Discrete, dispersible MnAs nanocrystals from solution methods: phase control on the nanoscale and magnetic consequences.

Nanocrystals of thermodynamically stable alpha-MnAs (hexagonal NiAs-type) and metastable beta-MnAs (orthorhombic MnP-type) have been synthesized by the reaction of triphenylarsine oxide (Ph(3)AsO) and dimanganesedecacarbonyl (Mn(2)CO(10)) at temperatures ranging from 250 to 330 degrees C in the presence of the coordinating solvent trioctylphosphine oxide (TOPO). Morphologically, both alpha- and beta-MnAs nanoparticles adopt a core-shell type structure with a crystalline core and low-contrast noncrystalline shell. In contrast to prior studies on MnAs particles, disks, and films, the present bottom-up synthesis yields discrete, dispersible MnAs nanoparticles without a structural support.

Superparamagnetic nanoparticle-polystyrene bead conjugates as pathogen capture mimics: a parametric study of factors affecting capture efficiency and specificity.

There is currently significant interest in the miniaturization of disease detection platforms. As detection platforms decrease in size there is a need for the development of sample preparation protocols by which cells or biomarkers of interest can be concentrated from large volumes down to volumes more amenable to analysis within microfluidic devices. To address this issue, we present a series of magnetic confinement assays for polystyrene (PS) beads mediated through their covalent modification with a series of superparamagnetic nanoparticles, where the PS beads have many properties similar to bacteria, but are not pathogenic.

Liberation of pnicogen chains from Cu(2)P(1.8)As(1.2)I(2): synthesis and characterization of a new allotrope of P--As.

Removal of CuI from Cu(2)P(1.8)As(1.2)I(2) results in a novel P--As allotrope.