High-performance Mn-rich P2-phase Na2/3Mn0.8Fe0.1Ti0.1O2 is synthesized by a ceramic method, and its stable electrochemical performance demonstrated. 23Na solid-state NMR confirms the substitution of Ti4+ ions in transition metal oxide layer very fast Na+ mobility interlayer space. The pristine electrode delivers second charge/discharge capacity 146.57/144.16 mA·h·g–1 retains 95.09% discharge at 50th cycle within voltage range 4.0–2.0 V C/10. At 1C, reversible specific still reaches 99.40...

We report a direct observation of the intrinsic magnetization behavior Au in thiol-capped gold nanoparticles with permanent magnetism at room temperature. Two element specific techniques have been used for this purpose: X-ray magnetic circular dichroism on L edges and 197Au Mössbauer spectroscopy. Besides, we show that silver copper synthesized by same chemical procedure also present room-temperature magnetism. The observed temperature Ag Cu dodecanethiol-capped proves physical mechanisms...

Among iron oxide phases, magnetite (Fe3O4) is often the preferred one for nanotechnological and biomedical applications because of its high saturation magnetization low toxicity. Although there are several synthetic routes that attempt to reach nanoparticles (NPs), they usually referred as "IONPs" (iron NPs) due great difficulty in obtaining monophasic stoichiometric Fe3O4 phase. Added this problem common increase size/shape polydispersity when larger NPs (D > 20 nm) synthesized. An...

1D assemblies of magnetic nanoparticles are great potential for designing novel nanostructured materials with enhanced collective properties. In that challenging context, a new assembly strategy is presented to prepare chains well‐defined in structure and spatial arrangement. The iron oxide onto substrate controlled using “click” chemistry under an external field. Co‐aligned single nanoparticle separated by regular distances can be obtained this strategy. intrinsic high uniaxial anisotropy...

Most studies on magnetic nanoparticle-based hyperthermia utilize iron oxide nanoparticles smaller than 20 nm, which are intended to have superparamagnetic behavior (SP-MNPs). However, the heating power of larger with non-fluctuating or fixed dipoles (F-MNPs) can be significantly greater that SP-MNPs if high enough fields (H > 15 mT) used. But synthesis single nanocrystals magnetite (Fe3O4) a regular shape and narrow size distribution devoid secondary phases remains challenge. Iron...

Local heat generation from magnetic nanoparticles (MNPs) exposed to alternating fields can revolutionize cancer treatment. However, the application of MNPs as anticancer agents is limited by serious drawbacks. Foremost among these are fast uptake and biodegradation cells unpredictable behavior when they accumulate within or around tissues. In fact, several studies have reported that heating power severely reduced in cellular environment, probably due a combination increased viscosity strong...

Achieving high battery performance from low-cost, easily synthesisable electrode materials is crucial for advancing energy storage technologies. Metal organic frameworks (MOFs) combining inexpensive transition metals and ligands are promising candidates high-capacity cathodes. Iron-chloranilate-water herein reported to be produced in aqueous media under mild conditions. Removal of reticular water known [Fe2(CAN)3(H2O)4]·4H2O yields a new supramolecular metal-organic framework (SMOF),...

Achieving high battery performance from low‐cost, easily synthesisable electrode materials is crucial for advancing energy storage technologies. Metal organic frameworks (MOFs) combining inexpensive transition metals and ligands are promising candidates high‐capacity cathodes. Iron‐chloranilate‐water herein reported to be produced in aqueous media under mild conditions. Removal of reticular water known [Fe2(CAN)3(H2O)4]·4H2O yields a new supramolecular metal‐organic framework (SMOF),...

Dodecanethiol capped Ag nanoparticles (NPs) have been independently synthesized by the well-known Brust method under same physical-chemical conditions. The obtained NP present similar sizes (∼2 nm) but different magnetic behaviors. extended x-ray absorption fine structure analyses at K-edge of did not reveal any noticeable structural nor topological differences among samples. In clear contrast with provided for thiol ferromagnetic Au NPs, analysis also brings out existence Ag–S bonds in a...

The currently existing magnetic hyperthermia treatments usually need to employ very large doses of nanoparticles (MNPs) and/or excessively high excitation conditions (H × f > 1010 A/m s) reach the therapeutic temperature range that triggers cancer cell death. To make this anticancer therapy truly minimally invasive, it is crucial development improved chemical routes give rise monodisperse MNPs with saturation magnetization and negligible dipolar interactions. Herein, we present an innovative...

