Flame-made nanoparticles for nanocomposites

Camenzind, Adrian; Caseri, Walter; Pratsinis, Sotiris E.

doi:10.1016/j.nantod.2009.12.007

Cited by 94 publications

(78 citation statements)

References 104 publications

(201 reference statements)

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“…In the FSP process, particle-formation mechanism depends on several parameters. The most important of these parameters are flame temperature (decided by the heat of combustion of the solvent and premixed flame operating conditions), liquid precursor flow rate and concentration (effects the particle residence time and the degree of sintering), and dispersion oxygen's flow rate (effects the liquid droplets size in the spray) (Teoh et al 2010;Camenzinda et al 2010;Jossen et al 2005;Sel et al 2014). With high flame temperatures and enough residence time in the flame, the particle-formation mechanism follows gas-to-particle path only.…”

Section: Discussionmentioning

confidence: 99%

Synthesis and characterization of nanosized calcium phosphates by flame spray pyrolysis, and their effect on osteogenic differentiation of stem cells

et al. 2015

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The present study evaluates the synthesis of biocompatible osteoconductive and osteoinductive nano calcium phosphate (CaP) particles by industrially applied, aerosol-derived flame spray pyrolysis method for biomedical field. Calcium phosphate nanoparticles were produced in a range of calciumto-phosphorus ratio, (1.20-2.19) in order to analyze the morphology and crystallinity changes, and to test the bioactivity of particles. The characterization results confirmed that nanometer-sized, spherical calcium phosphate particles were produced. The average primary particle size was determined as 23 nm by counting more than 500 particles in TEM pictures. XRD patterns, HRTEM, SAED, and SEM analyses revealed the amorphous nature of the asprepared nano calcium phosphate particles at low Ca/P ratios. Increases in the specific surface area and crystallinity were observed with the increasing Ca/P ratio. TGA-DTA analysis showed that the thermally stable crystal phases formed after 700°C. Cell culture studies were conducted with urine-derived stem cells that possess the characteristics of mesenchymal stem cells. Synthesized amorphous nanoparticles did not have cytotoxic effect at 5-50 lg/ml concentration range. Cells treated with the as-prepared nanoparticles had higher alkaline phosphatase (ALP) enzyme activity than control cells, indicating osteogenic differentiation of cells. A slight decrease in ALP activity of cells treated with two highest Ca:P ratios at 50 lg/ml concentration was observed at day 7. The findings suggest that calcium phosphate nanoparticles Guest Editors: Mustafa Culha, Rawil F. Fakhrullin, Ratnesh Lal This article is part of the topical collection on Nanobiotechnology Electronic supplementary material The online version of this article

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Section: Discussionmentioning

confidence: 99%

Synthesis and characterization of nanosized calcium phosphates by flame spray pyrolysis, and their effect on osteogenic differentiation of stem cells

et al. 2015

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“…[ 15 , 29 ] The surface of as-prepared fl ame-made nanoparticles is typically hydrophilic [ 30 ] hindering their easy dispersion in typically hydrophobic polymers. [ 10 ] The present technique, however, enables synthesis of such nanocomposites that exhibit indeed superior fi ller-specifi c functionality (e.g., high magnetization) without compromising fi lm homogeneity and surface smoothness. [ 29 ] Figure 3 d shows a cross-sectional SEM image of a three-layer iron oxide/PMMA nanocomposite.…”

Section: Polymer Nanocomposite Synthesismentioning

confidence: 96%

“…[ 9 ] When dimensions of inorganic fi llers are reduced to nanoscale, composite properties improve signifi cantly and, typically, much less fi ller is needed to achieve superior performance. [ 10 ] For example, polymer/layered silicates nanocomposites are thermally more stable than pure polymer, [ 11 ] and the mechanical strength of silicone rubber improves progressively for smaller fi llers. [ 5 ] The use, however, of nanosized fi llers is accompanied by a challenge; such fi llers are difficult to disperse homogeneously without forming agglomerated fi llers [ 12 ] and leaving large, fi ller-free [ 9 ] domains in the polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

