Monodisperse superparamagnetic nanoparticles by thermolysis of Fe(III) oleate and mandelate complexes

Size-dependent magnetic properties of iron oxide nanoparticles

“…Nevertheless, the NP1-3 dispersions were colloidaly stable, i.e., the particles did not sediment even after 1 month of the storage. This suggests that an additional mechanism participated in the stabilization that was induced by steric repulsions of the PEG chains [31]. Similar phenomenon was observed with the SC-IO particles NP4 (D h ¼154 nm), where the number of aggregates was higher relative to PEG-IO due to poorer stabilizing efficiency of saccharides.…”

“…Particles sizes from XRD were in good accordance to TEM values (Table 1). Although it is known that the thermal decomposition typically produces magnetite nanoparticles [31], position of 440 reflex (2θ ¼62.5°and 62.9°for magnetite and maghemite, respectively) in XRD spectrum of the NP1-4 nanoparticles confirmed that the magnetic phase consisted of the thermodynamically stable maghemite phase (2θ¼ 62.9°). Τhis was probably induced by oxidation of freshly prepared magnetite with oxygen present in air or water.…”

“…Fe(III) oleate and mandelate were prepared following a standard procedure [31]. Briefly, FeCl 3 Á 6H 2 O (10.8 g; 40 mmol) and sodium oleate (36.5 g; 120 mmol) were dissolved in an ethanol/ water/hexane (80/60/140 v/v/v) mixture (280 ml), which was heated at 70°C for 4 h under magnetic stirring.…”

Surface-Modified Magnetic Nanoparticles for Cell Labeling

“…Chemical and physical properties of magnetic nanoparticles, such as size and size distribution, morphology and surface chemistry, strongly depend on selection of the synthetic method, starting components and their concentration [11,22]. Nanoparticles ranging in size from 1 to 100 nm exhibit superparamagnetic behavior.…”

“…Such particles formed very stable colloids in organic solvents, such as toluene or hexane, but not in water. Magnetic properties of the nanoparticles were described earlier [22].…”