Characterization of different magnetite–cobalt nanoparticles in hydrocarbon-based magnetic fluids by means of static and dynamic magnetization measurements |
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| Authors: | Oscar Ayala-Valenzuela Paul C Fannin Rebeca Betancourt-Galindo Oliverio Rodríguez-Fernández José Matutes-Aquino |
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| Institution: | 1. Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna Hermosillo 140, Apto. Postal 379, Saltillo, Coah. 25100, México;2. Centro de Investigación en Materiales Avanzados, S. C., Miguel de Cervantes 120, Complejo Industrial Chihuahua, Chihuahua, Chih. 31109, México;3. Departament of Electronic and Electrical Engineering, Trinity College, Dublin 2, Ireland |
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| Abstract: | Magnetic nanoparticles with different compositions (CoxFe3−xO4, 0?x?0.1) were synthesized from metal salts using a coprecipitation technique to produce magnetic fluids following a peptization technique. The liquid carrier was the hydrocarbon Isopar M and the surfactant was oleic acid. The colloidal-sized ferrimagnetic nanoparticles produced were found to be superparamagnetic. Measurements of the complex magnetic susceptibility were carried out to evaluate the resonant frequency fres, the anisotropy constant K, and anisotropy field HA. fres was found to be a linear function of the cobalt content of the magnetic nanoparticles over the range of cobalt content studied. |
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| Keywords: | 75 50 Mm 76 50 +g |
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