نتایج جستجو برای: zr

تعداد نتایج: 9678  

2017
Qixiang Fan Haojun Yu Tie-Gang Wang Zhenghuan Wu Yanmei Liu Filippo Berto

To take advantage of the synergistic effects of Pt and Zr, a kind of Zr-doped, Pt-modified aluminide coating has been prepared by a hybrid process, first electroplating a Pt layer and then co-depositing Zr and Al elements by an above-the-pack process. The microstructure and isothermal oxidation behavior of the coating has been studied, using a Pt-modified aluminide coating as a reference. Resul...

2012
Bradley M. Kraft William W. Brennessel

The title compound, [Zr₃(C₅H₅)₆Cl₂O₂], exists as discrete mol-ecules possessing a series of three Cp(2)Zr units (Cp is cyclo-penta-dien-yl) bridged by oxide ligands and end-capped by chloride ligands. The Cp planes in the central and terminal zirconocene units form dihedral angles of 53.3 (2) and 53.5 (2)°, respectively. The two Zr-O-Zr bridge angles are nearly linear and form a planar Zr₃O₂ co...

2017
Norbert Köpfle Lukas Mayr Daniela Schmidmair Johannes Bernardi Axel Knop-Gericke Michael Hävecker Bernhard Klötzer Simon Penner

The activation and catalytic performance of two representative Zr-containing intermetallic systems, namely Cu-Zr and Pd-Zr, have been comparatively studied operando using methanol steam reforming (MSR) as test reaction. Using an inverse surface science and bulk model catalyst approach, we monitored the transition of the initial metal/intermetallic compound structures into the eventual active an...

Journal: :Chemical communications 2016
Farhan Ahmad Pasha Anissa Bendjeriou-Sedjerari Edy Abou-Hamad Kuo-Wei Huang Jean-Marie Basset

Density functional theory calculations and 2D 1H-13C HETCOR solid state NMR spectroscopy prove that CO2 can be used to probe, by its own reactivity, different types of N-donor surface ligands on SBA15-supported Zr(IV) hydrides: [≡(Si-O-)(≡Si-N=)[Zr]H] and [≡(Si-NH-)(≡Si-X-)[Zr]H2] (X=O or NH). Moreover, [≡(Si–O-)(≡Si-N=)[Zr]H] activates CO2 more efficiently than the other complexes and leads to...

Journal: :Journal of biomedical materials research. Part B, Applied biomaterials 2013
F Y Zhou B L Wang K J Qiu L Li J P Lin H F Li Y F Zheng

In this study, the microstructure, mechanical properties, corrosion behaviors, and in vitro biocompatibility of Zr-Mo alloys as a function of Mo content after solution treatment were systemically investigated to assess their potential use in biomedical application. The experimental results indicated that Zr-1Mo alloy mainly consisted of an acicular structure of α' phase, while ω phase formed in...

2009
W. M. Akram M. Schönbächler H. M. Williams A. N. Halliday

Introduction: Evidence for isotopic anomalies in bulk car-bonaceous chondrites relative to other meteorites, the moon and Earth have recently been reported for several elements (Sm, Nd, Ba, Ti and Cr[1, 2, 3]). The nature of these heterogeneities is not very well understood. The isotopic composition of Zr mainly reflects a mixture of different sand r-process nucleosynthetic components. The s-pr...

Journal: :The journal of physical chemistry. B 2006
Sue-Min Chang Ruey-An Doong

Highly crystalline and surface-modified Zr-doped TiO(2) nanorods were successfully prepared using a nonhydrolytic sol-gel method that involves the condensation of metal halides with alkoxides in anhydrous trioctylphosphine oxide (TOPO) at either 320 or 400 degrees C. In addition, the interaction of the cross-condensation between the Ti and Zr species was studied by characterizing the morphologi...

Journal: :Nuclear medicine and biology 2015
Gregory W Severin Jesper T Jørgensen Stefan Wiehr Anna-Maria Rolle Anders E Hansen Andreas Maurer Mike Hasenberg Bernd Pichler Andreas Kjær Andreas I Jensen

UNLABELLED Preclinical studies involving (89)Zr often report significant bone accumulation, which is associated with dissociation of the radiometal from the tracer. However, experiments determining the uptake of unbound (89)Zr in disease models are not performed as routine controls. The purpose of the present study was to investigate the impact of free or weakly bound (89)Zr on PET quantificati...

2016
Jeff N.Tinianow Darpan N. Pandya Sylvie L. Pailloux Annie Ogasawara Alexander N. Vanderbilt Herman S. Gill Thaddeus J. Wadas Darren Magda Jan Marik

A novel octadentate 3-hydroxypyridin-2-one (2,3-HOPO) based di-macrocyclic ligand was evaluated for chelation of Zr; subsequently, it was used as a bi-functional chelator for preparation of Zr-labeled antibodies. Quantitative chelation of Zr with the octadentate ligand forming ZrL complex was achieved under mild conditions within 15 minutes. The Zr-complex was stable in vitro in presence of DTP...

2016
Anhui Cai Dawei Ding Yong Liu Hong Wu Weike An Guojun Zhou Yun Luo Yongyi Peng

A group of plastic Zr-Al-Ni-Cu bulk metallic glasses (BMGs) with low Zr content was developed and their thermal and mechanical properties were investigated. The results show that these Zr-based BMGs have a single crystallization event for all heating rates in the studied temperature region. The glass transition temperature Tg decreases with increasing Zr content for all heating rates. There are...

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