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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Water-Based Metallic Nickel Magnetic Fluids

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Viali, Wesley Renato [1] ; de Assis, Douglas Ricardo [1] ; do Couto, Giselle Giovanna [1] ; Melo, Wellington W. M. [2] ; Novak, Miguel Alexandre [3] ; Jafelicci Junior, Miguel [1]
Total Authors: 6
[1] Univ Estadual Paulista, Inst Quim, Lab Mat Magnet & Coloides, BR-14801970 Araraquara, SP - Brazil
[2] Ctr Fed Educ Tecnol Celso Suckow da Fonseca, BR-26041271 Niteroi, RJ - Brazil
[3] Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, RJ - Brazil
Total Affiliations: 3
Document type: Journal article
Source: JOURNAL OF NANOFLUIDS; v. 7, n. 1, p. 21-25, FEB 2018.
Web of Science Citations: 0

In this work, a metallic nickel water-based magnetic fluid was characterized and its colloidal stability was evaluated over 300 days. Magnetic fluids are colloidal suspensions of a solid phase, usually, nanoparticles dispersed in a liquid, which combines normal liquid behavior and magnetic properties. We report a new route to obtain an aqueous magnetic fluid containing metallic nickel nanoparticles coated with citrate without any further modification of its surface. The citrate-coated Ni nanoparticles were synthesized via a one-pot route by reducing Ni2+ ions with sodium borohydride in presence of citric acid. The Ni nanoparticles were dispersed in O-2-free water to obtain the magnetic fluid. The structural and morphological characterization of the Ni NP were obtained by high-resolution transmission electron microscopy and X-ray diffraction. Magnetic curves were measured using a SQUID-based magnetometer. The colloidal stability of the Ni magnetic fluid was evaluated by dynamic light scattering and zeta potential measurements. The NP had spherical morphology with a diameter of 4.2 +/- 0.7 nm, and the XRD peaks were consistent with a Ni fcc structure. The M-H curve demonstrates superparamagnetic behavior with a magnetization of 6.7 emu/g at 60 KOe and 290 K. The calculated magnetic diameter was 4.18 nm. The hydrodynamic diameter and zeta potential of the MF were measured over 300 days, and no significant changes were observed, which indicates good colloidal stability. (AU)

FAPESP's process: 15/12638-5 - Nanofluids synthesis based on copper nanoparticles and silver nanostructures core@shell for applications as heat exchangers fluids
Grantee:Miguel Jafelicci Junior
Support Opportunities: Regular Research Grants