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Zinc Metal (zinc + metal)

Distribution by Scientific Domains

Chemistry	50%
Polymers and Materials Science	33%

Selected Abstracts

Synthesis of Allylic Sulfides via Cleavage of S,S Bonds Promoted by Zinc Metal in DMF.

CHEMINFORM, Issue 38 2005
Jingxing Du
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Zinc Metal Promoted Selective ,-Haloacylation and gem-Bisacylation of Alkyl Aldehydes in the Presence of Chlorotrimethylsilane.

CHEMINFORM, Issue 31 2004
Yoshio Ishino
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Synthesis and Structure,Property Correlation in Shape-Controlled ZnO Nanoparticles Prepared by Chemical Vapor Synthesis and their Application in Dye-Sensitized Solar Cells

ADVANCED FUNCTIONAL MATERIALS, Issue 6 2009
Revathi R. Bacsa
Abstract Here, the large scale synthesis of nanocrystalline ZnO spheres and tetrapods in the size range of 8,40,nm by chemical vapor synthesis using zinc metal as precursor is described. A detailed study of the effect of experimental parameters on the morphology and yield is presented. High-resolution transmission electron microscopy images of the tetrapods show that they are formed by the self assembly of four nanorods in the vapor phase. The tetrapods have optical absorption coefficients that are one order of magnitude greater than the spheres and show intense UV luminescence whereas the spheres show only the green emission. The observed differences in the optical properties are related to the presence of surface defects present in the nanospheres. The tetrapods have increased efficiencies for application in dye sensitized solar cells when compared to spheres. [source]

Synthesis and Characterization of Block Copolymers of , -Caprolactone and DL -Lactide Initiated by Ethylene Glycol or Poly(ethylene glycol)

MACROMOLECULAR CHEMISTRY AND PHYSICS, Issue 16 2003
Ming-Hsi Huang
Abstract Biodegradable copolymers were prepared by ring-opening polymerization of sequentially added , -caprolactone and DL -lactide in the presence of ethylene glycol or poly(ethylene glycol), using zinc metal as catalyst. Polymerization was performed in bulk and yielded block copolymers with predetermined PEG/PCL/PLA segments. The obtained polymers were characterized by 1H NMR, SEC, IR, DSC, TGA, and X-ray diffraction. Data showed that the copolymers preserved the excellent thermal behavior inherent to PCL. The crystallinity of PLA-containing copolymers was reduced with respect to PCL homopolymer. The presence of both hydrophilic PEG and fast degrading PLA blocks should improve the biocompatibility and biodegradability of the materials, which are of interest for applications as substrate in drug delivery or as scaffolding in tissue engineering. Block copolymerization of , -caprolactone and DL -lactide initiated by dihydroxyl PEG. [source]

Synthesis and Properties of (Triptycenedicarboxylatio)zinc Coordination Networks

CHEMISTRY - A EUROPEAN JOURNAL, Issue 23 2009
Sergei
Abstract Paddle wheels and pillars: Layered 3D metal,organic frameworks comprised of paddle-wheel coordination units are constructed under a variety of conditions to incorporate bridging ligands (as illustrated) that impart desired properties, such as guest-exchange behavior, luminescence, microporosity, and stability, to the material. (Triptycenedicarboxylato)zinc metal,organic frameworks (MOFs) based on paddle wheel secondary building units (SBUs) with different axial ligands have been prepared. The reproducible formation of the layered paddle-wheel structures from triptycenedicarboxylic acid (H2TDC) and zinc nitrate under various conditions seems to be characteristic of this acid and is utilized for the construction of 3D frameworks by a pillaring approach. We attempted to bring additional functionalities into MOFs by employing the appropriate pillaring ligands, for example, bis(4-pyridyl)- s -tetrazine and bis(4-pyridyl)-dimethoxy- p -phenylenedivinylene, and investigated certain properties of some MOF materials, such as guest-exchange behavior, luminescence, microporosity, and stability. [source]

Geneses of High Chlorine and Silver,Lead,Zinc,Mineralized Granitoids in Tsushima, Japan

RESOURCE GEOLOGY, Issue 3 2000
Shunso ISHIHARA
7037. (5) They are high in Cl and S, which occur in fluid inclusions and as pyrrhotite>pyrite, respectively. Two genetic models are considered for the source of the unique granitoid magmas: the continental crust or the upper mantle fertilized with Si, K and 18O. The latter may be the case for the Tsushima granitoids, because of the low initial Sr ratio. The age of the granitoids (16 Ma) indicates the magmatism related to the opening of the Sea of Japan. It is suggested that both basaltic and granitic magmas were generated in the continental lithosphere under an extensional tectonic setting; the two magmas could have been partly mingled. The mingled magma was originally an oxidized type, but reduced during the emplacement by repeated inflow of S and C-bearing gases from the pelitic wall rocks. Because of the reduction, SO3 sulfur is almost nil in the rock-forming apatite, and most of sulfur remained in fluid phase of the magma as reduced species. Cl content was high in the original magma and concentrated in the fluid phase of the residual system which dissolved silver, lead and zinc metals. Such a fluid migrated into the Taishu fracture systems, as the magma crystallized, and formed the silver,lead,zinc deposits. [source]