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Structure and Properties of Soft-Magnetic Amorphous Bilayer Ribbons

100%

Švec P., Mat'ko I., Marcin J., Kováč J., Vlasák G., Janičkovič D., Škorvánek I., Švec P.

issue 5

832-834

Rapidly quenched bilayers consisting of Fe-Si-B and Co-Si-B layers have been prepared by planar flow casting from a single crucible with two nozzles. Temperature dependences of electrical resistivity, dilatation and magnetization have been investigated in the amorphous state and during crystallization of both layers. Preliminary studies of the structure of the layers and of the interlayer have been performed by X-ray diffraction, cross-sectional electron microscopy and microanalysis. From the results it seems evident that the process of connection of the two layers during preparation takes place by solidification with only a small extent of mutual interdiffusion of component atoms localized to a narrow well-defined interface, leading to mechanically solid connection between the two layers. The effect of combined presence of two different soft magnetic alloys on the overall magnetic properties is discussed with respect to potential applications of such materials.

Network Properties of Ureasil-Based Polymer Matrixes for Construction of Amperometric Biosensors as Probed by PALS and Swelling Experiments

81%

Kavetskyy T., Šauša O., Čechová K., Švajdlenková H., Mat'ko I., Petkova T., Boev V., Ilcheva V., Smutok O., Kukhazh Y., Gonchar M.

Acta Physica Polonica A

2017

vol. 132

issue 5

1515-1518

Network properties of ureasil-based polymer matrixes suitable for construction of amperometric biosensors were probed by positron annihilation lifetime spectroscopy and swelling experiments. Temperature dependences of the ortho-positronium (o-Ps) lifetimes and their relative intensities were measured in a temperature range of 15-350 K. Glass transition temperatures and expansion coefficients of microscopical free-volume for the investigated polymers were determined. Differences in network behavior for the aged samples and the effect of chalcogenide (As₂S₃) particles on the free volume of ureasil network were observed. Swelling experiments using ethyl alcohol showed that the structure of the aged sample network had less swelling ability for the pure ureasil as well as composite. This suggests that the one of factors influencing swelling is the change of the basic ureasil network due to ageing. It is supposed that the network properties obtained by positron annihilation lifetime spectroscopy and swelling experiments could be very helpful to understand better the bio-functionality of the constructed biosensor based on the ureasil-chalcogenide glass composite.

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2 Acta Physica Polonica A

1 2017

1 2010

2 Mat'ko I.

1 Boev V.

1 Gonchar M.

1 Ilcheva V.

1 Janičkovič D.

1 Kavetskyy T.

1 Kováč J.

1 Kukhazh Y.

1 Marcin J.

1 Petkova T.

1 Smutok O.

1 Vlasák G.

1 Čechová K.

1 Šauša O.

1 Škorvánek I.

1 Švajdlenková H.

1 Švec P.

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Structure and Properties of Soft-Magnetic Amorphous Bilayer Ribbons

Network Properties of Ureasil-Based Polymer Matrixes for Construction of Amperometric Biosensors as Probed by PALS and Swelling Experiments