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Superparamagnetism

About: Superparamagnetism is a research topic. Over the lifetime, 10264 publications have been published within this topic receiving 296477 citations.


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Journal ArticleDOI
TL;DR: The amino-functionalized magnetic nano-adsorbent shows a quite good capability for the rapid and efficient adsorption of metal cations and anions from aqueous solutions via the chelation or ion exchange mechanisms.

546 citations

Journal ArticleDOI
TL;DR: The progress in the field of understanding and harnessing the interactions of polymeric nanoparticles synthesized by the miniemulsion process with different cell types is discussed and the blood-brain barrier is focused on.

545 citations

Journal ArticleDOI
TL;DR: In this article, the superparamagnetism of Fe3O4@Ag nanoparticles with both superparamagnetic and antibacterial properties were obtained by reducing silver nitrate on the surface of the nanoparticles using the water-in-oil microemulsion method.
Abstract: Bifunctional Fe3O4@Ag nanoparticles with both superparamagnetic and antibacterial properties were prepared by reducing silver nitrate on the surface of Fe3O4 nanoparticles using the water-in-oil microemulsion method. Formation of well-dispersed nanoparticles with sizes of 60 ± 20 nm was confirmed by transmission electron microscopy and dynamic light scattering. X-ray diffraction patterns and UV–visible spectroscopy indicated that both Fe3O4 and silver are present in the same particle. The superparamagnetism of Fe3O4@Ag nanoparticles was confirmed with a vibrating sample magnetometer. Their antibacterial activity was evaluated by means of minimum inhibitory concentration value, flow cytometry, and antibacterial rate assays. The results showed that Fe3O4@Ag nanoparticles presented good antibacterial performance against Escherichia coli (gram-negative bacteria), Staphylococcus epidermidis (gram-positive bacteria) and Bacillus subtilis (spore bacteria). Furthermore, Fe3O4@Ag nanoparticles can be easily removed from water by using a magnetic field to avoid contamination of surroundings. Reclaimed Fe3O4@Ag nanoparticles can still have antibacterial capability and can be reused.

536 citations

Journal ArticleDOI
TL;DR: In this article, a superparamagnetic model was proposed to explain the properties of a system constituted by small interacting particles (iron grains dispersed in an amorphous alumina matrix), including interparticle interactions, which implies a transition at a temperature of 0 K.
Abstract: The dynamic properties of a system constituted by small interacting particles (iron grains dispersed in an amorphous alumina matrix) have been studied by AC susceptibility measurements at low frequency ( nu =2*10-2 and 2*10-3 Hz). Maxima have been found for the in-phase susceptibility chi ' (at TB) and for the out-of-phase susceptibility chi . The frequency dependence of TB is analysed over a large frequency range, including previous results from AC susceptibility measurements (17

527 citations

Journal ArticleDOI
TL;DR: In this article, it was suggested that the intermediate iron oxide nanoparticles (before aeration) were formed by the competing processes of oxidation and crystal growth after decomposition of Fe(CO)5.
Abstract: Easy preparation of iron oxide nanoparticles [5- and 11-nm maghemite (γ-Fe2O3) and 19-nm magnetite (Fe3O4)] by thermal decomposition of Fe(CO)5 in the presence of residual oxygen of the system and by consecutive aeration were investigated by TEM/HRTEM, XRD, and Mossbauer spectroscopy. Also, the magnetic properties of the nanoparticles were studied by SQUID magnetometer and optical microscopy. It was suggested that the intermediate iron oxide nanoparticles (before aeration) were formed by the competing processes of oxidation and crystal growth after decomposition of Fe(CO)5. At room temperature, the aerated 5-nm particles were superparamagnetic without interaction among the particles, whereas the 19-nm particles were ferrimagnetic. The 11-nm iron oxide nanoparticles were superparamagnetic with some interactions among the particles.

521 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023359
2022693
2021390
2020403
2019468
2018474