Flexible, Multifunctional, Magnetically Actuated Nanocomposite Films

Sotiriou¹,

Blattmann²,

Pratsinis³

2012

Adv Funct Materials

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Filler nanoparticles greatly enhance the performance of polymers and minimize filler content in the resulting nanocomposites. At the same time, they challenge the manufacturing of such nanocomposites by filler agglomeration and non‐uniform spatial distribution. Here, multifunctional nanocomposite films are made by capitalizing on flame‐synthesis of ceramic or metal filler nanoparticles followed by rapid, in situ deposition on sacrificial substrates, resulting in a filler film with controlled porosity. The polymer is then spin‐coated on the porous film that retained its stochastic but uniform structure, resulting in nanocomposites with homogeneous filler distribution and high filler‐loading. By sequential repetition of this procedure, sophisticated, multilayer, free‐standing, plasmonic‐ (Ag‐Fe2O3) and phosphorescent‐superparamagnetic (Y2O3:Eu3+‐ Fe2O3) actuators are made by precisely tuning the polymer thickness between each functional nanostructured layer. These actuators are quite flexible, have fast response times, and exhibit superior superparamagnetism due to their high filler content and homogeneous spatial distribution.

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“…Nucleation occurs from the vapor phase whereby the metal or metal oxide grows into a primary particle during residence, along the length of the hot reactive zone [17]. There may be several pathways through which the vaporized metal reacts, nucleates, and grows either during time of flight or directly onto the substrate [18].…”

Section: Introductionmentioning

confidence: 99%

Formation of Platinum (Pt) Nanocluster Coatings on K-OMS-2 Manganese Oxide Membranes by Reactive Spray Deposition Technique (RSDT) for Extended Stability during CO Oxidation

Garcés

Roller²,

King’ondu³

et al. 2014

ACES

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Nanocluster formation of a metallic platinum (Pt) coating, on manganese oxide inorganic membranes impregnated with multiwall carbon nanotubes (K-OMS-2/MWCNTs), applied by reactive spray deposition technology (RSDT) is discussed. RSDT applies thin films of Pt nanoclusters on the substrate; the thickness of the film can be easily controlled. The K-OMS-2/MWCNTs fibers were enclosed by the thin film of Pt. X-ray diffraction (XRD), scanning electron microscopy/X-ray energy dispersive spectroscopy (SEM/XEDS), focus ion beam/scanning electron microscopy (FIB/SEM), transmission electron microscopy (TEM), and X-ray 3D micro-tomography (MicroXCT) which have been used to characterize the resultant Pt/K-OMS-2/MWCNTs membrane. The non-destructive characterization technique (MicroXCT) resolves the Pt layer on the upper layer of the composite membrane and also shows that the membrane is composed of sheets superimposed into stacks. The nanostructured coating on the composite membrane material has been evaluated for carbon monoxide (CO) oxidation. The functionalized Pt/K-OMS-2/MWCNTs membranes show excellent conversion (100%) of CO to CO 2 at a lower temperature 200˚C compared to the uncoated K-OMS-2/MWCNTs. Moreover, the Pt/K-OMS-2/MWCNTs membranes show outstanding stability, of more than 4 days, for CO oxidation at 200˚C.

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Flame-made nanoparticles for nanocomposites

Cited by 94 publications

References 104 publications

Synthesis and characterization of nanosized calcium phosphates by flame spray pyrolysis, and their effect on osteogenic differentiation of stem cells

Synthesis and characterization of nanosized calcium phosphates by flame spray pyrolysis, and their effect on osteogenic differentiation of stem cells

Flexible, Multifunctional, Magnetically Actuated Nanocomposite Films

Formation of Platinum (Pt) Nanocluster Coatings on K-OMS-2 Manganese Oxide Membranes by Reactive Spray Deposition Technique (RSDT) for Extended Stability during CO Oxidation

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