A Facile Green Synthesis of Nickel Ferrite Nanoparticles using Tamarindus Indica Seeds for Magnetic and Photocatalytic Studies

Magnetic NiFe2O4 nanoparticle (NFNPs) was synthesized by the microwave-assisted method using Tamarindus indica seeds as a green reducing agent. The identification of NFNPs was carried out by XRD, FTIR, SEM with EDAX analysis, UV-Visible Spectroscopic and luminescence techniques. Spinel structure of NFNPs with a single phase has been confirmed by XRD with an average crystallite size of 21 nm. FTIR confirms the presence of tetrahedral and octahedral sites of prepared NFNPs. SEM with EDAX and TEM gives the information of agglomeration of magnetic nanoparticles with elemental composition present in the NFNPs and spherical nature of nanoparticles with a particle size of 29 nm. The prepared NFNPs are visible active with band gap of 1.92 eV. NFNPs show effective photocatalytic activity under visible light irradiation towards the degradation of anionic Alizarin red S dye and cationic Methylene Blue dye. NFNPs show good magnetic property in VSM studies. The prepared NFNPs can be useful for wastewater treatment.

Magneto-sensitive Carbon-inorganic Composites Based on Particleboard and Plywood Wastes

The conversion of metal-modified (Fe, Co) sawdust into magneto-sensitive porous composites using thermal carbonization process in an inert atmosphere was successfully achieved. The as-prepared samples were characterized using nitrogen adsorption, X-ray diffraction, scanning electron microscopy and thermal analysis methods. The obtained results show that the structural and morphological characteristics of the obtained composites depend strongly on the metal precursor’s types. All samples exhibited a good magnetic property and can be easily separated from liquids by an external magnet.

Novel Magnetic Nanocluster@Graphene Oxide Composites for Potential Application in Environmental Adsorption

Graphene-oxide-wrapped magnetic Fe3O4 nanocluster (NC) composites (MC@GO) were prepared and their characteristics were analyzed by multiple characterization methods. Results indicated that the magnetic NCs (~400 nm in size) were composed of numerous Fe3O4 monocrystalline particles (30–50 nm in size) and MC@GO had stable structure, high saturation magnetization (61 emu/g) and specific surface area of 112.5 m2/g. The magnetic NCs were integrally and tightly encapsulated in the composites by silk-like GO sheets via electrostatic interaction. The formation mechanism for MC@GO is also discussed in detail herein. Fe3+ was reduced by ethylene glycol in the adopted synthesis scheme, to generate Fe3O4 monocrystalline particles that aggregated to form Fe3O4 NCs with rough surfaces. Subsequent SiO2 coating and positive charge introduction caused the GO sheets to firmly wrap around the magnetic NCs, resulting in novel GO wrapped magnetic NC composites. The Fe3O4 NCs contributed much to structure amelioration and performance enhancement of the final GO composites. The rough surfaces of Fe3O4 NCs were beneficial for the SiO2 coating and final wrapping of GO sheets. The good magnetic property and beneficial structure of MC@GO make it an ideal adsorbent, which was demonstrated in the current study using methylene blue (MB) as a model adsorbate. The maximum MB adsorption capacity for MC@GO reached 105.5 mg/g. This is the first study on GO-wrapped Fe3O4 NC composites and their potential use for environmental adsorption. Furthermore, this study provides a method for developing GO wrapped magnetic particle composites by tailoring the magnetic precursor.

Rapidly detecting antibiotics with magnetic nanoparticle coated CdTe quantum dots

A reusable magnetic-quantum dot material with good magnetic property and high fluorescence retention can qualitatively and quantitatively detect four kinds of antibiotics.

Facile synthesis of high dispersion γ-Fe2O3–Au nanoparticles within mesoporous silica spheres

γ-Fe2O3–Au@m-SiO2 composite were successfully prepared by a facile one-pot method, which showed good magnetic property, high nanoparticles dispersion, uniform mesopore size, high surface area and big pore volume.

Oxidative carbonylation of phenol to diphenyl carbonate by Pd/MFe2O4 magnetic catalyst

In order to screen one suitable catalyst for magnetically stabilized fluidized bed (MSFB) reactor in the process of oxidative carbonylation of phenol to diphenyl carbonate (DPC), Pd/MFe2O4 catalysts were chosen, then prepared and characterized by XRD, H2-TPR, XPS and VSM (Vibrating Sample Magnetometer). Compared to the other metal ion doped spinel ferrite catalysts, the catalytic activity of Pd/MnFe2O4 was much higher, which the single pass yield of DPC reached 33.12% with selectivity above 99%, and TOF (turnover frequency) reached 70.56molDPC?(molPd?h)-1.The result showed that the formation of the ferrite oxygen-deficient and ion transference in the ferrites was in favor of the catalytic activity. When the support MnFe2O4 was calcinated at 500?C, the saturation magnetization of the obtained catalyst Pd/MnFe2O4 came up to 43.1 A?m2?kg-1. With good magnetic property and brilliant catalytic activity the catalyst Pd/MnFe2O4 may suite for industrial experiments in MSFB reactor in future.

Ga-based magnetic fluid with Al2O3-coated Ni nanoparticles

Ga-based magnetic fluid with Al2O3-coated Ni nanoparticles is prepared successfully and it shows good magnetic property as well as strong stability.

Synthesis of Fluorescent Magnetic and Plasmonic-Hybrid Multifunctional Nanopaticles

FeAu/ZnO nanoparticles were successfully synthesized by nanoemulsion process with the use of poly (ethylene glycol)-block-poly (propylene glycol)-block-poly (ethylene glycol) as the surfactant. The characterization of the FeAu/ZnO nanoparticles was performed using X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and UV-visible absorption spectroscopy, showing that the polymer-laced nanoparticles reveal high crystallinity, excellent dispersibility and well defined optical performance. The process of solvent dispersion-collection of FeAu/ZnO nanoparticles indicates that the nanoparticles possess good magnetic property for applications.

Influence of Pre-Sintering Temperature and Time on the Properties of YIG Target

The influence of pre-sintering temperature and time, which ranged from 700 to 900°C and from 0.5 to 12h respectively, on the size and shape of the grains composed of YIG target were studied. The YIG precursors, of which the crystallization temperature was obtained by the DSC tests, were synthesized through the chemical co-precipitation method. According to the XRD, SEM and VSM measurement results, YIG powders pre-sintered at 750°C for 7hours, which temperature is lower than the crystallization temperature, can make the target with the highest density, good magnetic property, fine-grained and narrow grain size distribution.