V.F.C. and A.F. contributed equally to this work. The authors thank the FCT—Fundacao para a Ciencia e Tecnologia—for financial support under framework of the Strategic Funding UID/FIS/04650/2013, project PTDC/ EEI-SII/5582/2014 and project UID/EEA/04436/2013 by FEDER funds through the COMPETE 2020—Programa Operacional Competitividade e Internacionalizacao (POCI). Funds provided by FCT in the framework of EuroNanoMed 2016 call, Project LungChek ENMed/0049/2016 are also gratefully acknowledged. V.F.C., A.F., C.R., and P.M. also thank the FCT for the grants SFRH/BPD/98109/2013, SFRH/BPD/104204/2014, SFRH/ BPD/90870/2012 and SFRH/BPD/96227/2013, respectively. Finally, the authors acknowledge funding by the Spanish Ministry of Economy and Competitiveness (MINECO) through the project MAT2016-76039C4-3-R (AEI/FEDER, UE) and from the Basque Government Industry Department under the ELKARTEK program.

Advances in Magnetic Nanoparticles for Biomedical Applications.

Photocatalytic application of spinel ferrite nanoparticles and nanocomposites in wastewater treatment: Review

Advanced nanomaterials in oil and gas industry: Design, application and challenges

Characterization and magnetic properties of cobalt ferrite nanoparticles

The effect of agarose content on the morphology, phase evolution, and magnetic properties of CoFe2O4 nanoparticles prepared by sol-gel autocombustion method

CoFe2O4 nanoparticles were successfully synthesized by reverse micelle microemulsion method. The X-ray diffraction (XRD) results show that all samples have a spinel ferrite structure with calculated crystallite sizes in the range of 3.6–21.7 nm. Increasing calcination temperature from 650 to 900 °C can increase the crystallization of the powders. Transmission electron microscopy (TEM) images reveal the spherical shape of nanoparticles with serious agglomeration. Particle sizes of the samples calcined at 700, 800, and 900 °C estimated from TEM images are 9.7 ± 2.1, 10.6 ± 1.6, and 14.9 ± 0.4 nm, respectively. The UV–visible spectroscopy results show a decrease in the energy band gap (E
 g) from 4.3 to 3.0 eV with increasing crystallite size. The room temperature magnetic properties of the calcined CoFe2O4 nanoparticles performed by vibrating sample magnetometry (VSM) indicate ferrimagnetic behavior in all samples. In addition, the specific magnetizations measured at the maximum field of ±30 kOe (M
 max) and coercivity (H
 c) are increased with increasing calcination temperature. These characteristics of the prepared CoFe2O4 nanoparticles make them a promising magnetically separable photocatalyst for wastewater treatment.

Sathakan Arthan

Papers

Magnetic and Optical Properties of CoFe2O4 Nanoparticles Synthesized by Reverse Micelle Microemulsion Method