Standardizing Size- and Shape-Controlled Synthesis of Monodisperse Magnetite (Fe3O4) Nanocrystals by Identifying and Exploiting Effects of Organic Impurities

Standardizing Size- and Shape-Controlled Synthesis of Monodisperse Magnetite Nanocrystals by Identifying and Exploiting Effects of Organic Impurities.

Liang Qiao, Zheng Fu, Ji Li, John Ghosen, Ming Zeng, John Stebbins, Paras N. Prasad, and Mark T. Swihart

ACS Nano 11, 6370 (2017)

NP for Cancer diagnosis and treatment: Review

Magnetite nanoparticles for cancer diagnosis, treatment, and treatment monitoring: recent advances.

Richard A. Revia, 

Miqin Zhang

Materials Today 19, 157 (2016)

Magnetization dynamics in individual magnetite nanocrystals

Probing magnetization dynamics in individual magnetite nanocrystals using magnetoresistive scanning tunneling microscopy.
Amir Hevroni, Boris Tsukerman, and Gil Markovich
Phys. Rev. B 92, 224423 (2015)

(a), (d), and (g) Current vs time measurements performed on the three particles. Each particle was examined at a different temperature (indicated on the figure). In the case of particle 3, the graph shown is one of five consecutive measurements. (b), (e), and (h) Constant current STM topography images of the three particles. (c), (f), and (i) Height profiles of the measured particles, which are marked by arrows.

Hollow magnetite NPs for Li storage

Formation of Uniform Fe3O4 Hollow Spheres Organized by Ultrathin Nanosheets and Their Excellent Lithium Storage Properties.

Fei-Xiang Ma, Han Hu, Hao Bin Wu, Cheng-Yan Xu, Zhichuan Xu, Liang Zhen and Xiong Wen (David) Lou

Advanced Materials 27, 4097 (2015) 

Exchange bias in Au-Fe3O4 dumbbell NPs

Exchange bias effect in Au-Fe3O4 dumbbell nanoparticles induced by the charge transfer from gold.
Mikhail Feygenson, John C. Bauer, Zheng Gai, Carlos Marques, Meigan C. Aronson, Xiaowei Teng, Dong Su, Vesna Stanic, Volker S. Urban, Kevin A. Beyer, and Sheng Dai
Phys. Rev. B 92, 054416 (2015)

Temperature-dependent ZFC and FC magnetizations for (a) Au-4 sample and (b) free solution of Fe3O4 and Au nanoparticles. The field-dependent magnetization measured after field cooling in 50 kOe from 300 K for (c) Au-4 and (d) reference samples at various temperatures. Inset: the same plot at lower fields, showing no horizontal shift of the hysteresis loop.

Size dependent Verwey transition

Size Dependence of Metal–Insulator Transition in Stoichiometric Fe3O4 Nanocrystals.
Jisoo Lee, Soon Gu Kwon, Je-Geun Park, and Taeghwan Hyeon
Nano Lett. 15, 4337 (2015)

Size dependence of T_V for Fe₃O₄ NCs. The contour plot represents the heat capacity data after removing the contribution of surfactant. The symbols mark the Verwey transition temperature (T_V) determined from three different types of measurements: heat capacity (green, C_P/T), conductance (blue, G), and magnetic moment (red, m). The size dependence of blocking temperature (T_B) is also plotted from the same magnetization measurement (black). The gray line is a guide to the eye for the size dependence of T_B.

 

Binary nanoparticle superlattices

Electrostatic assembly of binary nanoparticle superlattices using protein cages.
Mauri A. Kostiainen, Panu Hiekkataipale, Ari Laiho, Vincent Lemieux, Jani Seitsonen, Janne Ruokolainen and Pierpaolo Ceci
Nature Nanotechnology 8, 52 (2013)

a, Native CCMV with RNA genome inside. b, Apoferritin and magnetoferritin (recombinant ferritin cage from Pyrococcus furiosus encapsulating Fe₃O₄–γ-Fe₂O₃). c, Gold nanoparticle stabilized with an amphiphilic ligand featuring a cationic quaternary amine end-group. d, Size of the building blocks drawn to scale.

