Formation of superparamagnetic nanocomposites from vapor phase condensation in a flame

Zachariah, Michael R.; Aquino, M.; Shull, Robert D.; Steel, Eric B.

doi:10.1016/0965-9773(95)00260-l

Cited by 92 publications

(64 citation statements)

References 6 publications

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“…This process offers advantages such as low cost, single step processing, versatility and high production rates [139][140][141][142]. In the combustion flame spraying process, burning a fuel/oxygen mixture in spray torch [140] or flat-flame burner [141] generates a flame.…”

Section: Spray Conversion Processingmentioning

confidence: 99%

Nanocrystalline materials and coatings

Tjong

Chen

2004

Materials Science and Engineering: R: Reports

833

345

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In recent years, near-nano (submicron) and nanostructured materials have attracted increasingly more attention from the materials community. Nanocrystalline materials are characterized by a microstructural length or grain size of up to about 100 nm. Materials having grain size of $0.1 to 0.3 mm are classified as submicron materials. Nanocrystalline materials exhibit various shapes or forms, and possess unique chemical, physical or mechanical properties. When the grain size is below a critical value ($10-20 nm), more than 50 vol.% of atoms is associated with grain boundaries or interfacial boundaries. In this respect, dislocation pile-ups cannot form, and the Hall-Petch relationship for conventional coarse-grained materials is no longer valid. Therefore, grain boundaries play a major role in the deformation of nanocrystalline materials. Nanocrystalline materials exhibit creep and super plasticity at lower temperatures than conventional micro-grained counterparts. Similarly, plastic deformation of nanocrystalline coatings is considered to be associated with grain boundary sliding assisted by grain boundary diffusion or rotation. In this review paper, current developments in fabrication, microstructure, physical and mechanical properties of nanocrystalline materials and coatings will be addressed. Particular attention is paid to the properties of transition metal nitride nanocrystalline films formed by ion beam assisted deposition process. #

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Section: Spray Conversion Processingmentioning

confidence: 99%

Nanocrystalline materials and coatings

Tjong

Chen

2004

Materials Science and Engineering: R: Reports

833

345

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“…There are several technologies which can be employed in the manufacture of nanoscale materials (films, particles, etc.) (Ulrich 1971); Zachariah et al 1995;Kuo and Rivera (2007); Tricoli and Pratsinis (2009). Vapor-phase methodologies are favored because of chemical purity and cost considerations (Pratsinis 1998).…”

Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation of Titanium Dioxide Nanoparticle Formation and Growth in Turbulent Jets

Loeffler

Das

Garrick

2011

Aerosol Science and Technology

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Large eddy simulations (LES) of titanium dioxide nanoparticles in three dimensional turbulent reacting planar jets are performed. The spatio-temporal evolution of the particle field is obtained by utilizing a nodal representation of the general dynamic equation. Gradient-diffusion, Smagorinsky-type subgrid-scale closures are employed to account for the unresolved stresses, fluid-scalar fluxes, and fluid-particle fluxes. The effect of the unresolved fluctuations on coagulation are neglected. Simulations are performed at two different precursor concentration levels. Comparison between results obtained via direct numerical simulation (DNS) and LES is performed to assess the performance of the closures. The LES performs fairly well in predicting the particle concentration as a function of size as well as the mean diameter. Additionally the polydispersity of the LES particle field is greater than that of the DNS. The results also suggest that at as the precursor concentration increases, neglect of the unresolved particle-particle interactions may act to increase the nanoparticle growth-rate.

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“…One of the main goals in this research is to study the evolution of the internal state of the aerosol droplets and accurately predict and control their internal morphology. Initial success in growing interesting microstructures [26] indicated that further research was warranted. In subsequent studies both in-situ investigation into the formation process [18], multi-component aerosol dynamic modeling [3] and molecular dynamics computation [27] have been employed.…”

Section: Modeling and Simulation Of Multi-component Aerosol Dynamicsmentioning

confidence: 99%

“…There are experimental studies on the formation of binary metal oxide systems with application to removal of heavy metals [4,5] as well as the formation of materials with novel and interesting properties [10,11,26]. One of the main goals in this research is to study the evolution of the internal state of the aerosol droplets and accurately predict and control their internal morphology.…”

Section: Modeling and Simulation Of Multi-component Aerosol Dynamicsmentioning

confidence: 99%

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Modeling and simulation of multi-component aerosol dynamics

Efendiev¹

2004

Mat. apl. comput.

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Abstract. In this paper we consider the modeling of heterogeneous aerosol coagulation where the heterogeneous aerosol particles (called droplets) contain smaller particles (enclosures).Droplets and enclosures coagulate with different collision kernels. We discuss macroscopic modeling and simulation of these processes using both deterministic and Monte-Carlo methods.Mathematical subject classification: 65C05, 65C35.

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Formation of superparamagnetic nanocomposites from vapor phase condensation in a flame

Cited by 92 publications

References 6 publications

Nanocrystalline materials and coatings

Nanocrystalline materials and coatings

Large Eddy Simulation of Titanium Dioxide Nanoparticle Formation and Growth in Turbulent Jets

Modeling and simulation of multi-component aerosol dynamics

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