Journal ArticleDOI
Disruptive burning of precursor/solvent droplets in flame‐spray synthesis of nanoparticles
TLDR
In this paper, the combustion characteristics of isolated micron-sized precursor/solvent droplets are investigated experimentally, and the mechanism of disruptive droplet burning is similar to that of slurry droplets, consisting of three main steps: (1) diffusion-controlled burning of the highvolatile solvent, (2) viscous-shell formation due to decomposition of the low-volatile metal precursor, and (3) subsequent disruption due to heterogeneous nucleation.Abstract:
Flame spray pyrolysis is an established technique for synthesizing nanoparticles in the gas phase through aerosol combustion of precursor/solvent droplets. The combustion characteristics of isolated micron-sized precursor/solvent droplets are investigated experimentally. Pure solvent droplets burn uniformly and classically quasisteady, whereas precursor/solvent droplets manifest disruptive combustion behavior. The fast onset of droplet disruption, which occurs only for solutions with dissolved metal precursors, is not due to solid-particle precipitation within the droplet. Instead, the mechanism of disruptive droplet burning is similar to that of slurry droplets, consisting of three main steps: (1) diffusion-controlled burning of the high-volatile solvent, (2) viscous-shell formation due to decomposition of the low-volatile metal precursor, and (3) subsequent disruption due to heterogeneous nucleation. The time sequence of the three steps depends on the concentration and decomposition characteristics of the metal precursor, shortening with increased concentration and higher incremental decomposition temperature. © 2013 American Institute of Chemical Engineers AIChE J, 59: 4553–4566, 2013read more
Citations
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Flame aerosol synthesis of nanostructured materials and functional devices: Processing, modeling, and diagnostics
TL;DR: In this paper, the authors focus mainly on the recent trends in specific applications of flame aerosol synthesis in the last decade, e.g., usage of a substrate in stagnation geometry with controlled particle temperature-time history, application of external fields to control particle characteristics, development of advanced spray technique for doping synthesis of nanocomposites of multicomponent metal oxides or carbon-metal oxides, and fabrication of nanomaterial-based functional devices.
Journal ArticleDOI
Combustion synthesis of zero-, one-, two- and three-dimensional nanostructures: Current trends and future perspectives
Hayk H. Nersisyan,Jong-Hyeon Lee,Jinrui Ding,Kyo-Seon Kim,Khachatur V. Manukyan,Alexander S. Mukasyan,Alexander S. Mukasyan +6 more
TL;DR: In this article, a review of the state-of-the-art in the field of solid-phase combustion synthesis is presented, focusing on the relationship between combustion parameters and structure/properties of the produced nanomaterials.
Journal ArticleDOI
SpraySyn-A standardized burner configuration for nanoparticle synthesis in spray flames.
Florian Schneider,Samer Suleiman,Jan Menser,E. Borukhovich,Irenäus Wlokas,Andreas M. Kempf,Hartmut Wiggers,Christof Schulz +7 more
TL;DR: The design of the SpraySyn burner is introduced as a new standard for a free-jet type burner that offers well-defined and simulation-friendly boundary conditions and geometries as well as accessibility for optical diagnostics and reproducible operation across labs.
Journal ArticleDOI
Synthesis of Metal Oxide Nanoparticles in Flame Sprays: Review on Process Technology, Modeling, and Diagnostics
TL;DR: The gas synthesis of nanoparticles has gained major interest by different industries and research groups for the development of new materials and their subsequent implementation in numerous devices as discussed by the authors, which can be found in the literature.
Journal ArticleDOI
The Role of Microexplosions in Flame Spray Synthesis for Homogeneous Nanopowders from Low-cost Metal Precursors
TL;DR: In this article, the release mechanism of nitrate and carboxylate precursors from spray droplets has been investigated by single-droplet combustion experiments and thermogravimetric analysis, showing that neither precursor evaporation nor choice of solvents is prerequisite for homogeneous nanopowders but droplet microexplosions with continuing combustion.
References
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