Metallurgy Research Today is a free monthly online journal that collates and summarizes the latest research about Metallurgy, including details on metals, medical applications, bioengineering.

Efficient white light emission by upconversion in Yb(3+)-, Er(3+)- and Tm(3+)-doped Y(2)BaZnO(5).

Etchart I, Bérard M, Laroche M, Huignard A, Hernández I, Gillin WP, Curry RJ, Cheetham AK

Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge, CB2 3QZ, UK. akc30@cam.ac.uk.

We report efficient white upconversion luminescence in Yb(3+)-, Er(3+)- and Tm(3+)-doped monophasic and biphasic Y(2)BaZnO(5) phosphors under 977 nm near-infrared excitation and at low excitation power densities (down to ∼25 mW mm(-2)).

Published 5 May 2011 in Chem Commun (Camb).
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Articles on Metallurgy published 2 May 2011:

Cell response to collagen-calcium phosphate cement scaffolds investigated for nonviral gene delivery.   J Mater Sci Mater Med, 22(4): 887-97.

Collagen-hydroxyapatite (HA) scaffolds for the non-viral delivery of a plasmid encoding the osteoinductive protein bone morphogenetic protein (BMP)-7 were developed. The collagen-HA was obtained by the combination of calcium phosphate cement in a collagen template. The effect on cell behavior of increasing amounts of HA in the scaffolds was evaluated. Collagen-HA scaffolds containing 13, 23 or 83 wt% HA were prepared. Cell proliferation was reduced in the 83% HA scaffold after 1 day compared ... [Abstract] [Full-text]

Articles on Metallurgy published 29 April 2011:

Sliding of Water Droplets on Hydrophobic Surfaces with Various Hydrophilic Region Sizes.   Langmuir.

Four patterned surfaces with hydrophilic areas of different sizes were prepared using photolithography with a smooth octadecyltrimethoxysilane (ODS) hydrophobic coating. The hydrophilic area in the surfaces was aligned hexagonally with a constant area fraction. The sliding angle and contact angle hysteresis of the water droplets increased concomitantly with increasing pattern size. The increase of the contact line distortion between defects at the receding side plays an important role in this ... [Abstract] [Full-text]

A Base Promoted Cyclization of N-Propargylaminopyridines. Synthesis of Imidazo[1,2-a]pyridine Derivatives.   Org Lett, 13(9): 2286-9.

A base promoted cyclization of the protected N-propargylaminopyridines was shown to be an efficient method for the preparation of imidazo[1,2-a]pyridine derivatives. The reactions were carried out with a small excess of base, at room temperature or slightly above producing the heterocyclic products in moderate to good yields. The stereoelectronic properties of substituents on the pyridine ring were shown to influence the cyclization process. [Abstract] [Full-text]

Articles on Metallurgy published 25 April 2011:

An innovative technique to simply fabricate ZrO(2)-HA-TiO(2) nanostructured layers.   Colloids Surf B Biointerfaces.

For the first time, ZrO(2)-HA-TiO(2) layers were synthesized through EPD-Enhanced MAO (EEMAO) technique in only one step where no supplementary treatment was required. SEM, XRD, EDX, and XPS techniques were employed to propose a correlation between the growth parameters and the physical and chemical properties of the layers. The layers revealed a porous structure where applying higher voltages and/or utilizing higher concentrated electrolytes resulted in formation of wider pores and increasing ... [Abstract] [Full-text]

Articles on Metallurgy published 22 April 2011:

Ancient and historic steel in Japan, India and Europe, a non-invasive comparative study using thermal neutron diffraction.   Anal Bioanal Chem, 400(5): 1493-500.

The production and refinement of steel has followed very different paths in different parts of the Eurasian continent. In aiming to characterize the similarities and differences between various smelting and smithing methods, we have analysed steel samples from four different areas and historic periods: the Kotō Age in Japan (twelfth-sixteenth century), the Moghul Empire in India (seventeenth-nineteenth century), the Ottoman Turkish Empire (seventeenth century) and the late Middle Ages ... [Abstract] [Full-text]

Articles on Metallurgy published 18 April 2011:

Towards enhanced ligand-centred photoluminescence in inorganic-organic frameworks for solid state lighting.   Phys Chem Chem Phys, 13(17): 7622-9.

Three novel inorganic-organic framework compounds containing the organic chromophore ligand 9-fluorenone-2,7-dicarboxylic acid (abbreviated H(2)FDC) and barium (BaFDC), cadmium (CdFDC) and manganese (MnFDC), respectively, have been synthesized and evaluated for their use as phosphor materials for solid state lighting and other applications. The results are compared with two earlier reported structures containing the same ligand with calcium (CaFDC) and strontium (SrFDC). The barium- and ... [Abstract] [Full-text]

Articles on Metallurgy published 12 April 2011:

An FIB-SEM slice-and-view study of three-dimensional beta phase distribution in Ti-6Al-4V.   J Electron Microsc (Tokyo), 60(2): 149-55.

In the scanning electron microscope, weak secondary electron contrast between the alpha and beta phases of a Ti-6Al-4V alloy can be improved via imaging conditions such as beam voltage and current. Dual beam focussed ion beam-scanning electron microscopes are thereby suited for characterising micron and sub-micron microstructural features of Ti-6Al-4V in three dimensions via serial-sectioning procedures. [Abstract] [Full-text]

Articles on Metallurgy published 11 April 2011:

A comparative study of the thermal and dynamic mechanical behaviour of quenched and annealed bioresorbable poly-l-lactide/α-tricalcium phosphate nanocomposites.   Acta Biomater, 7(5): 2176-84.

Despite numerous reports on the degradation properties and biological efficacy of bioresorbable polymer nanocomposites intended for use in orthopaedics, there is currently limited literature addressing their thermal and load-bearing properties, which are of central importance to the successful design of these nanocomposites. Here we demonstrate that the storage moduli at 37°C and the glass transition temperatures of quenched poly-l-lactide/α-tricalcium phosphate nanocomposites were lower than ... [Abstract] [Full-text]

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