Mineral dust supplied to remote ocean regions stimulates phytoplankton growth through delivery of micronutrients, notably iron (Fe). Although attention is usually paid to Fe (hydr)oxides as major sources of available Fe, Fe-bearing clay minerals are typically the dominant phase in mineral dust. The mineralogy and chemistry of clay minerals in dust particles, however, are largely unknown. We con...

Nanoscale metal fluorides are promising candidates for high capacity lithium ion batteries, in which a conversion reaction upon exposure to Li ions enables access to the multiple valence states of the metal cation. However, little is known about the molecular mechanisms and the reaction pathways in conversion that relate to the need for nanoscale starting materials. To address this reaction and...

The amendment of the subsurface with nanoscale metallic iron particles (nano-Fe(0)) has been discussed in the literature as an efficient in situ technology for groundwater remediation. However, the introduction of this technology was controversial and its efficiency has never been univocally established. This unsatisfying situation has motivated this communication whose objective was a comprehe...

The release of azo dye contaminants from textile industries into the environment is an issue major concern. Nanoscale zerovalent iron (nZVI) has been extensively studied in degradation pollutants such as methyl orange (MO). In this study, was coupled with copper and silver to make trimetallic Fe/Cu/Ag nanoparticles, order enhance MO increase reactivity catalyst by delaying rate oxidation iron. ...

The mechanical properties of an austenite-based Fe-Mn-Al-C lightweight steel were improved by co-precipitation nanoscale Cu-rich and ?-carbide particles. Fe-28Mn-9Al-0.8C-(0,3)Cu (wt.%) strips near-rapidly solidified annealed in the temperature range from 500 °C to 700 °C. microstructure evolution under different annealing processes studied. Microstructural analysis reveals that ?-carbides part...

This review presents three main categories of macromatrices explored so far for NP encapsulating, including ionic and organic macrocrystals polymeric matrices. The preparation methods the recent progress each category have been discussed.

A room temperature reduction-hydrolysis of Fe(III) precursors such as FeCl₃ or Fe(acac)₃ in various lyotropic liquid crystal phases (lamellar, hexagonal columnar, or micellar) formed by a range of ionic or neutral surfactants in H₂O is shown to be an effective and mild approach for the preparation of iron oxide (IO) nanomaterials with several morphologies (shapes and dimensions), such as extend...

A number of recent studies have shown that iron dissolution in Fe-containing dust aerosol can be linked to source material (mineral or anthropogenic), mineralogy, and iron speciation. All of these factors need to be incorporated into atmospheric chemistry models if these models are to accurately predict the impact of Fe-containing dusts into open ocean waters. In this report, we combine dissolu...

We report quantitative 3D coherent x-ray diffraction imaging of a molten Fe-rich alloy and crystalline olivine sample, synthesized at 6 GPa and 1800 °C, with nanoscale resolution. The 3D mass density map is determined and the 3D distribution of the Fe-rich and Fe-S phases in the olivine-Fe-S sample is observed. Our results indicate that the Fe-rich melt exhibits varied 3D shapes and sizes in th...