Screen-printing of ferrite magnetic nanoparticles produced by carbon combustion synthesis of oxides

Abstract

The feasibility of screen-printing process of hard ferrite magnetic nanoparticles produced by carbon combustion synthesis of oxides (CCSO) is investigated. In CCSO, the exothermic oxidation of carbon generates a smolder thermal reaction wave that propagates through the solid reactant mixture converting it to the desired oxides. The complete conversion of hexaferrites occurs using reactant mixtures containing 11 wt. % of carbon. The BaFe 12 O 19 and SrFe 12 O 19 hexaferrites had hard magnetic properties with coercivity of 3 and 4.5 kOe, respectively. It was shown that the synthesized nanoparticles could be used to fabricate permanent magnet structures by consolidating them using screen-printing techniques. V

A Novel Approach to Improve Properties of BiFeO3 Nanomultiferroics

“…35 With further reduction in nanoparticles size as observed in BIFTO sample (~14 nm), the surface-to-volume ratio increases and the uncompensated surface spins become more significant which enhance the tangible contribution to particle's overall magnetization. 37,38 So far, we have observed an enhanced ferromagnetic property for BIFTO sample, this improvement is expected to result in large magnetoelectric coupling at room temperature. 5).…”

“…36 The decrease in coercivity for codoped samples can be explained on the basis of small contribution from magnetocrystalline anisotropy and thermal effects due to monodomain nature of these nanoparticles. 37,38 So far, we have observed an enhanced ferromagnetic property for BIFTO sample, this improvement is expected to result in large magnetoelectric coupling at room temperature. This is because the codoping effect provides an indirect evidence of enhanced ME effect due to increased saturation magnetization as a result of collapse of space modulated spin structure at room temperature.…”

Solubilization, dispersion and stabilization of magnetic nanoparticles in water and non-aqueous solvents: recent trends

“…or with inorganic materials (silica, 42,43 metals, 44 metal oxides or suldes 45 ) are the most common in order to obtain soluble MNPs. Other techniques for the preparation of soluble or insoluble MNPs include coprecipitation, 46 synthesis in reverse micelles, 47 sonolysis, 48 electrochemical deposition, 49 mechanochemical dispersion, 50 solution plasma 51 and sol-gel processes, 52 arc discharge, 53 spray 54 and laser 55 pyrolysis, ow injection synthesis, 56 thermal decomposition, 57 hydrothermal, 58,59 microwave 60 and microwave solvothermal, 61 combustion synthesis, 62 high-temperature annealing 63 and other high temperature syntheses, 64 micro- 65 and nanoreactors such as protein cages, 66 vesicles, 67 and microemulsions. 68 In terms of the advantages and disadvantages for preparing iron oxide nanoparticles (IONPs), regarding their size and morphology control, thermal decomposition by the hydrothermal synthetic route seems to be the optimal method.…”

Designed Assembly and Integration of Colloidal Nanocrystals for Device Applications

“…To prevent any leakages crossing the designed pattern, the ink for the screen printing must have a certain viscosity. Polymers such as poly(methyl methacrylate) are often used as binders with the NCs in the ink to better adhere them to each other and to the substrate . For screen printing, the film thickness (μm), d , is expressed by Equation : where k d is the deposition yield, V is the volume of the solution (mL), A is the open area of the screen (m 2 ), c is the concentration of the NCs in the solution (kg m −3 ), and ρ is the density of the material in the NC film (kg m −3 ).…”