Precise control over shape and size of iron oxide nanocrystals suitable for assembly into ordered particle arrays

Abstract

Here we demonstrate how monodisperse iron oxide nanocubes and nanospheres with average sizes between 5 and 27 nm can be synthesized by thermal decomposition. The relative importance of the purity of the reactants, the ratio of oleic acid and sodium oleate, the maximum temperature, and the rate of temperature increase, on robust and reproducible size and shape-selective iron oxide nanoparticle synthesis are identified and discussed. The synthesis conditions that generate highly monodisperse iron oxide nanocubes suitable for producing large ordered arrays, or mesocrystals are described in detail.

Ligand Versatility in Supercrystal Formation

“…All mentioned systems in this section contain long‐chain uncharged organic molecules as surfactants. There are three main ligands, which are used in the majority of the experiments: OA, OAm, and DDT (overview in Figure ). OA and OAm have the same carbon chain with 18 carbon atoms and a cis double bond at C9.…”

Quasi-2d fluids of dipolar superballs in an external field

“…A protocol for the formation of hollow silica cubes was presented by Rossi et al 18 In their work, they also demonstrated the formation of cubic crystals under attractive interactions by the addition of a depletant. 20 nm size from ion oleate precursors, Rossi et al 18 and Wetterskog et al 21 synthesized hematite superballs of ca. Magnetic cubes and superballs of different experimental origin have been synthesized and their properties in solution have been determined and complemented by simulation studies.…”

Interfacial strain and defects in asymmetric Fe–Mn oxide hybrid nanoparticles

“…47 Briefly, in a 100 mL three-necked flask, 10 mmol of the iron oleate precursor is dissolved in 1-octadecene to obtain a volume of 50 mL and 8.85 mmol of eicosane, 0.25 mmol of oleic acid, and 0.25 mmol of sodium oleate are added under vigorous magnetic stirring. 47 Briefly, in a 100 mL three-necked flask, 10 mmol of the iron oleate precursor is dissolved in 1-octadecene to obtain a volume of 50 mL and 8.85 mmol of eicosane, 0.25 mmol of oleic acid, and 0.25 mmol of sodium oleate are added under vigorous magnetic stirring.…”