This paper deals with an experimental investigation on the friction stir welding of pure copper. 4 mm thick copper plates have been welded in the butt joint configuration using a conical unthreaded tool, with and without preheating. An electrically heated backing plate has been employed to increase the initial temperature of the plates and to investigate the influence of pre-heating on the weld...

A microcolorimetric procedure for measurement of long-chain fatty acids in pure solution was adapted to eliminate phospholipid interference and used to determine free fatty acids (FFA) in human plasma and serum. The lipids were extracted from plasma into chloroform; the phospholipids precipitated with acetone and MgCl2 in water bath; and the FFA concentration in the supernatant determined by fo...

A novel approach for direct electroless (EL) patterning of copper films without catalysts has been developed. In a special electroless solution employed in the present study, the formation of copper particles was observed and the negatively charged surfaces were confirmed by zeta potential measurements. The conditions of the solution (ionic strength, pH, temperature, additives etc.) greatly aff...

Anchovy oil is a very suitable supplementary ingredient for fish feeds due to the essential fatty acid composition. The acute toxicity of zinc and copper ions for rainbow trout (Oncorhynchus mykiss Walbaum 1792) were evaluated by static bioassays. The average weight and lenght of fish used in the zinc experiments were 3,02 ±0.21 g and 6.52 ±0.12 cm, respectively, while the tests with copper ion...

A limited amount of information exists regarding the relationship between the chemical form of copper and the formation of chlorinated aromatics in fly ash. To understand the effects of the various forms of copper on the formation of chlorinated aromatics in real fly ash, we determined the chemical forms of copper present in various types of real fly ash using X-ray absorption near edge structu...

We report a method for producing thin, completely continuous and highly conductive copper films conformally inside very narrow holes with aspect ratios over 35:1 by atomic layer deposition ALD . Pure copper thin films were grown from a novel copper I amidinate precursor, copper I N,N -di-sec-butylacetamidinate, and molecular hydrogen gas as the reducing agent. This copper precursor is a liquid ...

3D printing using thermoplastics has become very popular in recent years, however, it is challenging to provide a metal coating on 3D objects without using specialized and expensive tools. Herein, a novel acrylic paint containing malachite for coating on 3D printed objects is introduced, which can be transformed to copper via one-step laser treatment. The malachite containing pigment can be use...

Two gold-selective adsorbents were prepared from MCM-41 by grafting amino and thiol groups. The mesoporous silica adsorbents possess higher adsorption capacity for gold compared to activated carbons. The OMSNH2 adsorbent was able to selectively remove and adsorb gold from solutions containing copper. Pure gold was recovered by a simple acid wash and the regenerated adsorbents could be reused. T...

Using a transient calorimetric technique, the total hemispherical emissivities Eh of very pure copper, aluminum, and silver have been measured at various temperatures in the range 335-1100'K. By carrying out measurements on a sphere, a thin circular disk, and a thin square plate all made of the same copper sample, it is shown that the measured (, is practically independent of the shape of the s...

The paper 1 contains results of investigation of the structure and some properties of copper and molybdenum based composite materials and the processing parameters in their production via electron-beam evaporation/condensation. The present work has been done in connection with the necessity of improvement and repeatability of the properties of condensed molybdenum-copper materials, which partic...