Journal ArticleDOI
Physicochemical Studies of Complex Silver–Magnetite Nanoheterodimers with Controlled Morphology
Oscar Moscoso-Londoño,Diego Muraca,Pablo Tancredi,Carlos Cosio-Castaneda,Kleber R. Pirota,Leandro M. Socolovsky +5 more
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In this paper, the influence of synthesis conditions on self-assembly capability and morphology of obtained Ag-Fe3O4 nanoheterostructures was discussed, and it was shown that the final shape depends on silver size and seed size.Abstract:
This work discusses the influence of synthesis conditions on self-assembly capability and morphology of obtained Ag–Fe3O4 nanoheterostructures. Samples were synthesized in two steps: first silver nanoparticles were synthesized and then used as seeds for the growth of iron oxide nanoparticles in a second step. The silver nanoparticle size was tuned, changing the oleylamine (OAm) and oleic acid (OA) ratio, which enables us to study the influence of chemical agents and seed size on the final magnetic nanoparticle morphology. The mechanism during the formation of these heterostructures has been discussed by several authors; however, it remains an open issue. In this paper we extend the discussion and advance on the understanding of synthesis conditions, related to silver sizes, chemical agents, and physical properties on the obtained nanoparticles. In our Ag–Fe3O4 system, two types of heterostructures were obtained: dimer, flower, or combination of the two. We have found that the final shape depends on silver...read more
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Compact Ag@Fe3O4 core-shell nanoparticles by means of single-step thermal decomposition reaction.
Maria Eugênia Fortes Brollo,R. López-Ruiz,Diego Muraca,Santiago J. A. Figueroa,Kleber R. Pirota,Marcelo Knobel +5 more
TL;DR: A temperature pause introduced in a simple single-step thermal decomposition of iron, with the presence of silver seeds formed in the same reaction mixture, gives rise to novel compact heterostructures: brick-like Ag@Fe3O4 core-shell nanoparticles that indicate a near superparamagnetic like behavior with a weak hysteresis at room temperature.
Journal ArticleDOI
Magnetic hyperthermia in brick-like Ag@Fe3O4 core–shell nanoparticles
Maria Eugênia Fortes Brollo,J. M. Orozco-Henao,R. López-Ruiz,Diego Muraca,Carlos S. B. Dias,Kleber R. Pirota,Marcelo Knobel +6 more
TL;DR: In this article, specific absorption rate (SAR) measurements were carried out by using the superparamagnetic theory, in which the basic morphology, size and dispersion of sizes played key roles.
Journal ArticleDOI
Effects of Nanostructure and Dipolar Interactions on Magnetohyperthermia in Iron Oxide Nanoparticles
J. M. Orozco-Henao,D. F. Coral,Diego Muraca,Oscar Moscoso-Londoño,P. Mendoza Zélis,M. B. Fernández van Raap,Surender K. Sharma,Kleber R. Pirota,Marcelo Knobel +8 more
TL;DR: In this article, the intrinsic magnetic properties of magnetic nanoparticle colloids are determined by the dipole-dipole interactions and the possible existence of clustering on the colloidal suspension.
Journal ArticleDOI
Oleic acid/oleylamine ligand pair: a versatile combination in the synthesis of colloidal nanoparticles.
Stefanos Mourdikoudis,Melita Menelaou,Nadesh Fiuza,Guangchao Zheng,Shuang Ying Wei,Jorge Pérez-Juste,Lakshminarayana Polavarapu,Zdeněk Sofer +7 more
TL;DR: In this article , the role of the oleic acid/oleylamine ligand pair in the chemical synthesis of nanoparticles is discussed, and the relation between tuning the resulting surface and volume nanoparticle properties and relevant applications is highlighted.
Journal ArticleDOI
Development of a cysteine sensor based on the peroxidase-like activity of AgNPs@ Fe3O4 core-shell nanostructures.
TL;DR: Based on the obstruction activity of cysteine on the peroxidase-like catalytic property of the nanocomposites, a sensor was developed for detection of cystein with a limit of detection as low as 87 nM and a wider range of linearity.
References
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Transmission Electron Microscopy
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Determination of the regularization parameter in indirect-transform methods using perceptual criteria
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Exchange-coupled magnetic nanoparticles for efficient heat induction
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TL;DR: This Letter demonstrates a significant increase in the efficiency of magnetic thermal induction by nanoparticles and finds that the therapeutic efficacy of these nanoparticles is superior to that of a common anticancer drug.
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Dumbbell-like Bifunctional Au−Fe3O4 Nanoparticles
TL;DR: The dumbbell is formed through epitaxial growth of iron oxide on the Au seeds, and the growth can be affected by the polarity of the solvent, as the use of diphenyl ether results in flower-like Au-Fe(3)O(4) nanoparticles.
Journal ArticleDOI
Noncollinear Spin Arrangement in Ultrafine Ferrimagnetic Crystallites
TL;DR: In this article, it was shown that the spin configuration differs from the N\'eel type found in large crystallites, and it was proposed that the ions in the surface layer are inclined at various angles to the direction of the net moment.