Both $\mathrm{Cu}$ and $\mathrm{Fe}$ metals, with face-centered cubic (fcc) crystal structures, are nonmagnetic. However, the substitution of atoms by Fe in fcc-$\mathrm{Cu}$ lattice leads to formation a random solid solution appearance ferromagnetic order, value magnetic moment per atom fcc environment even above $2{\ensuremath{\mu}}_{B}$. This striking behavior is closely related magnetovolume effects (Invar), which we have detected means thermal expansion magnetization measurements...

The origin of magnetism in atomically disordered transition-metal--nonmagnetic (i.e., FeAl) alloys has been investigated by dichroism and diffraction measurements at high pressure band structure calculations. results show that, contrast to earlier studies, besides the effects local environment magnetic ions, disorder-induced lattice changes play a key role properties these systems. We demonstrate experimentally theoretically that about 35--45% moment ${\mathrm{Fe}}_{60}{\mathrm{Al}}_{40}$...

We show that bulk gold (Au) exhibits temperature-independent paramagnetism in an external magnetic field by x-ray circular dichroism spectroscopy at the Au L(2) and L(3) edges. Using sum-rule analysis, we obtained a moment of 1.3 × 10(-4) μB/atom 10 T paramagnetic susceptibility 8.9 10(-6) for 5d orbit. The induced is characterized large (≈ 30%) orbital contribution. This component was retained even when atoms formed nanoparticles, playing important role stabilizing spontaneous spin...

An approach to the design of a suitable system for technological applications, such as magneto-rheological fluids with controllable performance, showing high saturation magnetization and low coercivity remanence, is presented. This based on synthesis stable iron nanoparticles relatively thick polymeric coating—the non-ionic surfactant nonylphenol polyethoxylate—by microemulsion method NaBH4 reducing agent. X-ray diffractometry, Mössbauer spectroscopy, resolution electron microscopy reveal...

Magnetic nanoparticles have been largely proposed as means of technological tools due to its value in different fields, especially biomedicine. Herein, we present a robust, highly reproducible and low-cost method obtain superparamagnetic magnetite (MNP-II) about <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mn>15</mml:mn><mml:mo>±</mml:mo><mml:mn>5</mml:mn><mml:mtext> </mml:mtext><mml:mtext>nm</mml:mtext></mml:math> diameter by thermal decomposition [Fe(acac) 3 ]...

Magnetic measurements, x-ray diffraction, and M\"ossbauer spectroscopy have been used to study the structural magnetic changes produced by annealing ${\mathrm{Fe}}_{87}{\mathrm{Zr}}_{6}{\mathrm{B}}_{6}\mathrm{Cu}$ amorphous alloys during nanocrystallization process. Thermal causes a devitrification of phase giving rise Fe crystallites in an remaining matrix. The shows enhancement Curie temperature ${(T}_{c})$ large hyperfine-field distribution $[{P(B}_{\mathrm{hf}})]$ presence crystallites....

Calorimetric and magnetic measurements, x-ray powder diffraction Mössbauer spectroscopy have been used to study the structural changes occurring after each of two steps crystallization that take place in FeNbCuSiB-type alloys. Two samples with different boron silicon concentrations, (x=6, 9), studied. They give a somewhat composition crystalline phases appearing processes. The most noticeable phenomenon is observed increase about 50 K Curie temperature FeSi phase between end first process...

The effects of magnetic-field annealing on the soft magnetic properties nanocrystalline (Fe1−xCox)90Zr7B3 (x=0, 0.1, 0.2, and 0.3) have been investigated. annealing-induced uniaxial anisotropy (Ku) in these alloys was found to follow an x2 dependence Ku appears reflect population density Co–Co atomic pairs. is suppressed by applying a rotating field during coercivity reduced up 60%. Nanocrystalline (Fe0.8Co0.2)90Zr7B3 annealed under 640kA∕m exhibits low 9.1A∕m high permeability values (under...

The magnetic domains of nanocrystalline Fe84Nb6B10 annealed under static and rotating fields have been investigated by means magneto-optical Kerr effect (MOKE) microscopy in order to clarify the origin dramatic softening brought about field annealing. coercivity (Hc) values after static- rotating-magnetic annealings are 5.9 3.0A∕m, respectively. MOKE image annealing implies a highly coherent uniaxial anisotropy (Ku) sample whereas no sign such strong Ku is evident domain configuration Our...