We have studied the magnetic properties and the composition of cobalt ferrite single crystal films on SrTiO3 : Nb grown by infrared pulsed-laser deposition. Mössbauer spectra have been recorded from both the target used to grow the films and the films themselves. The Mössbauer spectra of the target taken at low temperatures show a strong dependence of the recoil free fraction of the octahedral ...

In this study, an Co/Fe coated porcelain using a cobalt and ferrous sulfate was sintered at 1,250 °C. The specimens were investigated by HR-XRD, FE-SEM (EDS), Dilatometer, UV-vis spectrophotometer. surface of the uniformly fused with pigment, white ware celadon body densely to certain thickness from surface. Other new compounds produced chemical reaction cobalt/ferrous during sintering process....

Ferrite nanoparticles were synthesized at around 4°C~25°C and coated during the synthesis process with biocompatible and biodegradable polymers, dextran or chitosan. The size of ferrite nanoparticles was determined to be 7.51nm by DLS (Dynamic Light Scattering) and TEM (Transmission Electron Microscope). The size of coated nanoparticles was increased up to 128.6nm and 67nm for dextran and chito...

Highly dispersed cobalt-silicon mixed oxide [Co-SiO2] nanosphere was successfully prepared with a modified reverse-phase microemulsion method. This material was characterized in detail by X-ray diffraction, transmission electron microscopy, Fourier transform infrared, ultraviolet-visible diffuse reflectance spectra, X-ray absorption spectroscopy near-edge structure, and N2 adsorption-desorption...

A. Lisfi,1,* C. M. Williams,1 L. T. Nguyen,2 J. C. Lodder,2 A. Coleman,1 H. Corcoran,1 A. Johnson,1 P. Chang,1 A. Kumar,1 and W. Morgan1 1Department of Physics, Morgan State University, 1700 E. Cold Spring Lane, Baltimore, Maryland 21251, USA 2SMI, MESA Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands Received 27 March 2007; revised manuscript ...

Cobalt ferrite (CoFe2O4) has been synthesized by a solid-state mechanothermal process, and its molar heat capacity has been determined. A stoichiometric mixture of CoC2O4 · 2H2O and FeC2O4 · 2H2O was subjected to a combination of mechanical activation (by high-energy milling) and thermal activation (by annealing at temperatures between 300 and 700 ◦C). The process was followed by thermogravimet...

In this study, silica coated Au nanospheres (Au@SiO2) were prepared by a reverse microemulsion method; subsequently, a layer of fluorescent quantum dots (QDs) were adsorbed onto it and then it was coated with silica again. After modifying with PVP, the composite silica coated gold nanosphere and quantum dots nanoparticle (Au@SiO2-QDs/SiO2-PVP) was obtained. This composite structure contained Au...

Three-phase composite films consisting of BaTiO3/singlewalled carbon nanotube (SWCNT)/polymer were fabricated. The SWCNTs were shortened and coated with SiO2 to minimise the conducting paths of the SWCNTs in the film. The film showed a dielectric constant and dielectric loss of 92 and 0.031, respectively, at a frequency of 1 kHz. The SiO2-coated short SWCNTs can play important roles in enhancin...