Growth of zirconia particles made by flame spray pyrolysis

Mueller, Roger; Jossen, Rainer; Kammler, Hendrik K.; Pratsinis, Sotiris E.; Akhtar, M. Kamal

doi:10.1002/aic.10272

Cited by 80 publications

(91 citation statements)

References 47 publications

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“…Therefore the particle characteristics at various growth stages could be learned. Thermophoretic sampling has been used repeatedly in understanding particle evolution in flames (Dobbins and Megaridis 1987;Kennedy 2004, 2007;Guo et al 2009b;Mueller et al 2004).…”

Section: Thermophoretic Samplingmentioning

confidence: 99%

Formation of Magnetic Fe_xO_y/Silica Core-Shell Particles in a One-Step Flame Aerosol Process

Guo¹,

Yim²,

Khasanov³

et al. 2010

Aerosol Science and Technology

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In this study, iron silicon oxide particles were generated in a onestep flame assisted spray pyrolysis (FASP) process using H 2 /air or H 2 /O 2 diffusion flames. A colloidal precursor solution was used, which contained dissolved iron nitrate and stably suspended silica nanoparticles. H 2 /air flames resulted in magnetic Fe x O y /silica core-shell particles. There was a correlation between particle size and particle structure; particles larger than 500 nm had the coreshell structure, but smaller particles had non-core-shell structures. H 2 /O 2 flames only resulted in nanoparticles that had non-coreshell structures. The core-shell particles had a iron oxide core that was hermetically enclosed in a uniform silica shell with a typical thickness of approximately 100 nm; they were superparamagnetic with a room-temperature saturation magnetization greater than 24 emu/g. Temperature history of the particles may be used to explain the correlation between flame type and particle structure. The correlation between particle size and structure may be due to size-dependent thermodynamic stability of the structures, or kinetics of heat and mass transfer. The results from this study suggest that micrometer sized iron oxide silica core-shell magnetic particles could be generated from a one-step flame aerosol process, but Fe x O y /silica nanoparticles (<100 nm) with the coreshell structure cannot be generated in a one-step flame aerosol process.

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Section: Thermophoretic Samplingmentioning

confidence: 99%

Formation of Magnetic Fe_xO_y/Silica Core-Shell Particles in a One-Step Flame Aerosol Process

Guo¹,

Yim²,

Khasanov³

et al. 2010

Aerosol Science and Technology

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“…ZrO2 synthesis reported in [25]). By contrast, if solvent evaporation is slow, egg-shell hollow particles can form, possibly breaking down due to the explosive evaporation of the residual solvent inside them [25,28,32].…”

Section: -Principles Of the Fp Techniquementioning

confidence: 99%

“…By contrast, if solvent evaporation is slow, egg-shell hollow particles can form, possibly breaking down due to the explosive evaporation of the residual solvent inside them [25,28,32]. This phenomenon can be observed with fusible precursors even in the case of rapid solvent evaporation, as e.g.…”

Section: -Principles Of the Fp Techniquementioning

confidence: 99%

“…Formerly, the main limitation was due to the availability of volatile precursors to be fed to the flame. More recently, aerosol or liquid-feed flame pyrolysis (FP) allowed to overcome the low productivity problem, hence widely extending the application field of flame synthesis [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. Among the methods proposed, the spray FP seems the most interesting for the production of perovskitic oxides, since it does not require volatile precursors.…”

Section: -Introductionmentioning

confidence: 99%

“…Among the methods proposed, the spray FP seems the most interesting for the production of perovskitic oxides, since it does not require volatile precursors. It is based on a specially designed burner [20][21][22][23][24][25][26][27][28][29][30][31]39], fed with oxygen through a nozzle, where an organic solution of the precursors is also fed, the solvent acting as the fuel for the flame. The mixture is ignited by a surrounding ring of O2/CH4 flamelets.…”

Section: -Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Flame-spray pyrolysis preparation of perovskites for methane catalytic combustion

