Facile and efficient one-pot solvothermal and microwave-assisted synthesis of stable colloidal solutions of MFe2O4 spinel magnetic nanoparticles

Solano, Eduardo; Pérez-Mirabet, Leonardo; Martínez-Julián, Fernando; Guzmán, Roger; Arbiol, Jordi; Puig, T.; Obradors, X.; Yáñez, Ramón; Pomar, A.; Ricart, Susagna; Ros, Josep

doi:10.1007/s11051-012-1034-y

Cited by 78 publications

(80 citation statements)

References 49 publications

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“…50,51 Ros and coworkers noted a similar broadened hysteresis loop for their $7 nm CoFe 2 O 4 NPs, which they attributed to the presence of a strain inhomogeneity from the surface to the core of the NP, leading to the coexistence of so and hard magnetic behavior within a single particle. 43 The T B for these NPs, at $280 K, is also signicantly greater than that of the other ferrite NPs; this is expected for CoFe 2 O 4 NPs. 45,52 The Co 2+ ion -with a d 7 cong-uration -imparts a high magnetocrystalline anisotropy from the presence of spin-orbit coupling.…”

Section: Magnetic Characterizationmentioning

confidence: 75%

“…CuFe 2 O 4 NPs synthesized from Cu(acac) 2 showed prominent impurity peaks showing the presence of copper and iron oxides (not shown), which is documented. 43 The presence of secondary phases was minimized (but not eliminated) by using CuCl 2 -$2H 2 O as a copper source, as recommended by Ros and colleagues. 44 The size distributions are not quite monodisperse, with ratios of the standard deviation over the mean of approx.…”

Section: Synthesismentioning

confidence: 99%

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Synthesis, characterization, and evaluation of PEGylated first-row transition metal ferrite nanoparticles as T₂contrast agents for high-field MRI

et al. 2017

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Poly(ethylene glycol) (PEG)-coated transition metal ferrite (MFe 2 O 4 ; M ¼ Co, Cu, Fe, Mn, Ni, Zn) nanoparticles (NPs) were generated by a one-pot synthetic protocol and found to be small, fairly monodisperse, and superparamagnetic in nature. When evaluated for high-field magnetic resonance imaging, these showed high values of r 2 and r 2 /r 1 at 9.4 T. The well-documented biocompatibility of PEG coatings makes these NPs attractive candidates as T 2 contrast agents for high-field MRI. A systematic comparison of magnetic and relaxivity measurements reveals MnFe 2 O 4 and CoFe 2 O 4 NPs to be superior T 2 MRI contrast agents compared to Fe 3 O 4 NPs.

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Section: Magnetic Characterizationmentioning

confidence: 75%

Section: Synthesismentioning

confidence: 99%

Synthesis, characterization, and evaluation of PEGylated first-row transition metal ferrite nanoparticles as T₂contrast agents for high-field MRI

et al. 2017

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“…However, we focus on thermal and microwave-assisted solvothermal synthesis, using environmentally friendly solvents, e.g. benzyl alcohol, triethylenglycol, isopropanol, ethanol and water [39][40][41][42][43]54]. This is an interesting technique for large scale production compared to the previously published microemulsion approach [35], which shows a more limited capability to adapt to different NP compositions.…”

Section: Nanoparticle Synthesismentioning

confidence: 99%

Epitaxial YBa₂Cu₃O_7−xnanocomposite thin films from colloidal solutions

Cayado

Keukeleere

Garzón

et al. 2015

Supercond. Sci. Technol.

111

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A methodology of general validity to prepare epitaxial nanocomposite films is reported based on the use of colloidal solutions containing different crystalline preformed oxide nanoparticles (ex-situ nanocomposites). The trifluoroacetate (TFA) metal-organic chemical solution deposition route is used with alcoholic solvents to grow epitaxial YBa 2 Cu 3 O 7 (YBCO) films. For that reason stabilizing oxide nanoparticles in polar solvents is a challenging goal. We have used scalable nanoparticle synthetic methodologies such as thermal and microwave-assisted solvothermal techniques to prepare CeO 2 and ZrO 2 nanoparticles. We show that stable and homogeneous colloidal solutions with these nanoparticles can be reached using benzyl alcohol, triethyleneglycol, nonanoic acid, trifluoroacetic acid or decanoic acid as protecting ligands, thereby allowing subsequent mixing with alcoholic TFA solutions. An elaborate YBCO film growth analysis on these nanocomposites allows the identification of the different relevant growth phenomena, e.g. nanoparticle pushing towards the film surface, nanoparticle reactivity, coarsening and nanoparticle accumulation at the substrate interface. Upon mitigation of these effects, YBCO nanocomposite films with high self-field critical currents (J c 3-4 MA/cm 2 at 77 K) were reached, indicating no current limitation effects associated to epitaxy perturbation, while smoothed magnetic field dependences of the critical currents at high magnetic fields and decreased effective anisotropic pinning behavior confirms the effectiveness of the novel developed approach to enhance vortex pinning. In conclusion, a novel low cost solution-derived route to high current nanocomposite superconducting films and coated conductors has been developed with very promising features.

