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Wyświetlanie 1-15 z 26
Tytuł:
Fluorescence Microscopy of Corrole-Single Silver Nanowire Hybrid Nanostructures
Autorzy:
Czechowski, N.
Olejnik, M.
Nowak-Król, A.
Piątkowski, D.
Heiss, W.
Gryko, D.
Mackowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/1419537.pdf
Data publikacji:
2012-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.50.-j
78.67.Uh
73.20.Mf
81.07.Pr
81.07.-b
Opis:
We report on confocal microscopy imaging of hybrid nanostructures composed of silver nanowires and corroles. Both nanomaterials were separated by a 30 nm thick $SiO_2$ spacer in order to inhibit fluorescence quenching. The results show that for such a hybrid nanostructure the average enhancement of the fluorescence intensity reached 2.5. Importantly, the coupling to plasmon excitations in metallic nanowires leaves no effect on the fluorescence spectrum of the organic molecules.
Źródło:
Acta Physica Polonica A; 2012, 122, 2; 333-336
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of the Thermoluminescence of CVD Diamond
Autorzy:
Karczmarska, A.
Mitura-Nowak, M.
Nowak, T.
Marszałek, M.
Powiązania:
https://bibliotekanauki.pl/articles/1490194.pdf
Data publikacji:
2012-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.10.Bk
81.05.ug
78.60.Kn
Opis:
This work reports some thermoluminescent properties of chemical vapour deposition diamond film grown by 5 kW microwave assisted plasma chemical vapour deposition. The 2" diamond sample with the thickness of 32 μm was exposed to gamma radiation in the dose range 0.6-55 Gy. The thermoluminescent glow curve of diamond sample displayed a peak with the maximum centered at 240°C. The linearity of the detector response in the range of 10-55 Gy was observed. The bleaching effect, seen as fading of the thermoluminescent signal when the device was exposed to light in the visible range, was also noticed. Two-dimensional dose distribution was measured using 2D thermoluminescent reader equipped with a sensitive 640 × 480 pixels charge coupled device camera. The surface morphology of the diamond film was observed with scanning electron microscope and atomic force microscope. The grain size was estimated as about 15 μm. The Raman spectroscopy was used to characterize phase purity. The width and position of the diamond Raman band around 1332 $cm^{-1}$ indicated that the coating is crystalline and of good quality. It is concluded that good quality chemical vapour deposition diamond coating could be promising material for thermoluminescent dosimetry.
Źródło:
Acta Physica Polonica A; 2012, 121, 2; 510-513
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Electronic and Electrochemical Properties of the $LaNi_5$-Based Alloys
Autorzy:
Szajek, A.
Jezierski, A.
Nowak, M.
Jurczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/1810498.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
81.20.Ev
Opis:
Mechanical alloying was used to synthesize $LaNi_5$-type hydrogen storage materials. X-ray diffraction analysis showed that, after 30 h milling, the starting mixture of the elements was decomposed into an amorphous phase. Following the annealing in high purity argon at 700°C for 0.5 h, X-ray diffraction confirmed the formation of the $CaCu_5$-type structures. The nanocrystalline materials were used as negative electrodes for a $Ni-MH_x$ battery. A partial substitution o Ni by Al or Mn in $LaNi_{5-x}M_x$ alloy leads to an increase in discharge capacity. On the other hand, the alloying elements such as Al, Mn and Co greatly improved the cycle life of $LaNi_5$ material. For example, in the nanocrystalline $LaNi_{3.75}Mn_{0.75}Al_{0.25}Co_{0.25}$ powder, discharge capacities of up to 258 mA h $g^{-1}$ (at 40 mA $g^{-1}$ discharge current) were measured. The band structure ab initio calculations showed that 3g sites are preferred by Al, Co, and Mn atoms in the unit cell.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 247-250
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanoscale deformation of GaAs affected by silicon doping
Autorzy:
Majtyka, A.
Nowak, R.
Chrobak, D.
Powiązania:
https://bibliotekanauki.pl/articles/1112264.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.kg
61.72.J-
Opis:
Effect of silicon doping on the elastic-plastic transition of GaAs crystal is demonstrated by results of nanoindentations and ab initio simulations. The performed experiments show that an increase of silicon concentration causes a decrease of the contact pressure at the onset of permanent nanodeformation of GaAs crystal. Ab initio calculations demonstrate that presence of Si atoms in the crystal lattice suppresses the shear modulus as well as the pressure of equilibrium between zinc-blende and rock-salt phases of GaAs. Furthermore, it is argued that the effect of dislocations pinning to Si dopants is essential for clarification of GaAs yielding.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1127-1130
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Temperature in Semi-Insulating GaAs for Low Electric Fields
Autorzy:
Zduniak, A.
Łusakowski, J.
Nowak, G.
