Synthesis of monodisperse MFe2O4 (M = Fe and Zn) nanoparticles for polydiethylsiloxane-based ferrofluid with a solvothermal method. (September 2015)

• Record Type: Journal Article
• Authors: Wang, Wei; Zhuang, Lin; Zhang, Yong; Shen, Hui
• Is Part Of: Materials research bulletin. Volume 69(2015:Sep.)
• Page Start: 61
• Page End: 64
• Publication Date: 2015-09
• Subjects: Magnetic materials -- Magnetic properties -- Ferrofluid -- Viscosity; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2014.12.058
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: MFe2 O4 nanoparticles were synthesized through a facile solvothermal method. The relationship between viscosity and temperature of the polydiethylsiloxane-based ferrofluid is discussed. Fe3 O4 nanoparticles have a saturation magnetization of 73.06 emu/g at room temperature. Abstract: Monodisperse MFe2 O4 (M = Fe, Zn) nanoparticles were successfully synthesized for the application of polydiethylsiloxane-based (PDES) ferrofluids (FFs) via a novel solvothermal method, with which 1-octanol and 1-octanamine act as binary solvent, oleic acid (OA) as the surfactant and metal acetylacetonate [M(acac)3 ](M = Fe and Zn) as the metal source. X-ray diffractometer confirms that the resultant nanoparticles are pure MFe2 O4 with a spinel structure. Infrared spectroscopy indicates that oleic acid is bound to the surface of MFe2 O4 through a covalent bond between carboxylate (COO − ) and metal cations. The ratio of 1-octanol and 1-octanamine plays a key role in the formation of the sphere-shaped morphology. Transmission electron microscopy (TEM) images confirm that the Fe3 O4 particles are of 4–11 nm with good monodispersity and a narrow size distribution. The saturation magnetization of Fe3 O4 nanoparticles with sizes of 7 nm can reach up to 73.06 emu/g. Polydiethylsiloxane-based (PDES) FFs show relatively smaller changes of the viscosity with low temperatures (from −7 to 20 °C) than the polydimethylsiloxane-based (PDMS) FFs. For FFs applications, the relationship between viscosity and temperature is also discussed.