Water-Based Metallic Nickel Magnetic Fluids

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF NANOFLUIDS; v. 7, n. 1, p. 21-25, FEB 2018.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 15/12638-5 - Síntese de nanofluidos baseados em nanopartículas de cobre e prata e nanoestruturas core@shell para aplicações como fluidos trocadores de calor
• Beneficiário: Miguel Jafelicci Junior
• Modalidade de apoio: Auxílio à Pesquisa - Regular