Journal ArticleDOI
Ceramic Powder Synthesis by Spray Pyrolysis
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TLDR
A review of spray pyrolysis processes in terms of the process parameters that enable the formation of particles with controlled morphology and composition can be found in this paper, where it is demonstrated that mixed metal oxide, nonoxide, and composite particles that are solid, hollow, porous, or fibrous can be produced by modifying the precursor characteristics, solution properties, and process parameters.Abstract:
A variety of spray pyrolysis (SP) techniques have been developed to directly produce ceramic powders from solutions. This paper reviews the current status of these processes in terms of the process parameters that enable the formation of particles with controlled morphology and composition. A model incorporating solute diffusion in the droplet and solvent evaporation from the droplet surface is presented to establish the critical parameters leading to solid particle formation. The model illustrates that solid particles can be obtained if solutes with high solubility and a large difference between the critical supersaturation and equilibrium concentration are used and if the process is designed to avoid solvent boiling. It is demonstrated that mixed metal oxide, non-oxide, and composite particles that are solid, hollow, porous, or fibrous can be produced by modifying the precursor characteristics, solution properties, and process parameters. The physical and chemical flexibility of SP processes offers numerous opportunities for the controlled synthesis of advanced ceramic powders and films. However, production rates are limited by the need to produce <5-[mu]m-diameter droplets and to avoid subsequent droplet coagulation. Developments in process controls, atomization, and system design are required for wider commercialization of SP-type processes.read more
Citations
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The preparation of magnetic nanoparticles for applications in biomedicine
Pedro Tartaj,María del Puerto Morales,Sabino Veintemillas-Verdaguer,T. González-Carreño,Carlos J. Serna +4 more
TL;DR: In this article, a review of state-of-the-art synthetic routes for the preparation of magnetic nanoparticles useful for biomedical applications is presented, with a special emphasis on showing the benefits of using nanoparticles.
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The preparation of magnetic nanoparticles for applications in biomedicine : Biomedical applications of magnetic nanoparticles
Pedro Tartaj,María del Puerto Morales,Sabino Veintemillas-Verdaguer,T. González-Carreño,Carlos J. Serna +4 more
TL;DR: In this paper, a review of state-of-the-art synthetic routes for the preparation of magnetic nanoparticles useful for biomedical applications is presented, with a special emphasis on showing the benefits of using nanoparticles.
Journal ArticleDOI
Applications of Ultrasound to the Synthesis of Nanostructured Materials
Jin Ho Bang,Kenneth S. Suslick +1 more
TL;DR: The fundamental principles of both synthetic methods and recent development in the applications of ultrasound in nanostructured materials synthesis are summarized.
Journal ArticleDOI
Gas sensors using hierarchical and hollow oxide nanostructures: Overview
TL;DR: In this article, the authors show that hierarchical and hollow oxide nanostructures increase both the gas response and response speed simultaneously and substantially, which can be explained by the rapid and effective gas diffusion toward the entire sensing surfaces via the porous structures.
Ministry of Education and Science of the Russian Federation
TL;DR: The abstract should follow the structure of the article (relevance, degree of exploration of the problem, the goal, the main results, conclusion) and characterize the theoretical and practical significance of the study results.
References
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Journal ArticleDOI
New design concept of structural ceramics―ceramic nanocomposites
TL;DR: In this paper, intergranular nanocomposites were found to have two to five times higher toughness and strength at room temperature than those of monolithic materials, and the hardness, toughness, strength and fracture resistance for creep and fatigue at high temperatures as well as the thermal shock fracture resistance were also strongly improved for these composites.
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Research opportunities on clusters and cluster-assembled materials—A Department of Energy, Council on Materials Science Panel Report
R. P. Andres,Robert S Averback,W. L. Brown,Louis E. Brus,William A. Goddard,A. Kaldor,S. G. Louie,M. Moscovits,Paul S. Peercy,S. J. Riley,Richard W. Siegel,Frans Spaepen,Y. Wang +12 more
TL;DR: In this article, the size-dependent physical and chemical properties of clusters, the methods of synthesis of macroscopic amounts of size-selected clusters with desired properties, and most importantly, the possibility of their controlled assembly into new materials with novel properties.
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Formation, Packing, and Sintering of Monodisperse TiO2 Powders
Eric A. Barringer,H. Kent Bowen +1 more
TL;DR: In this article, a monodisperse TiO2 powders were synthesized by controlled hydrolysis of dilute alcoholic solutions of titanium alkoxides, and the state of powder aggregation in dispersions and powder packing in the green bodies strongly affected the sintering behavior.
Journal ArticleDOI
Optical and electrical properties of ZnO films prepared by spray pyrolysis for solar cell applications
TL;DR: In this paper, spray pyrolysis was used to produce transparent zinc oxide films with resistivity as low as 10−3 Ω(cm) by controlling the deposition procedure and postdeposition annealing in hydrogen.
Journal ArticleDOI
Studies of concentrated electrolyte solutions using the electrodynamic balance. 1. Water activities for single-electrolyte solutions
TL;DR: In this paper, an electrodynamic balance has been used to measure the water activity as a function of solute concentration at 20 °C for three aqueous electrolyte mixtures: NaCI-KCI, NaCl-KBr, and NaCl-(NH_4)_2SO_4.