Powiązania:
https://bibliotekanauki.pl/articles/1923732.pdf
Data publikacji:
1992-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Ht
Opis:
Heating of electrons by electric fields smaller than that required for generation of domain oscillations was investigated in samples of EL2-rich semi-insulating GaAs. Current-voltage characteristics were measured as a function of temperature between 268 K and 330 K. They exhibit a sublinear shape which is interpreted as a result of an enhanced electron capture on the EL2. The capture rate and the electron temperature as a function of the electric field was determined. A fitting procedure gave the value of electron capture cross-section on the EL2 to be 2.7 × 10$\text{}^{-13}$ cm$\text{}^{2}$ which agrees with literature data.
Źródło:
Acta Physica Polonica A; 1992, 82, 5; 777-780
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the Magnetostrictive Properties of the Selected Construction Steel
Autorzy:
Juś, A.
Nowak, P.
Gińko, O.
Powiązania:
https://bibliotekanauki.pl/articles/1032160.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.80.+q
75.50.Bb
85.70.Ec
07.55.Ge
46.25.Hf
Opis:
The paper presents results of research on the effects of mechanical stresses on the magnetostrictive properties of 13CrMo4-5 steel. Measurements of stress dependence of magnetostriction fill the gap in the state of the art enabling description of relationships between stresses applied to the samples and its magnetoelastic and magnetostrictive properties. Performed studies represent the starting point for development of unified model of both Villari (magnetoelastic) and Joule (magnetostrictive) effects under stresses in steels. The formulated model will be the basis for the development of generalized methods of interpreting the results of non-destructive testing of the state of the internal stresses in steels based on these phenomena.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1084-1086
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parallel Mappings as a Key for Understanding the Bioinorganic Materials
Autorzy:
Kuczumow, A.
Nowak, J.
Chałas, R.
Powiązania:
https://bibliotekanauki.pl/articles/1808388.pdf
Data publikacji:
2009-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.En
87.64.Bx
87.64.Dz
87.59.-e
82.80.-d
Opis:
Important bioinorganic objects, both living and fossilized are as a rule characterized by a complex microscopic structure. For biological samples, the cell-like and laminar as well as growth ring structures are among most significant. Moreover, these objects belong to a now widely studied category of biominerals with composite, inorganic-organic structure. Such materials are composed of a limited number of inorganic compounds and several natural organic polymers. This apparently simple composition leads to an abnormal variety of constructions significant from the medical (repairs and implants), natural (ecological effectiveness) and material science (biomimetic synthesis) point of view. The analysis of an image obtained in an optical microscope, optionally in a scanning electron microscope is a topographical reference for further investigations. For the characterization of the distribution of chemical elements and compounds in a material, techniques such as X-ray, electron- or proton microprobes are applied. Essentially, elemental mappings are collected in this stage. The need for the application of an X-ray diffraction microprobe is obvious and our experience indicates on the necessity of using the synchrotron-based devices due to their better spatial resolution and good X-ray intensity. To examine the presence of the organic compounds, the Raman microprobe measurements are good options. They deliver information about the spatial distribution of functional groups and oscillating fragments of molecules. For the comprehensive investigation of bioinorganic material structural and chemical features, we propose the following sequence of methods: optical imaging, elemental mapping, crystallographic mapping, organic mapping and micromechanical mapping. The examples of such an approach are given for: petrified wood, human teeth, and an ammonite shell.
Źródło:
Acta Physica Polonica A; 2009, 115, 2; 482-488
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydroquinone Synthesis of Silver Nanoparticles from Silver Bromide Suspensions
Autorzy:
Król-Gracz, A.
Nowak, P.
Michalak, E.
Dyonizy, A.
Powiązania:
https://bibliotekanauki.pl/articles/1491287.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.-Bc
61.46.Hk
Opis:
The results of research into the preparation of silver nanoparticles using photoreduction in the presence of hydroquinone as the reductant were discussed. Substrates for the synthesis of silver nanoparticles were ultrafine crystalline gelatine-stabilised aqueous suspensions of silver bromide. The influence of the reductant to substrate molar ratio and the medium's pH to the efficient production of silver nanoparticles were studied. The properties of resultant silver particles were examined using UV-Vis spectroscopy. Transmission electron microscopy was used for the photomicrography of silver nanoparticles suspensions.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 196-199
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of Silver Halide Nanosols
Autorzy:
Michalak, E.
Nowak, P.
Król-Gracz, A.
Dyonizy, A.
Powiązania:
https://bibliotekanauki.pl/articles/1491302.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.-b
Opis:
The aim of this work was to establish the average size of silver halide nanosols. The method applied was based on the optical turbidance measurements in real time of crystallization process. Dilute turbid suspensions of silver bromide, chloride and iodide stabilized by excess of halide ions and gelatin were measured over wavelength range from 450 nm to 600 nm. Experimental results were compared with the scattering theory of Rayleigh. Relation between dosing rate of reactants to dispersion system and size of obtained silver halide crystals was investigated. Interest in crystalline gelatine-stabilised aqueous suspensions of silver halide is due to their application as a substrate for the synthesis of silver nanoparticles.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 200-202
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utilization of Eddy Current Tomography in Automotive Industry
Autorzy:
Nowak, P.