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“…A large magnetic coercivity (Hc) was reported for self-assembled Fe3-xCoxO4 NC arrays [8], which enhances the magnetic coupling between adjacent NCs, and prevents enlargement of θ with increasing temperature. To date, there are some reports on magnetism of Fe3-xCoxO4 NCs [8,9]. There have been no studies of MR for Fe3-xCoxO4 NCs, as we know.…”

Section: Introductionmentioning

confidence: 99%

Magnetoresistance at Room Temperature of Oleic Acid Coated Fe3-xCoxO4 (x = 0, 0.1 and 0.3) Nanocrystal Drop-Cast Films

Nara

Namimatsu

Mitome

et al. 2015

Trans. Mat. Res. Soc. Japan

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Oleic acid coated Fe3-xCoxO4 (x = 0, 0.1 and 0.3) nanocrystal self-assembled films were fabricated via drop-casting of colloidal particles on a SiO2/Si substrate. Nanocrystals of the Fe3-xCoxO4 exhibited bifurcation of the zero-field-cooled and field-cooled magnetizations at 300 K. The Fe3-xCoxO4 nanocrystal drop-cast films demonstrated nonlinear current-voltage characteristics between the source and drain electrodes in magnetic fields of zero and 0.2 T, and magnetoresistance reached into −46% for the x = 0 film and −50% for both the x = 0.1 and 0.3 films at 300 K. Oleic acid coated Fe3-xCoxO4 (x = 0.1 and 0.3) nanocrystal would boost developments of a high performance current switching device using negative magnetoresistance.

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Facile and efficient one-pot solvothermal and microwave-assisted synthesis of stable colloidal solutions of MFe2O4 spinel magnetic nanoparticles

Cited by 78 publications

References 49 publications

Synthesis, characterization, and evaluation of PEGylated first-row transition metal ferrite nanoparticles as T₂contrast agents for high-field MRI

Synthesis, characterization, and evaluation of PEGylated first-row transition metal ferrite nanoparticles as T₂contrast agents for high-field MRI

Epitaxial YBa₂Cu₃O_7−xnanocomposite thin films from colloidal solutions

Magnetoresistance at Room Temperature of Oleic Acid Coated Fe<sub>3-<i>x</i></sub>Co<sub><i>x</i></sub>O<sub>4</sub> (<i>x</i> = 0, 0.1 and 0.3) Nanocrystal Drop-Cast Films

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Facile and efficient one-pot solvothermal and microwave-assisted synthesis of stable colloidal solutions of MFe2O4 spinel magnetic nanoparticles

Cited by 78 publications

References 49 publications

Synthesis, characterization, and evaluation of PEGylated first-row transition metal ferrite nanoparticles as T2contrast agents for high-field MRI

Synthesis, characterization, and evaluation of PEGylated first-row transition metal ferrite nanoparticles as T2contrast agents for high-field MRI

Epitaxial YBa2Cu3O7−xnanocomposite thin films from colloidal solutions

Magnetoresistance at Room Temperature of Oleic Acid Coated Fe<sub>3-<i>x</i></sub>Co<sub><i>x</i></sub>O<sub>4</sub> (<i>x</i> = 0, 0.1 and 0.3) Nanocrystal Drop-Cast Films

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Synthesis, characterization, and evaluation of PEGylated first-row transition metal ferrite nanoparticles as T₂contrast agents for high-field MRI

Synthesis, characterization, and evaluation of PEGylated first-row transition metal ferrite nanoparticles as T₂contrast agents for high-field MRI

Epitaxial YBa₂Cu₃O_7−xnanocomposite thin films from colloidal solutions