Reverse Micelle Synthesis and Characterization of Superparamagnetic MnFe₂O₄ Spinel Ferrite Nanocrystallites

Abstract

MnFe2O4 nanoparticles are synthesized by using sodium dodecylbenzenesulfonate (NaDBS) to form water-in-toluene reverse micelles. The nanoparticles are single crystalline, and the average particle size can be controlled from 4 to 15 nm. High- and low-resolution transmission electron microscopy characterization has shown that the nanoparticles can have a size distribution as narrow as ∼9%. Neutron diffraction and magnetic measurements have been conducted on the nanoparticles with a diameter of 7.7 ± 0.7 nm. The results unambiguously prove that these MnFe2O4 nanoparticles are truly superparamagnetic. The synthesis and characterization of these nanoparticles will facilitate the development of MnFe2O4 nanoparticles for the potential applications such as contrast enhancement agents of magnetic resonance imaging and magnetic carriers for site-specific drug delivery.

Microwave Assisted Combustion Synthesis and Characterization of Nanocrystalline Nickel-doped Cobalt Ferrites

“…where: D BET is the equivalent spherical diameter (nm), D t is the theoretical density (g/cm 3 ), and S BET is the surface area (m 2 /g). To analyze the magnetic properties at room temperature, magnetization as a function of the magnetic field was measured using an EG&G PAR 4500 vibrating sample magnetometer (VSM) coupled to an electromagnet operating in a maximum range of 10 kOe.…”

“…Attention has focused on the preparation and characterization of superparamagnetic nanoparticles of metal oxides and spinel ferrites (MFe 2 O 4 ) (M=Co, Mg, Mn, Ni, etc.) [1][2][3][4] . To minimize the difficulties posed by the mixed oxide method, various methods of chemical synthesis have been used in the laboratory to obtain ferrites, mainly in order to control their microstructure and magnetic properties by controlling characteristics such as purity, chemical homogeneity, shape and mean particle size of powders [3][4][5][6] .…”

“…[1][2][3][4] . To minimize the difficulties posed by the mixed oxide method, various methods of chemical synthesis have been used in the laboratory to obtain ferrites, mainly in order to control their microstructure and magnetic properties by controlling characteristics such as purity, chemical homogeneity, shape and mean particle size of powders [3][4][5][6] . In the past decade, the solution combustion method was widely used to synthesize single or mixed metal oxides [7][8][9][10][11][12] .…”

Role of polymeric surfactants on the growth of manganese ferrite nanoparticles

“…Manganese ferrite nanoparticles with different sizes and morphologies have been synthesized by different methods. Some of these methods include ball milling [20], co-precipitation of Mn 2+ and Fe 3+ in aqueous solution [21], reverse micelle [22,23], thermal decomposition [24][25][26][27], and solvothermal method [19]. The last method offers many advantages over the others such as its simplicity, high crystallinity of the products, capability to control the crystal growth and its adequacy for the preparation of large quantities of samples [19].…”

Microwave-induced combustion synthesis and characterization of NixCo1−xFe2O4 nanocrystals (x = 0.0, 0.4, 0.6, 0.8, 1.0)

“…[1][2][3][4]. A variety of wet chemical methods (solgel, co-precipitation, hydrothermal, aerosol etc.)…”