Recent progress in the synthesis of magnetic titania/iron-based, composite nanoparticles manufactured by laser pyrolysis

Fleaca, C.; Scarisoreanu, M.; Alexandrescu, R.; Dumitrache, F.; Luculescu, C.; Morjan, I.; Bı̂rjega, R.; Niculescu, A.; Filoti, G.; Kuncser, V.; Vasile, Eugeniu; Danciu, Virginia; Popa, Marcela

doi:10.1016/j.apsusc.2013.10.138

Cited by 12 publications

(2 citation statements)

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“…99%) volatile liquids were purchased from Merck, whereas ethylene (99.95%) sensitizer, synthetic air (80% nitrogen, 20% oxygen) and auxiliary argon (99.998%) were purchased from Linde Gas. Our laser pyrolysis experimental set-up was described in [31,32], when a similar three concentric nozzles injector was used for the synthesis of titania-based nanoparticles. Briefly, the TiCl 4 vapors carried from a bubbler by an air-ethylene mixture were introduced from the bottom of a vertical injector through the central nozzle, the ethylene-carried HMDSO vapors and various air flows through the second annular nozzle, whereas an Ar confinement flow pass through the third annular nozzle.…”

Section: Methodsmentioning

confidence: 99%

Laser oxidative pyrolysis synthesis and annealing of TiO2 nanoparticles embedded in carbon–silica shells/matrix

Fleaca

Scarisoreanu

Morjan

et al. 2015

Applied Surface Science

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Section: Methodsmentioning

confidence: 99%

Laser oxidative pyrolysis synthesis and annealing of TiO2 nanoparticles embedded in carbon–silica shells/matrix

Fleaca

Scarisoreanu

Morjan

et al. 2015

Applied Surface Science

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“…The laser pyrolysis was proven to be an adequate procedure to obtain nanocomposites with controlled size and composition of the components. − Recently, successful attempts to produce titania (TiO 2 ) nanoparticles by the above-mentioned method were reported, followed by the description of their magnetic and local interactions properties . Among the last specific applications of titania (excepting fillers in paints, pigments for inks, cosmetics, etc.)…”

Section: Introductionmentioning

confidence: 99%

Physical Mechanisms of Exchange Coupling Effects in Nanoparticulate Diluted Magnetic Oxides Obtained by Laser Pyrolysis

et al. 2017

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TiO2 nanoparticles, undoped and doped with Fe, have been prepared by laser pyrolysis and further investigated with respect to morphological, structural and magnetic aspects by transmission electron microscopy, diffractometry, Mössbauer spectroscopy, and magnetometry. The obtained nanoparticles, consisting of mainly anatase phase, agglomerate in clusters of tenths of units and present a large size distribution in the range from 5 to 40 nm. The anatase to rutile weight ratio (about 9) and the morphology of particles is similar in all analyzed samples (doped by up to 12 at. % Fe). Only Fe3+ ions in high spin configuration were observed mainly at the surface of TiO2 nanoparticles, either distributed or forming fine clusters of Fe oxide. Both a paramagnetic phase and a superparamagnetic one with blocking temperature lower than 50 K are superposed over a long-range ferromagnetic phase specific to diluted magnetic oxide systems. The influence of doping Fe ions on the magnetic behavior of each phase is discussed in detail. Evidences for interface exchange couplings (with unidirectional anisotropy in specific conditions) between the long-range ferromagnetic phase and the fine clusters (antiferromagnetic in nature), which become frozen below the blocking temperature of 50 K, are provided. The specificity of the processing route and the physical mechanisms responsible for the observed relevant magnetic features, which can be tailored for suitable applications, are discussed.

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Laser pyrolysis in papers and patents

2021

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This paper presents a critical review of laser pyrolysis. Although this technology is almost 60 years old, in literature many researchers, both from academia and industry, are still developing and improving it. On the contrary industrial applications are struggling to take off, if not in very restricted areas, although the technology has undoubted advantages that justify future development. The aim of this work consists in analysing a representative pool of scientific papers (230) and patents (121), from the last 20 years, to have an overview about the evolution of the method and try to understand the efforts spent to improve this technology effectively in academia and in industry. This study is important to provide a complete review about the argument, still missing in the literature. The objective is to provide an overview sufficiently broad and representative in the sources and to capture all the main ways in which laser pyrolysis has been used and with what distribution. The main focuses of the study are the analyses of the functions carried out by laser technologies, the application fields, and the types of used laser (i.e. models, power and fluence). Among the main results, the study showed that the main use of laser pyrolysis is to produce nanoparticles and coatings, the main materials worked by laser pyrolysis are silicon and carbon dioxide and the main searched properties in the products of laser pyrolysis are catalysts activity and electrical conductivity. CO2 lasers are the most used and the have high versatility compared to others. In conclusion, the study showed that laser pyrolysis is a consolidated technology within its main application fields (nanoparticles and coatings) for several years. Within this context, the technology has been developed on very different sizes and processes, obtaining a very wide range of results. Finally, these results may also have stimulated new areas of experimentation that emerged mainly in recent years and which concern biomedical applications, additive manufacturing, and waste disposal. Graphical abstract

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Recent progress in the synthesis of magnetic titania/iron-based, composite nanoparticles manufactured by laser pyrolysis

Cited by 12 publications

References 20 publications

Laser oxidative pyrolysis synthesis and annealing of TiO2 nanoparticles embedded in carbon–silica shells/matrix

Laser oxidative pyrolysis synthesis and annealing of TiO2 nanoparticles embedded in carbon–silica shells/matrix

Physical Mechanisms of Exchange Coupling Effects in Nanoparticulate Diluted Magnetic Oxides Obtained by Laser Pyrolysis

Laser pyrolysis in papers and patents

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