Singl adatoms with thermal stability

Ordered Array of Single Adatoms with Remarkable Thermal Stability: Au/Fe3O4(001)
Zbynek Novotny, Giacomo Argentero, Zhiming Wang, Michael Schmid, Ulrike Diebold, and Gareth S. Parkinson
Phys. Rev. Lett. 108, 216103 (2012)

Restoration of bulk magnetism in Fe oxide NPs by surfactant molecules

Surfactant Organic Molecules Restore Magnetism in Metal-Oxide Nanoparticle Surfaces.
Juan Salafranca, Jaume Gazquez, Nicolás Pérez, Amílcar Labarta, Sokrates T. Pantelides, Stephen J. Pennycook, Xavier Batlle, and Maria Varela
Nano Lett., 12, 2499 (2012)

Left: Density of states (DOS) projected over the majority spin d orbitals in the octahedral iron sites within different crystal environments. Organic acid bonded to magnetite surface. DOS projected over octahedral iron bonded to the organic acid. Because of the influence of the oxygen ions in the carboxylic group, occupancies are very similar to the bulk case, and the reduction of magnetization at the surface is partially lifted. Middle:  High-resolution Z-contrast STEM images of a Fe3O4 NP showing high crystal quality. Right: Top: L2,3 profile along the direction of the blue arrow in panel d (in red and in black for I+ and I− L23 ratio maps respectively). Bottom: difference between I+ and I− L2,3 ratios along the NP. The scale bar represents 5 nm in all panels. 

 

 

Temperature dependence of Magnetite anisotropy

Magnetocrystalline anisotropy of magnetite.
R Reznıcek, V Chlan, H Stepankova, P Novak and M Marysko
J. Phys. CM 24, 055501 (2012)

Magnetism in 1nm thick magnetite

Magnetism in nanometer-thick magnetite.
Matteo Monti, Benito Santos, Arantzazu Mascaraque, Oscar Rodríguez de la Fuente, Miguel Angel Niño,Tevfik Onur Mentes, Andrea Locatelli, Kevin F. McCarty, José F. Marco, and Juan de la Figuera
Phys. Rev. B 85, 020404(R) (2012)

(a) XAS and (b) XMCD image at705.8 eV. The field of view is 30 μm. (c) XMCD image recorded in remanence showing the magnetization pattern of the same crystal presented in Fig. 2(a). The field of view is 4 μm. The inset shows the experimental geometry. (d) (Top) XAS spectrum from the magnetite crystal. (Bottom) XMCD difference spectrum. The inset shows a typical XMCD spectra from stoichiometric magnetite.

"Trimerons" in Verwey structure of magnetite

Charge order and three-site distortions in the Verwey structure of magnetite.
Mark S. Senn, Jon P. Wright & J. Paul Attfield
Nature 481, 173 (2011)

Charge, orbital and trimeron order in the low-temperature magnetite structure.

Magnetite NPs by decarboxylation

Reduction of iron by decarboxylation in the formation of magnetite nanoparticles.
Nicolás Pérez, Francisco López-Calahorra, Amílcar Labarta and Xavier Batlle
Phys. Chem. Chem. Phys. 13, 19485 (2011)

TEM images of: (a) decomposition of Fe(III) acetylacetonate with decanoic acid in benzylether, NP1; (b) decomposition of Fe(III) decanoate with decanoic acid in benzylether, NP2; (c) conventional decomposition of Fe(III) decanoate, NP3.

Magnetite film crystals

Magnetism in nanometer-thick magnetite.
Matteo Monti, Benito Santos, Arantzazu Mascaraque, Oscar Rodríguez de la Fuente, Miguel Angel Niño,Tevik Onur Mentes¸, Andrea Locatelli, Kevin F. McCarty, José F. Marco, and Juan de la Figuera
Phys. Rev. B 85, 020404(R) (2012)

Selected LEEM images from a sequence acquired during the growth of the magnetite crystals. The first three frames
show the completion of the FeO layer, while the last frame shows the final film with magnetite crystals.

4.6 billion years old magnetite

Magnetite 3D Colloidal Crystals Formed in the Early Solar System 4.6 Billion Years Ago.
Jun Nozawa, Katsuo Tsukamoto, Willem van Enckevort, Tomoki Nakamura, Yuki Kimura, Hitoshi Miura, Hisao Satoh, Ken Nagashima, and Makoto Konoto
JACS 133, 8782 (2011)