Chiarello

Rossetti

Forni

2005

Journal of Catalysis

135

128

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A flame spray pyrolysis apparatus was set-up and optimised for the preparation of perovskitic mixed metal oxides in nanoparticle-size powder form. LaCoO3 was chosen as test catalyst, aiming at correlating crystallinity, surface area, particle size, catalytic activity and durability with some fundamental operating parameters of the apparatus. In particular, feeding rate of precursors solution, flow rate of the O2/CH4 mixture for the igniter and flow rate and linear velocity of the main dispersing-oxidising oxygen have been thoroughly analysed. The activity of the prepared samples was tested for the catalytic flameless combustion of methane, a reaction requiring a proper combination of activity and thermal stability of the catalyst. Provided a crystalline perovskitic phase forms, activity increases with increasing surface area of the powder. By contrast, the higher the initial sintering of catalyst particles within the flame, the higher is thermal stability. Tuning up of operating parameters allows to properly address the desired catalyst properties.

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Zirconia Nanomaterials: Synthesis and Biomedical Application

Garnweitner

2009

Nanotechnologies for the Life Sciences

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8.1 IntroductionToday, zirconia nanomaterials are attracting great interest for applications in the fi elds of catalysis and sensing [1 -8] , as fi ller materials in organic -inorganic nanocomposites with enhanced mechanical or optical properties [9 -13] , and as solid electrolytes [14] . Their development and application in the biomedical fi eld, however, has not yet received much attention, this being in stark contrast to other metal oxides such as magnetite or silica. The reasons for this surely include the greater diffi culty of synthesis and manipulation of zirconia nanostructures with defi ned and highly controlled properties, and the fact that, as a hard nonmagnetic ceramic material, zirconia is not a priori suited for tasks such as drug delivery or diagnostic imaging that currently represent the backbone of the -arbitrarily defi ned -new area of ' nanomedicine ' [15, 16] . Although zirconia -based materials are usually not considered for such applications [17, 18] , this does not imply that they are not highly suited for use in the biomedical fi eld. On the contrary, they possess great potential due to their outstanding material properties in terms of mechanical behavior, especially their high tensile strength and toughness, good corrosion and abrasion resistance [19] and superplasticity [20] , as well as their nontoxicity [21] and oncological safety [22, 23] .The relatively low profi le that zirconia nanomaterials have found stems from the fact that very diverse research areas, from ceramic engineering to biochemistry, are currently involved in the development of nanostructured or nanoengineered zirconia biomaterials. However, as yet no strong impetus of any one combined research goal has emerged that would create a multidisciplinary, but unifi ed and more interactive, research community -as has been the case for example in the fi eld of magnetic nanomaterials for diagnostic imaging. Until now, no single specialized review article dedicated to zirconia -based nanostructured materials has been prepared. Hence, the aim of this chapter is to fi ll that gap and to report on the development of zirconia -based nanomaterials from a totally new perspective of applications in the life sciences, attempting to combine the so -far

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Growth of zirconia particles made by flame spray pyrolysis

Cited by 80 publications

References 47 publications

Formation of Magnetic Fe_xO_y/Silica Core-Shell Particles in a One-Step Flame Aerosol Process

Formation of Magnetic Fe_xO_y/Silica Core-Shell Particles in a One-Step Flame Aerosol Process

Flame-spray pyrolysis preparation of perovskites for methane catalytic combustion

Zirconia Nanomaterials: Synthesis and Biomedical Application

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Growth of zirconia particles made by flame spray pyrolysis

Cited by 80 publications

References 47 publications

Formation of Magnetic FexOy/Silica Core-Shell Particles in a One-Step Flame Aerosol Process

Formation of Magnetic FexOy/Silica Core-Shell Particles in a One-Step Flame Aerosol Process

Flame-spray pyrolysis preparation of perovskites for methane catalytic combustion

Zirconia Nanomaterials: Synthesis and Biomedical Application

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Formation of Magnetic Fe_xO_y/Silica Core-Shell Particles in a One-Step Flame Aerosol Process

Formation of Magnetic Fe_xO_y/Silica Core-Shell Particles in a One-Step Flame Aerosol Process