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1
Content available Mobility of interacting inorganic nanoparticles
Dziedzic-Kocurek K., Fornal P., Stanek J.
Nukleonika
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2015
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Vol. 60, No. 1
19--22
EN
The mobility of the 110 nm-Fe2O3 particles in a viscous sucrose solution depends on the concentration of the nanoparticles. When the average particle–particle nearest neighbor distance is less than 250 nm, the particle interaction slows down their mobility. When is more than 170 nm, the small mobility of nanoparticles does not depend on their concentration. The critical distance is approximately equal to 2Rh = 260 nm, where Rh is the hydrodynamic radius, determined by the dynamic light scattering (DLS) method.
2
Content available Mössbauer Spectroscopy in the Studies of Iron Phases From the Slags After Zinc and Lead Production
Jonczy I., Fornal P., Stanek J.
Archives of Foundry Engineering
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2015
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Vol. 15, iss. 3 spec.
21--24
EN
Upper Silesia District is one of the most polluted areas in the country. Rich deposits of metal ores and hard coal have contributed to the extensive development of metallurgy and mine industry which started as early as in the Middle Ages. The ecological hazard can be illustrated by an over 100-year-old waste dump of Zn-Pb ores in one of the Silesian cities – in Ruda Śląska. Despite the long storage period, the wastes, represented mainly by weathered slags as also vitrified waste material, contain of lot of heavy metals in varied their chemical forms. The following metals have been found in wastes: Cd, Pb, Zn, As, Cu, Ti and other, and also a lot of amounts of iron. In the article the results Mössbauer spectroscopy are presented, as a preliminary stage of mineralogical studies of Zn-Pb wastes. Depending on the type of tested waste material different iron phases have been shown: in the weathered slag four different products of the iron oxidation were detected: divalent Fe(OH)2, mixed valence magnetite, Fe3O4 and three valence Fe(OH)3, α Fe2O3 and γ-Fe2O3 compounds, in the vitrified material metallic forms of iron are dominated.
3
Content available Sedimentation of Fe2O3 and metallic iron nanoparticles exhibiting Brownian movement
Fornal P., Stanek J.
Nukleonika
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2013
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Vol. 58, No. 1
39-42
EN
Sedimentation of nanoparticles in water solutions was studied in situ by transmission Mössbauer spectroscopy in horizontal and vertical geometry. The studied specimens were Fe2O3 of a commercial pigment and metallic iron nanoparticles in slurry used in a water purification technology. The sedimentation is selective and leads to the gradual removing of the bigger particles from a solution. The iron nanoparticles in the solution are relatively chemically stable until, due to the drying, the sediment becomes exposed to the air.
4
Content available Simultaneous transmission and scattering Mössbauer measurements of powder samples
Fornal P., Stanek J.
Nukleonika
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2007
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Vol. 52, supl. 1
13-16
EN
A vertical experimental set-up for simultaneous recording transmission and scattering Mössbauer spectra is described. Application of the apparatus for the study of model powder mixture of two components with different grain sizes shows differences in the relative intensity ratio of these fractions in absorption and conversion electron Mössbauer spectroscopy (CEMS) spectra. This effect, explained as a result of the size selectivity of CEMS technique, is parameterized by the grain radius ratio of components. The possible application for investigation of isolated surface nano- and microobjects is discussed.
5
Content available Local electronic and charge state of iron in FeTe2
Stanek J., Fornal P.
Nukleonika
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2004
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Vol. 49,suppl.3
63-65
EN
From 57Fe Mössbauer spectrum of FeTe2 taken in high external magnetic field (B = 4.6 T), the sign of electric field gradient was determined as negative, with an asymmetry parameter of 0.2. A comparison of these data with results of calculation of the electric field gradient within point charge model suggests the lattice character of electric field gradient with some contribution from covalency effects. The effective magnetic field acting on 57Fe is less than the applied, which points out the diamagnetic Fe+2 state of iron. This "electronic state" is in a contradiction to Fe+3 "charge state" concluded from 125Te experiments on 3d transition metal ditellurides as well as from 57Fe quadrupole splitting and isomer shift.
6
Content available Properties of TiN protective coatings on steel
Fornal P., Stanek J., Jaglarz J., Dąbrowski M.
Nukleonika
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2003
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Vol. 48,suppl.1
21-24
EN
The properties of fast cutting steel SW7M, stainless steel 1H18N9T, and tool steel NC11 coated with a TiN protective layer were studied using 57Fe Conversion Electron Mössbauer Spectroscopy. The adhesion of the coatings is determined by the thickness of Fe-N and Fe-Ti interface. The model of the abrasion of the protected tools, based on fast diffusion of Fe ions to the surface though the TiN layer and further oxidation is proposed.
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