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Micro-Raman Spectroscopy of Natural and Synthetic Ferritins and Their Mimetics

100%
Szybowicz M., Koralewski M., Karoń J., Melnikova L.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
534-536
EN
Micro-Raman spectroscopy was used to studies of naturally occurring biogenic ferritin, synthetic ferritin with magnetic core (magnetoferritin) as well as their several mimetics. We demonstrate the ability of micro-Raman spectroscopy to discriminate between ferritin and magnetoferritin used in the studies. The results are promising for further use of the Raman spectroscopy as potential tool to distinguish between the forms of iron present in biogenic materials and biological tissues.
2
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Electrochemical Impedance Spectroscopy Studies of HF CVD Diamond Films

88%
Kowalska M., Fabisiak K., Wrzyszczyński A., Szybowicz M., Paprocki K.
Acta Physica Polonica A
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2015
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vol. 128
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issue 3
447-451
EN
Diamond films were synthesized by a hot filament vapor deposition method using H₂/CH₄ gas mixtures. A Hioki impedance analyzer was used to study the dielectric properties of the deposited diamond films. The dielectric dispersion measurement yielded the real and imaginary parts of impedance of diamond films in the form of a Nyquist plot in a complex plane. The obtained results were fitted by using equivalent circuit which consists of three impedance (Z) components containing resistor R and capacitor C or constant phase element connected in parallel. The structure and quality of diamond films were analyzed by scanning electron microscopy and the Raman spectroscopy. The impedance measurements showed that concentration of non-diamond admixture has essential influence on electrochemical properties of diamond layers.
3
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Comparative Study of Orientational Order of Some Liquid Crystals from Various Homologous Series

76%
Bielejewska N., Chrzumnicka E., Mykowska E., Przybylski R., Szybowicz M., Władysiak K., Bauman D.
Acta Physica Polonica A
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2006
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vol. 110
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issue 6
777-793
EN
The long-range orientational order of liquid crystals from homologous series of 4-n-alkyl-4'-cyanobiphenyl, 4-n-alkoxy-4'-cyanobiphenyl, trans-4-n-alkyl(4'-cyano-phenyl)-hexane, and 4-(trans-4'-n -alkylcyclohexyl)-isothiocyanato-benzene was studied by means of classical methods of optical spectroscopy: absorption of the polarized light, fluorescence depolarization, and Raman scattering depolarization. The absorption, emission, and Raman scattering spectra of linearly polarized light were recorded as a function of temperature in the whole range of the mesophase. On the basis of these spectra the order parameters ⟨P_2⟩ and ⟨P_4⟩ as well as the orientational distribution function were determined. The results obtained for members of various series with the same number of carbon atom in the alkyl chain were compared. It was found that the orientational order of liquid crystal molecules depends on the structure of the rigid core, on the kind of the terminal group as well as on the alkyl chain length. The odd-even effect for the order parameters, explained as the alteration of interaction between alkyl chains, was observed.
4
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Structural and Electrical Characterization of Undoped Diamond Layer Grown by HF CVD

76%
Banaszak-Piechowska A., Paprocki K., Fabisiak K., Dudkowiak A., Szybowicz M., Staryga E.
Acta Physica Polonica A
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2017
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vol. 132
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issue 4
1411-1414
EN
The undoped diamond layers were prepared using hot filament chemical vapor deposition technique. The controlled variation of the deposition parameters resulted in the layers with varying amount of nondiamond impurities. Routine characterization of the layers was carried out using scanning electron microscopy, X-ray diffractometry, and the Raman spectroscopy. Detailed measurements of room temperature electrical conductivity (σ₃₀₀), current-voltage characteristics have yielded useful information about the electrical conduction mechanism in this interesting material. The σ₃₀₀ and I-V characteristic measurements were done in sandwiched configuration taking care off the surface effects. The diamond shows room temperature dc conductivity reaching the values in the range of σ₃₀₀ ≈0.1-1 μS/cm. The I-V characteristics in these layers show space charge limited conduction behavior with I ~ V² in high voltage region. The obtained results are explained in terms of chemically adsorbed hydrogen on the surface of diamond layers, which is a source of acceptor states just above the top of valence band.
5
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Raman Scattering in Zn_{1-x}Mg_{x}Se Mixed Crystals

64%
Kozielski M., Szybowicz M., Firszt F., Łęgowski S., Męczyńska H., Sekulska B., Szatkowski J., Paszkowicz W.
Acta Physica Polonica A
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1996
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vol. 90
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issue 5
1040-1044
EN
This paper presents results of investigations of the Raman scattering of vibrational modes in Zn_{1-x}Mg_{x}Se crystals for the range of composition 0 < x < 0.43. The Raman polarized spectra of Zn_{1-x}Mg_{x}Se were measured at room temperature. The typical Raman spectrum shows four peaks which can be interpreted as longitudinal and transverse optical ZnSe-like and MgSe-like phonons. The ZnSe-like and MgSe-like vibrations can be described by the modified random element isodisplacement model. Results of the Raman measurements in the investigated range of composition confirm the two-mode behaviour of the optical phonons in the mixed Zn_{1-x}Mg_{x} Se crystals.
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