Synthesis, characterization and self‐assemblies of magnetite nanoparticles

Abstract

Monodisperse Fe 3 O 4 nanoparticles (NPs) with a narrow size distribution were synthesized by a hightemperature solution-phase method. The diameter of magnetic NPs was tuned from 2 to 13 nm by varying the reaction conditions, and the monolayer and multilayer self-assemblies of the NPs were obtained. A few kinds of the assemblies are presented and the reasons that drive the particles to form the superlattices are discussed. The physical-property-measurement system (PPMS) results showed that the as-synthesized NPs are ferrimagnetic at low temperatures (5 K) while they are superparamagnetic at room temperature (300 K). In addition, the particles were transformed into hydrophilic ones by an exchange reaction.

Formation, characterization, and magnetic properties of Fe3O4 microoctahedrons

“…The figures show that the peaks located at 710.5 and 724.2 eV correspond to Fe2p 3/2 and Fe2p 1/2 , and the peaks of 531.9 eV could be attributed to O1s. The data are also consistent with the reported values of Fe 3 O 4 in the literature [22].…”

Synthesis of Fe3O4 nanoparticles without inert gas protection used as precursors of magnetic fluids

“…Chen and Xu [7] hydrothermally synthesized nanocrystalline Fe 3 O 4 powders from iron (P) 2-methoxy ethoxides (Fe(OMOE) 2 ), using 2-methoxyethanol (MOE)-water mixed solvent as the reaction medium. Yang et al [8] carried out a hydrothermal process to obtain monodispersed Fe 3 O 4 nanoparticles in Fe(acac) 3 , 1,2-dodecanediol, oleic acid and oleylamine (2:5:3:3 in mol) mixed phenyl ether solution. Jiang and Kim [9] synthesized iron oxide nanocomposites from thermal decomposition of iron(P) acetylacetonate in organic medium, in the presence of linear o-functionalized polystyrenes.…”

Mesoporous Spherical Li4Ti5O12 as High‐Performance Anodes for Lithium‐Ion Batteries

“…For comparison, the LTO-SG was also prepared by a sol-gel method following a previously published procedure. [22] Details can be seen in the Supporting Information.…”