Magnetic properties of prussian blue modified Fe3O4 nanocubes (original) (raw)
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Synthesis and magnetic properties of prussian blue modified Fe nanoparticles
Journal of Magnetism and Magnetic Materials, 2013
Fe nanoparticles are prepared using a unique polyol process and modified with prussian blue (PB) at various concentrations. The presence of PB in the Fe nanoparticles are confirmed from thermal, Fourier transform infrared spectroscopy and electron microscopic analyses. The prussian blue existed on ;the surface of the nanoparticles when the concentration is 200 μM and in excess with 1000 μM. ;Fe nanoparticles are reduced in size using Pt as nucleating agent and modified with the optimum concentration of PB. The saturation magnetization decreases with the concentration of PB whereas the coercivity is influenced by the size of the Fe nanoparticles. The presence of oxide layer in Fe nanoparticles helps in the surface modification with PB. The Fe nanoparticles of particle size 53 nm modified with 200 μM of PB showed a saturation magnetization of 110 emu/g. The magnetic properties suggest that the PB modified Fe nanoparticles are better candidates for detoxification applications.
SYNTHESIS AND CHARACTERIZATION OF Fe, Mn AND SUPER PARAMAGNETIC MAGNETITE Fe 3 O 4 NANOPARTICLES
Ion exchange polymer is a matrix normally insoluble and in the form of small beads having diameters of 300 - 1200 ?m, fabricated from organic substrates. This paper deal with three different types of strong acid cation exchanger resins (PUROLITE C-145, DOSHIONCSA 29 and AMBERLIT IR 120 H resin), which have highly developed structure of pores on the surface and the framework contains some active sites. Active sites of strong acid cation exchanger resins are generally charged with H+? or Na+?.The previous three strong acid cation exchanger resins are used as support through the simple chemical–thermal technique.to produce a hybrid spherical macro porous polymeric cation exchanger beads within which HMO (where M=Fe &Mn) particles (Fe, Mnandsuper paramagnetic magnetite Fe3O4NanowafersNanoparticles (SPMM Fe3O4 NWNPs). To characterize thesize, shape and strong magnetic of magnetite, porous of these Nanoparticles using Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD) and Fourier Transform Infrared spectroscopy (FTIR), Magnetic Susceptibility Balance (MSB).The average particle size of Nanoparticles was calculated from the XRD study. The average particle size of Fe NPs was 2.3-6.6 nm, MnNPs was 2.6-65.5 nm and Fe3O4NPs (DOSHIONCSA 29) was 16-56.5 nm,Fe3O4NPs (AMBERLIT IR 120 H) was 2.9-33.2 nm. Their unique properties make it possible to envision a series of in partial or complete removal of hazardous pollutants in industrial wastewater, which will be published in a follow up publications.
Preparation of Fe 3 O 4 Nanoparticles and Removal of Methylene Blue through Adsorption
Journal of Physics: Conference Series, 2015
In this work, we studied the catalytic activity, structural properties, and behavior of a Fe 3 O 4 magnetic system. The Fe 3 O 4 nanoparticles were prepared by the thermal decomposition method. X-ray diffraction confirmed the presence of a structural Fe 3 O 4 phase, where acicular shape of the grains is shown. Transmission Mössbauer spectroscopy showed a wide distribution of particle sizes at room temperature, some of these present superparamagnetic behavior and are responsible of paramagnetic sites. The hysteresis loops obtained by the use of a vibrating sample magnetometer showed that these nanoparticles exhibit superparamagnetic behavior. However, the cycles present a significant contribution from a ferrimagnetic component at 2 K, which agrees with Mössbauer results. Through scanning electron microscopy, a tendency to the agglomeration of nanoparticles was observed. Nanoparticle activity in the degradation of methylene blue (MB) was studied through fluorescence spectroscopy, finding dye adsorption properties.
Preparation and Characterization Iron Oxide (Fe3O4) Magnetic Nano Particle
2019
Introduction: Nanotechnology is enabling technology that deals with Nano-meter sized objects. It is expected that nanotechnology will be developed at several levels: Materials, devices and systems. The nanomaterial’s level is the most advanced at present, both in scientific knowledge and in commercial applications. A decade ago, nanoparticles were studied because of their size-dependent physical and chemical properties. Aim: To consider magnetite nanoparticles, their applications, synthesis and characterization methods; to synthesis magnetite nanoparticles; to characterize magnetite nanoparticles by different techniques. Materials and methods: The most conventional method for obtaining Fe3O4 or γ-Fe2O3 is by co-precipitation. This method consists of mixing ferric and ferrous ions in a 1:2 molar ratio in highly basic solutions at room temperature or at elevated temperature. Results and discussion: Particle size is measured by zetasizer. The average distribution of magnetic nanopartic...
