, precipitation and thermolysis in a single-step process. Consequently, spherical, solid, agglomerate-free submicronic particles are obtained. The particle morphology, revealed as a composite structure consisting of primary crystallites smaller than 20 nm was analysed by several methods (XRD, DSC/DTA, SEM, TEM) and discussed in terms of precursor chemistry and process parameters. Following the initial attempts, a more detailed aspect of nanocrystalline particle synthesis was demonstrated for the case of nanocomposites based on ZnO-MeO (MeO=Bi Cr+), suitable for electronic applications, as well as an yttrium-aluminum base complex system, suitable for phosphorus applications. The results imply that parts of the material structure responsible for different functional behaviour appear through in situ aerosol synthesis by processes of intraparticle agglomeration, reaction and sintering in the last synthesis stage