Direct observation of cation distributions of ideal inverse spinel CoFeO nanofibres and correlated magnetic properties.

Low-dimensional spinel ferrites have recently attracted increasing attention because their tunable magnetic properties make them attractive candidates as spin-filtering tunnel barriers in spintronic devices and as magnetic components in artificial multiferroic heterostructures. Although we know that the distribution of cations (Fe and Co) in a spinel structure governs its magnetic properties, their distribution in the so-called ideal inverse spinel structure of a ferrite, CoFeO, has not yet been imaged with sub-ångstrom resolution. In this work, we fill this gap in evidence by reporting a direct observation of the distribution of cations in an ideal inverse spinel structure of CoFeO nanofibres using aberration-corrected transmission electron microscopy (TEM).

Bimagnetic h-Co/h-CoO nanotetrapods: preparation, nanoscale characterization, three-dimensional architecture and their magnetic properties.

Well-defined bimagnetic h-Co decorated wurtzite h-CoO nanotetrapods with uniform size have been successfully fabricated by a one-pot thermal decomposition method for the first time, and their three-dimensional architecture, crystal structure, chemical phase and exchange bias effect are characterized at the nanoscale. It is found that individual bimagnetic h-Co/h-CoO nanotetrapods are made of a h-CoO nanotetrapod skeleton to which multiple nanocrystals of ferromagnetic metallic h-Co are directly attached. The chemical analysis shows that the mass ratio of h-CoO and h-Co is 65 : 35.

Nanoscale characterization of 1D Sn-3.5Ag nanosolders and their application into nanowelding at the nanoscale.

One-dimensional Sn-3.5Ag alloy nanosolders have been successfully fabricated by a dc electrodeposition technique into nanoporous templates, and their soldering quality has been demonstrated in nanoscale electrical welding for the first time, which indicates that they can easily form remarkably reliable conductive joints. The electrical measurement shows that individual 1D Sn-3.

A visualized investigation at the atomic scale of the antitumor effect of magnetic nanomedicine on gastric cancer cells.

Aim: Discovering which anticancer drugs attack which organelle(s) of cancer cells is essential and significant, not only for understanding their therapeutic and adverse effects, but also to enable the development of new-generation therapeutics. Here, we show that novel Fe3O4-carboxymethyl cellulose-5-fluorouracil (Fe3O4-CMC-5FU) nanomedicine can apparently enhance the antitumor effect on gastric cancer cells, and its mechanism of killing the SGC-7901 gastric cancer cells can be directly observed at the atomic scale.

Materials & Methods: The novel nanomedicine was prepared using the traditional antitumor drug 5FU to chemically bond onto the functionalized Fe3O4 nanoparticles (Fe3O4-CMC-5FU nanomedicine), and then was fed into SGC-7901 gastric cancer cells.

Wire-in-tube structure fabricated by single capillary electrospinning via nanoscale Kirkendall effect: the case of nickel-zinc ferrite.

Wire-in-tube structures have previously been prepared using an electrospinning method by means of tuning hydrolysis/alcoholysis of a precursor solution. Nickel-zinc ferrite (Ni0.5Zn0.