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W. Gumowska, I. Dobosz and B. Wrzoszczyk

Abstract

The optimal parameters of the anodic oxidation of aluminium in orthophosphoric acid solution was determined. In the pores of the obtained Al2O3 membranes with the ordered nanometric structure Co-Fe alloys were electrodeposited. The Al2O3 membranes were obtained in the two-stage anodic oxidation of aluminium in the 0.17 M H3PO4 solution in the temperature 1°C and at the electrolysis voltage 180 V. The influence of the anodizing process parameters on the thickness of oxide films and the diameter of pores and the distance between them in the alumina membranes were determined.

The electrodeposition of Co-Fe alloys was carried out from sulphate baths containing sulphates (VI) of copper (II) and cobalt (II) of different composition, in potentiostatic conditions. The optimal electrolysis conditions were determined, where the cathodic deposits of the best quality were obtained. The conditions are: the electrolyte composition: 0.3 M Fe; 0.5 M Co; pH = 3, the potential: -0.760 V (vs. SHE1)).

Open access

I. Dobosz, W. Gumowska and M. Czapkiewicz

Abstract

The nanowires of Co66-Fe34 alloy were obtained in the process of the electrodeposition in the pores of alumina membrane. With the use of the X-ray diffraction analysis the structure of cobalt-iron alloy wires was determined. The wires have the regular Body Centred Cubic structure (BCC). The influence of membrane parameters, an external magnetic field, and the annealing temperature on the magnetic properties of alloy wires was investigated. The obtained nanowires show a high shape anisotropy in the direction perpendicular to the membrane surface of anodic alumina. It was found that the highest influence on the magnetic properties of the wires has their geometry (height, diameter, and the distance between them). The use of an external magnetic field directed perpendicular to the sample surface during the electrodeposition process and additional thermal treatment (annealing) causes a slight increase of the coercive field, remanence, and volume energy density.

Open access

I. Dobosz, E. Rudnik and L. Burzyńska

Codeposition of SiC Particles with Electrolytic Nickel

Ni/SiC composite coatings were produced by electrodeposition from chloride-sulphate bath. The effect of SiC concentration on the percentage of embedded particles at two current densities (0.75 and 1.50 A·dm-2) was determined. SiC content in the nickel matrix was in the range of 13-23 vol%, but lower values were found for higher current density. Increased particles contents in the coatings practically did not change microhardness of deposits (approximately 300 HV), but it increased corrosion resistance. Morphology and particle distribution in the deposits was studied with optical and transmission electron microscopes. Specific surface charge of SiC particles as well as adsorption of Ni2+ions on the powder particles were also determined.

Open access

Izabela Paszkiewicz, Cezary Płatkowski, Łukasz Dobosz and Marek Dobosz

Abstract

Traumatic rupture of the pancreas is a rare and difficult diagnostic and therapeutic problem. The authors present a case of traumatic rupture of the pancreas (grade IV on AAST scale) where concurrent endoscopic and surgical management was used.

Open access

Izabela Paszkiewicz, Ewa Iżycka-Świeszewska, Tomasz Wysocki, Łukasz Dobosz and Marek Dobosz

Abstract

Calcifiyng fibrous pseudotumor (CFPT) is a benign mesenchymal tumor diagnosed in children and young adults, located in the subcutaneous tissue of the trunk and limbs. Its intraabdominal localization is a unique rarity. The Authors of the study presented a case of a 48-year old female patient with an accidentally diagnosed small bowel mesentery tumor during surgery