Zincian georgeite, an amorphous copper–zinc hydroxycarbonate, has been prepared by co-precipitation using acetate salts and ammonium carbonate. Incorporation of zinc into the georgeite phase and mild ageing conditions inhibits crystallisation into zincian malachite or aurichalcite. This zincian georgeite precursor was used to prepare a Cu/ZnO catalyst, which exhibits a superior performance to a...

Zincian georgeite, an amorphous copper-zinc hydroxycarbonate, has been prepared by co-precipitation using acetate salts and ammonium carbonate. Incorporation of zinc into the georgeite phase and mild ageing conditions inhibits crystallisation into zincian malachite or aurichalcite. This zincian georgeite precursor was used to prepare a Cu/ZnO catalyst, which exhibits a superior performance to a...

BACKGROUND Methanol to dimethyl ether (MTD) is considered one of the main routes for the production of clean bio-fuel. The effect of copper loading on the catalytic performance of different phases of alumina that formed by calcination at two different temperatures was examined for the dehydration of methanol to dimethyl ether (DME). RESULTS A range of Cu loadings of (1, 2, 4, 6, 10 and 15% Cu...

The giant magnetoresistance GMR of multilayered Co/Cu nanowires potentiostatically electrodeposited inside the pores of an anodized alumina template was studied in the current perpendicular to the plane CPP geometry. The maximum magnetoresistance change of 13.5% was observed for Co 8 nm /Cu 10 nm nanowires at room temperature. The interfacial roughness and/ or an intermixing between Co and Cu l...

Abstract In this study, copper matrix composites were prepared using the cold and hot pressing technique then investigated to select suitable one for self-lubricating applications. A hybrid of alumina molybdenum disulfide with a 1:1 ratio by mechanical milling 40 h was proceeded peel cover particles their layers. Three different samples like Cu, Cu/10 Al 2 O 3 , Cu/hybrid 20(Al –MoS ) mixed 15 ...

The electric, electronic, mechanical and thermal characteristics of high density electronic devices can be affected by the physico-chemical characteristics of base materials as well as by trace impurities. It is well known that soft errors caused by trace -emitting impurities are one cause of the faulty operation of electronic devices. This phenomenon was initially reported in May[1] in the 197...

The role of catalyst support and regioselectivity molecular adsorption on a metal oxide surface is investigated for the NO reduction Cu/{\gamma}-alumina heterogeneous catalyst. For solid surface, computational models {\gamma}-alumina are constructed based Step-by-Step Hydrogen Termination (SSHT) approach. Dangling bonds, which appear by cutting crystal structure model, terminated stepwise with ...

A novel scheme is presented for the synthesis of graded materials by electrodeposition in porous insulating templates. Lateral control of copper electrodeposition in nanoporous alumina membranes is achieved by application of a lateral potential gradient on a thin Au film evaporated on the membrane, used as the cathode. Formation of metal gradients in the membranes is shown to occur under condit...

Cu2O nanowires, mainly consisting of (100) and (200) polycrystalline structures with a length of 4 mum are prepared by electrochemical deposition using a porous alumina template. It is found that the optimized electrochemical conditions to prepare Cu2O nanowires are different from those for the formation of a bulk thin Cu2O layer since different pH values are found between the tip of the pores ...

It has recently been reported that in the Y203-stabilized tetragonal zirconia phase (TZP) system the addition of a small amount of transition-metal oxides (e.g. CuO, MnO and ZnO) which form a liquid or amorphous grain boundary phase significantly enhances superplasticity [1, 2]. In CuO-added 2Y-TZP abrupt changes have been found in the stress exponent and activation energy across the melting te...