A review of Structure, Properties, and Chemical Synthesis of Magnetite Nanoparticles
Journal of applied sciences and nanotechnology, 2023
In recent years, extensive studies have been devoted to iron oxide nanoparticles (IONPs). Iron oxides are chemical compounds that have various polymorphic forms, including maghemite (γ-Fe2O3), magnetite (Fe3O4), and Hematite (α-Fe2O3). Among them, the most important studied is magnetite (Fe3O4) due to its low cost and low toxicity and its unique magnetic and physicochemical characteristics, which qualify it for use in various biomedical and technological applications. Magnetic particles should be small and have a narrow size distribution for these applications. The smaller the size of the iron oxide particles, the greater their reactivity and biodegradability. In this review, we display summary information on magnetite (Fe3O4) nanoparticles in terms of structure, characteristics, and preparation methods. Because the prepared strategy has been proven to be critical for preferable control of the particle size and shape, in addition to producing monodispersed magnetite (Fe3O4) nanoparticles with a direct effect on their characteristics and applications, special attention will be placed on chemical preparation techniques including Hydrothermal synthesis, Coprecipitation technique, Sol-Gel process, and thermal decomposition method. This review offers specific information for selecting appropriate synthetic methods for obtaining appropriate sizes, shapes, and magnetic properties of magnetite (Fe3O4) nanoparticles (NPs) for target applications.
Chemistry of Materials, 2005
Magnetite (Fe 3 O 4) nanoparticles modified with electroactive Prussian Blue (PB) were first synthesized by a simple chemical method. Transmission electronic microscopy showed that the average size of the sample was about 12 nm, and X-ray powder diffraction, X-ray photoelectron spectroscopy, Fouriertransform IR, and UV-vis spectra showed the spinel structure for the nanoparticles and confirmed the existence of PB on the surface of Fe 3 O 4. Magnetic properties of the sample were investigated by lowfield alternating current susceptibility and superconducting quantum interference device measurement; the results indicated that the superparamagnetic properties remain for the sample with almost immeasurable remanence and coercivity at room temperature, while the value of saturation magnetization (Ms) reduces, and the blocking temperature (T B) of PB modified Fe 3 O 4 is around 150 K, lower than that of the pure Fe 3 O 4 nanoparticles, so the interaction between the particles is decreased. More interesting, when at 5 K, the Ms of PB-modified Fe 3 O 4 is greatly larger than that at 300 K and shows ferromagnetic behavior. Furthermore, PB-modified Fe 3 O 4 nanoparticles have been immobilized on the surface of glassy carbon electrode and applied to construct a sensor, it showed two well-defined pairs of redox peaks and a dramatic catalysis for the reduction of H 2 O 2 , which might be exploited to develop a new type of biosensor without any mediator.
Prussian blue modified iron oxide magnetic nanoparticles and their high peroxidase-like activity
Journal of Materials Chemistry, 2010
Prussian blue (PB) modified g-Fe 2 O 3 magnetic nanoparticles (MNPs) featuring varying PB proportions were synthesized and characterized by TEM, FTIR, UV-vis, EDS, XRD and XPS. The magnetic properties and peroxidase-like catalytic activity of the synthesized nanoparticles were investigated. With increasing PB content, the magnetism could still maintain a high level. Peroxidase-like activity was enhanced as the PB proportion increased. Catalysis was found to follow Michaelis-Menten kinetics. The calculated kinetic parameters exhibited strong affinity with substrates and high catalytic activity, which are three orders of magnitudes larger than that for magnetite nanoparticles of similar size. Based on the high activity, an enzyme immunoassay model was established: staphylococcal protein A (SPA) was conjugated onto the surface of the nanoparticles to construct a new nanoprobe which was employed to detect IgG immobilized to 96-well plates. The results presented a linear absorbance enhancement with concentration of IgG, suggesting that PBMNPs serve as an inexpensive horseradish peroxidase (HRP) mimic enzyme with potential applications in bio-detection. 25-83272496 † Electronic supplementary information (ESI) available: (1) Tables for establishment of immunoassay and element ratio of iron and nitrogen (EDS results); (2) UV-vis spectra of PBMNPs before and after the color reaction. See
Magnetite (Fe3O4) - Synthesis, Functionalization and its Application
International Journal of Food and Allied Sciences, 2018
Nanoparticles are smaller than 100nm. Size of particle depends upon the method that is used for synthesis of nanoparticles. Magnetic nanoparticles consist of iron, cobalt and nickel and their chemical compounds. Their safety or toxicity is major concern for use in food. Magnetite, hematite and meghemite are types of magnetic nanoparticles. Magnetite (Fe3O4) common among the magnetic iron oxide nanoparticle that is used in food industry. Magnetite is getting popular due to its super paramagnetic properties and lack of toxicity to humans. Different methods are used to synthesize magnetic nanoparticles. Upon contact with air these particles loses magnetism and mono-dispersibility. To overcome this problem these nanoparticles are coated with natural or synthetic polymers, metals, organic and inorganic substances to create stable and hydrophilic nanostructures. Due to easy separation with magnet these magnetic nanoparticles are used as an affinity probe to remove bacteria from different ...
Recent progress in Fe3O4based magnetic nanoparticles: from synthesis to application
Materials Science and Technology, 2016
Fe 3 O 4 based magnetic polymer nanoparticles (MPNPs) are densely studied for several decades. These Fe 3 O 4 based MPNPs can be used in wastewater treatment and biological field such as magnetic resonance imaging contrast agents, hyperthermia therapy and protein separation. The Fe 3 O 4 based MPNPs are attractive because they combine the advantages of magnetism and polymers together. In order to obtain the practical application in the above mentioned areas, the bare Fe 3 O 4 needs to be functionalised with different kinds of molecules like organic small molecules and polymers and some inorganic molecules like silica, metals and carbon. In this review, the chemical preparation methods, different modification methods and various applications of the Fe 3 O 4 based MPNPs are introduced.