We report on the reactivity of grafted tantalum organometallic catalysts with molecular oxygen. The changes in the local Ta electronic structure were followed by in situ high-energy resolution off-resonant spectroscopy (HEROS). The results revealed agglomeration and formation of Ta dimers, which cannot be reversed. The process occurs independently of starting grafted complex.

In the present report, generation of Tantalum oxyfluoride and oxynitride upon ammonolysis gel obtained from modified tantalum-alkoxo complexes is reported. To best our knowledge, this first report formation tantalum thin films via β-diketone complex [Ta(OEt)4(CF3COCH2COCH3)]m. The integration nitrogen fluorine in lattice sites metal oxides leads to significant reduction bandgap, resulting their...

The major advantage of Polymer Tantalum capacitors over other types tantalum is their low equivalent series resistance (ESR), providing a higher capacitance stability with frequency and ripple current capability. When were introduced to the market in mid 1990s, they voltage, leaky, unreliable, which limited applications commercial electronics. Today, some polymer demonstrate highest working low...

The slow activity of cathode materials is one of the most significant barriers to realizing the operation of solid oxide fuel cells below 500 °C. Here we report a niobium and tantalum co-substituted perovskite SrCo0.8Nb0.1Ta0.1O3-δ as a cathode, which exhibits high electroactivity. This cathode has an area-specific polarization resistance as low as ∼0.16 and ∼0.68 Ω cm2 in a symmetrical cell an...

Our aim was to determine whether tantalum m arkers improved the accuracy and/or precision of methods for the measurement of migration in total hip replacement based on conventional measurements without mathematical correction of the data, and with Ein Bild Roentgen Analyse - Femoral Component Analysis (EBRA-FCA) which allows a computerised correction. Three observers independently analysed 13 s...

The cyclometallated tantalum(v) hydride complex {ArNC(Me)CHC(Me)N[2-(CHMeCH2)-6-(i)Pr-C6H3]}Ta(N(t)Bu)H (2) was prepared from hydrogenolysis of (BDI)TaN(t)BuMe2 (BDI = N,N'-diaryl-β-diketiminate, aryl = 2,6-(i)Pr2-C6H3). Based on mechanistic studies, formation of 2 likely proceeds through a dihydride intermediate generated from successive σ-bond metathesis steps. Compound 2 was found to undergo...

To determine the reliability of geometric (edge-detection) quantitative coronary angiographic analysis (QCA) of restenosis within a new Cordis tantalum stent, QCA and intracoronary ultrasound (ICUS) measurements were compared in both an experimental restenosis model and in the clinical follow-up of patients. In the experimental series, Plexiglas phantom vessels with concentric stenosis channels...

This study evaluated the outcomes of using porous tantalum rods for the treatment of osteonecrosis of the femoral head (ONFH). We performed core decompression and inserted porous tantalum implants in 149 patients (168 consecutive hips) with ONFH. Hips had large (65), medium (64), or small (39) lesions; 63 lesions were lateral, 68 were central, and 35 were medial. Conversion to total hip arthrop...

We have studied the characteristics of bone ingrowth of a new porous tantalum biomaterial in a simple transcortical canine model using cylindrical implants 5 x 10 mm in size. The material was 75% to 80% porous by volume and had a repeating arrangement of slender interconnecting struts which formed a regular array of dodecahedron-shaped pores. We performed histological studies on two types of ma...