Shape Control in Iron Oxide Nanocrystal Synthesis, Induced by Trioctylammonium Ions

2009 ◽  
Vol 21 (7) ◽  
pp. 1326-1332 ◽  
Author(s):  
Alexey Shavel ◽  
Benito Rodríguez-González ◽  
Jessica Pacifico ◽  
Marina Spasova ◽  
Michael Farle ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Shape Control ◽  
Nanocrystal Synthesis

scholarly journals Unravelling the Thermal Decomposition Parameters for The Synthesis of Anisotropic Iron Oxide Nanoparticles

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 881 ◽  
Author(s):  
Geoffrey Cotin ◽  
Céline Kiefer ◽  
Francis Perton ◽  
Dris Ihiawakrim ◽  
Cristina Blanco-Andujar ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Sodium Oleate ◽  
Shape Control ◽  
Oxide Nanoparticles ◽  
Chelating Ligand ◽  
Precursor Structure ◽  
Negative Effect ◽  
Magnetic Resonance Imaging Mri

Iron oxide nanoparticles are widely used as a contrast agent in magnetic resonance imaging (MRI), and may be used as therapeutic agent for magnetic hyperthermia if they display in particular high magnetic anisotropy. Considering the effect of nanoparticles shape on anisotropy, a reproducible shape control of nanoparticles is a current synthesis challenge. By investigating reaction parameters, such as the iron precursor structure, its water content, but also the amount of the surfactant (sodium oleate) reported to control the shape, iron oxide nanoparticles with different shape and composition were obtained, in particular, iron oxide nanoplates. The effect of the surfactant coming from precursor was taking into account by using in house iron stearates bearing either two or three stearate chains and the negative effect of water on shape was confirmed by considering these precursors after their dehydration. Iron stearates with three chains in presence of a ratio sodium oleate/oleic acid 1:1 led mainly to nanocubes presenting a core-shell Fe1−xO@Fe3−xO4 composition. Nanocubes with straight faces were only obtained with dehydrated precursors. Meanwhile, iron stearates with two chains led preferentially to the formation of nanoplates with a ratio sodium oleate/oleic acid 4:1. The rarely reported flat shape of the plates was confirmed with 3D transmission electronic microscopy (TEM) tomography. The investigation of the synthesis mechanisms confirmed the major role of chelating ligand and of the heating rate to drive the cubic shape of nanoparticles and showed that the nanoplate formation would depend mainly on the nucleation step and possibly on the presence of a given ratio of oleic acid and chelating ligand (oleate and/or stearate).

scholarly journals Surfactant-Free Shape Control of Gold Nanoparticles Enabled by Unified Theoretical Framework of Nanocrystal Synthesis

2017 ◽  
Vol 29 (21) ◽  
pp. 1605622 ◽  
Author(s):  
Matthew A. Wall ◽  
Stefan Harmsen ◽  
Soumik Pal ◽  
Lihua Zhang ◽  
Gianluca Arianna ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Shape Control ◽  
Theoretical Framework ◽  
Nanocrystal Synthesis

Shape Control of Iron Oxide Nanoclusters in Polymeric Media

2002 ◽  
Vol 14 (19) ◽  
pp. 1402-1405 ◽  
Author(s):  
R. Tannenbaum ◽  
S. Reich ◽  
C.L. Flenniken ◽  
E.P. Goldberg
Keyword(s):  
Iron Oxide ◽  
Shape Control ◽  
Polymeric Media

Shape control of iron oxide nanoparticles

2009 ◽  
Vol 11 (19) ◽  
pp. 3762 ◽  
Author(s):  
Alexey Shavel ◽  
Luis M. Liz-Marzán
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Shape Control ◽  
Oxide Nanoparticles

Input of Microwaves for Nanocrystal Synthesis and Surface Functionalization Focus on Iron Oxide Nanoparticles

2013 ◽  
pp. 207-245 ◽  
Author(s):  
Irena Milosevic ◽  
Erwann Guenin ◽  
Yoann Lalatonne ◽  
Farah Benyettou ◽  
Caroline de Montferrand ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Surface Functionalization ◽  
Oxide Nanoparticles ◽  
Nanocrystal Synthesis

Size and Shape Control of Gallium-Iron Oxide Nanoparticles

2019 ◽  
Author(s):  
Jacob Steven Mohar ◽  
Ekaterina Dolgopolova ◽  
Jennifer Ann Hollingsworth
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Shape Control ◽  
Oxide Nanoparticles ◽  
Size And Shape

Fatty Acid Salts as Stabilizers in Size- and Shape-Controlled Nanocrystal Synthesis:  The Case of Inverse Spinel Iron Oxide

2007 ◽  
Vol 129 (20) ◽  
pp. 6352-6353 ◽  
Author(s):  
Maksym V. Kovalenko ◽  
Maryna I. Bodnarchuk ◽  
Rainer T. Lechner ◽  
Günter Hesser ◽  
Friedrich Schäffler ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Iron Oxide ◽  
Inverse Spinel ◽  
Size And Shape ◽  
Nanocrystal Synthesis ◽  
Fatty Acid Salts ◽  
Shape Controlled ◽  
Acid Salts
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