Mechanistic Investigations of the Synthesis of Size-Tunable Ni Nanoparticles by Reduction of Simple Ni Diamide Precursors.

Herein, we present a detailed study of the conversion of a nickel(II) diamide precursor to size-tunable, monodisperse nickel nanoparticles (NPs). The thermal decomposition of nickel(II) dioleylamide, synthesized either independently or in situ, resulted in the formation of Ni NPs without the coproduction of water. Mechanistic studies were conducted on the stability and reduction pathway of the Ni precursor, and on the consequent particle formation.

The role of water in the synthesis of indium nanoparticles.

We report the water-assisted synthesis of indium nanoparticles (In NPs). We found that a precise amount of water was necessary to allow the formation of the desired 7 nm In NPs: the oxidation of the In surface by water inhibits the growth of NPs as well as subsequent reactivity with white phosphorus (P). A novel surface activation method based on the use of organosilanes is presented.

Key Non-Metal Ingredients for Cu-catalyzed "Click" Reactions in Glycerol: Nanoparticles as Efficient Forwarders.

The effect of long-alkyl-chain amines in CuI-assisted azide-alkyne cycloadditions of terminal alkynes with organic azides in glycerol and other environmentally benign solvents (water, ethanol) has been examined. The presence of these additives favors the in situ formation of Cu -based nanoparticles and results in an increase of the catalytic reactivity. In glycerol, liquid-phase transmission electron microscopy (TEM) analyses, enabled by the negligible vapor pressure of this solvent, proved that Cu nanoparticles are responsible for the observed catalytic activity.

CT Features of Vertebral Venous Congestion Simulating Sclerotic Metastases in Nine Patients With Thrombosis of the Superior Vena Cava.

Objective: The purpose of this retrospective study is to describe the CT features of vertebral venous congestion simulating sclerotic metastases in nine patients with thrombosis of the superior vena cava.

Materials And Methods: We analyzed all cases of obstruction of the superior vena cava recorded in our radiologic teaching files since 2006, to identify cases with vertebral venous congestion simulating sclerotic metastases. The following CT features were analyzed: the underlying cause, exact level, and length of the venous obstruction; the pattern of collateral venous pathways visualized as enlarged and densely opacified vascular channels; and the characteristics of the vertebral venous congestion.

Unexpected bond activations promoted by palladium nanoparticles.

Thioether-phosphines, 1 and 2, were applied for the stabilisation of palladium nanoparticles (PdNPs) synthesised by a bottom-up methodology, using [Pd2(dba)3] as an organometallic precursor. For the phenyl containing ligand 1, small (d(mean) = 1.6 nm), well-defined and dispersed nanoparticles were obtained; however, ligand 2 involving a long alkyl chain led to agglomerates.