Magnetic nanoparticles have attracted much research interest in the past decades due to their potential applications in microwave devices. Here, we adopted a novel technique to tune cut-off frequency exceeding the natural resonance frequency limit of monodisperse Fe3O4 nanoparticles via superparamagnetic relaxation. We observed that the cut-off frequency can be enhanced from 5.3 GHz for Fe3O4 t...

The nano-Fe3O4 particles were prepared by hydrothermal method. Cellulose-based magnetic Fe3O4 was prepared by adding cellulose solution dissolved in sodium hydroxide / thiourea / urea system. The basic protease was used as the catalyst and glutaraldehyde was used as the crosslinking agent, The production of magnetic recyclable immobilized enzyme can greatly reduce the cost of hydrolysis of slud...

Nearly monodispersed yolk-type Au@Fe3O4@C nanospheres with hollow cores of 50 nm in diameter were prepared through coating Au@SiO2 nanoparticles with Fe3O4@C double layers, followed by dissolving SiO2. The cytotoxicity of the nanospheres was evaluated by MTT assay, demonstrating a high biocompatibility. The yolk-type nanospheres show a high DOX loading content of 1237 mg g(-1). The coexistence ...

Gold (Au)-decorated iron oxide (Fe3O4), Au/Fe3O4, Janus nanoparticles were fabricated via the continuous route for aerosol Au incorporation with Fe3O4 domains synthesized in an aqueous medium as multifunctional nanoplatforms. The fabricated nanoparticles were subsequently exposed to 185-nm UV light to generate positive charges on Au surfaces, and their activities were tested in computed tomogra...

conclusions based on our results, the administration of fe3o4-nps causes dose dependent adverse effects on liver. background because of their unique magnetic properties, fe3o4 nanoparticles (fe3o4-nps) have extensive applications in various biomedical aspects. investigation of the possible adverse aspects of these particles has lagged far behind their fast growing application. objectives the cu...

We report a facile synthesis of bifunctional Fe3O4-Ag(125)I heterodimers for use as dual-modality imaging agents in magnetic resonance (MR) and single-photon emission computed tomography (SPECT). We introduced (125)I, which is a clinically used radioisotope, as a SPECT reporter, into Fe3O4-Ag heterodimer nanoparticles to provide a new type of bifunctional contrast agent for MRI and SPECT imaging.

Spin-polarized photoelectron spectroscopy has been used to study the candidate half metal Fe3O4. By using higher photon energies we can study polarization in ‘‘as received’’ samples, essentially ‘‘looking through’’ the disrupted surface. Our data agree with theoretical calculations for Fe3O4 but exhibit a lowered polarization. ! 2002 Elsevier Science B.V. All rights reserved.

In the present study, we developed a relatively simple way to incorporate magnetic nanoparticles into electrospun ultrafine fibers of poly(3-hydroxybutyrate) (PHB) by combining electrospinning with in situ co-precipitation. Using this approach, we achieved uniform dispersal of Fe3O4 nanoparticles along the fibrous surface. The formation of Fe3O4 nanoparticles on the fiber surface and the partic...

This paper describes a simple and environmentally friendly method for the preparation of highly stable dispersions of Fe3O4 nanoparticles with controlled morphologies, in the same synthesis system for the first time. During the process, the Fe3O4 nanoparticles are formed using urease as a multifunctional reagent, including catalyst, template and dispersant, due to its enzymatic activity and spe...

With the rapid development of nanotechnology and widespread use of nanoproducts, concerns have arisen regarding the ecotoxicity of these materials. In this paper, the photosynthetic toxicity and oxidative damage induced by nanoFe3O4 on a model organism, Chlorella vulgaris (C. vulgaris) in aquatic environment, were studied. The results showed that nano-Fe3O4 was toxic to C. vulgaris and affected...