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Archaeometallurgical Investigations of the Early Iron Age Casting Workshop at Kamieniec. A Preliminary Study

Garbacz-Klempka A., Kowalski Ł., Kozana J., Gackowski J., Perek-Nowak M., Szczepańska G., Piękoś M.

Archives of Foundry Engineering

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2016

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Vol. 16, iss. 3

29--34

EN

(Chełmno land, Poland) as it is reflected through casting workshop recovered during recent excavations. Among ready products, the ones giving evidence of local metallurgy (e.g. casting moulds and main runners) were also identified. With the shrinkage cavities and dendritic microstructures revealed, the artifacts prove the implementing a casting method by the Lusatian culture metalworkers. The elemental composition indicates application of two main types of bronzes: Cu-Sn and Cu-Pb. Aside these main alloying additions, some natural impurities such as silver, arsenic, antimony and nickel were found which may be attributed to the origin of the ore and casting technology. The collection from Kamieniec was described in terms of its structure and composition. The investigations were made by means of the energy dispersive X-ray fluorescence spectroscopy (ED-XRF), scanning electron microscopy (SEM) coupled with an energy dispersive X-ray analysis system (EDS) and optical microscopy (OM). In order to fingerprint either local or non-local profile of the alloys, the ED-XRF data-set was statistically evaluated using a factor analysis (FA).

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The laboratory comparison of shear bond strength and microscopic assessment of failure modes for a glass-ionomer cement and dentin bonding systems combined with silver nanoparticles

Porenczuk A., Firlej P., Szczepańska G., Kolenda A., Kowalczyk-Olczak D.

Acta of Bioengineering and Biomechanics

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2016

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Vol. 18, no. 2

59--70

EN

Purpose: More than half of the cavity restorations are replaced due to bacterial microleakage. A need for disinfection agents arises. Application of silver nanoparticles (AgNPs) may be beneficial, yet their impact on the adhesives’ shear bond strength to dentin remains unknown. Methods: The aim was to assess the shear bond strength to dentin of different dental materials combined with AgNPs. Failure modes were also examined using SEM/FIB, SEM/EDS and endodontic microscopes. Results: The results showed no impact of AgNPs addition to dental materials in terms of shear bond strength to dentin. A change of the failure mode of the self-etch bonding system, Clearfil SE Bond, combined with AgNPs was observed. The new failure modes depended upon the order of application of the materials onto dentin. Conclusions: The microscopic evaluation of the samples showed the presence of AgNPs agglomerations gathered on the dentin’s surface. AgNPs connection with self-etching dentin bonding system may have a serious clinical impact.

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Design of integrated membrane system with liquid and polymer membranes

Wódzki R., Szczepańska G.

Zeszyty Naukowe. Chemia / Politechnika Śląska

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2001

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z. 146

231-234

PL

Opracowano nowy zintegrowany układ membranowy DD-MHS[FLM-PV] wykorzystujący jednocześnie: proces dializy Donnana (DD), pertrakcji w układzie hybrydowym z przepływową membraną ciekłą (FLM) oraz perwaporacji wody akumulowanej w FLM. Działanie układu zintegrowanego porównano z działaniem jego poszczególnych składowych z osobna. Podstawą porównania były strumienie oraz współczynniki separacji takich kationów, jak: Zn2+, Cu2+, Ca2+, Mg2+, K+ oraz Na+.