Nowicki, M.
Juś, A.
Szewczyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/1032668.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.80.Jm
87.10.Kn
Opis:
Paper presents utilized innovative setup for eddy current tomography and possibility of its utilization in automotive industry. Described tomography setup is designed for testing axisymmetric objects thus motor valve was selected for exemplary testing. Tests were conducted on motor valve in original state. Afterwards reference defect was created on element and measurements were repeated. Significant difference between tests results were observed, thus potential for utilization in automotive industry was confirmed. Finite element method simulations were applied in order to confirm the measurement results. Calculations were conducted in open-source finite element method software, which solves Maxwell equations in the A-V form. Modelling results confirm possibility of finite element method-based inverse tomography transformation.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1168-1170
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical Properties of SbSI/Sb_2S_3 Single and Double Heterostructures
Autorzy:
Toroń, B.
Nowak, M.
Grabowski, A.
Kępińska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1399098.pdf
Data publikacji:
2013-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.78.Fk
79.60.Jv
73.40.-c
78.66.-w
Opis:
The $SbSI//Sb_2S_3$ single heterostructures as well as $Sb_2S_3//SbSI//Sb_2S_3$ and $SbSI//Sb_2S_3/SbSI$ double heterostructures have been produced by applying $CO_2$ laser treatment of p-type SbSI single crystals. The current-voltage and transient characteristics of these heterostructures have been measured in temperatures below and above the SbSI single crystal Curie temperature $(T_{c} = 293 K)$. The results have been fitted with appropriate theoretical formulae to determine the following types of the investigated heterojunctions: P-p $SbSI//Sb_2S_3$, p-P-p $Sb_2S_3//SbSI//Sb_2S_3$ and P-p-P $SbSI//Sb_2S_3//SbSI$. Influence of the illumination on electrical properties of $SbSI//Sb_2S_3$ single and double heterostructures has been reported. Fabricated new structures may be potentially applicable in electronics and optoelectronics as a new type of metal-ferroelectric-semiconductor devices.
Źródło:
Acta Physica Polonica A; 2013, 124, 5; 830-832
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric Properties of SbSI in the Temperature Range of 292-475 K
Autorzy:
Starczewska, A.
Solecka, B.
Nowak, M.
Szperlich, P.
Powiązania:
https://bibliotekanauki.pl/articles/1376063.pdf
Data publikacji:
2014-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.Bg
78.40.Fy
Opis:
Methodology of impedance measurements and ferroelectric hysteresis loops observed in temperature range 292-475 K for antimony sulfoiodide (SbSI) grown from vapour phase are discussed. Temperature dependences of spontaneous polarization and coercive field of SbSI crystals are presented.
Źródło:
Acta Physica Polonica A; 2014, 126, 5; 1125-1127
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluorescence of Sodium Vapour Excited by 330 nm Laser Pulses
Autorzy:
Gorbunov, N. A.
Kozłowski, P.
Nowak, K.
Stacewicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/2025779.pdf
Data publikacji:
2001-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.Wr
34.80.Dp
46.65.+g
Opis:
We report results of investigation on the fluorescence induced in sodium vapour by pulses of laser light tuned near the 3S → 4P transition (330 nm). The fluorescence was observed in perpendicular and parallel directions in respect to the laser beam. A depletion of fluorescence intensity corresponding to the 5D → 3P transition (498 nm) was observed along the laser beam. We explain this effect as a result of reabsorption that is caused by intense population of the 3P level due to cascade stimulated processes. The most intense depletion occurs about 20 ns after the laser pulse and it corresponds to the moment of maximal population of the 3P level.
Źródło:
Acta Physica Polonica A; 2001, 99, 5; 531-537
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Mild Rehydration on Freeze-Dried Dipalmitoylphosphatidylcholine (DPPC) Multilamellar Membranes as Observed by Proton NMR and Sorption Isotherm
Autorzy:
Harańczyk, H.
Leja, A.
Nowak, P.
Baran, E.
Strzałka, K.
Powiązania:
https://bibliotekanauki.pl/articles/1398809.pdf
Data publikacji:
2016-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.56.Na
87.16.D-
Opis:
Between neighbouring bilayers of lyophilized dipalmitoylphosphatidylcholine (DPPC) multilamellar vesicles the total number of water molecules equals 9 H₂O molecules/1 DPPC molecule. One of these molecules is very tightly bound to the lipid molecule, seven are in immobilized (tightly bound) water fraction whereas the last one belongs to mobile water fraction. The rehydration from the gaseous phase of the DPPC model membranes was investigated using hydration kinetics, sorption isotherm, and high power proton relaxometry. The obtained data for DPPC were compared with these obtained for wheat photosynthetic membranes. Rehydrated photosynthetic membranes differ from DPPC model membranes in hydration kinetics. The average hydration time has a similar value: (22.0 ± 2.8) h (photosynthetic membrane) and (19.8 ± 1.6) h (DPPC), however hydration kinetics was described by one-exponential function for photosynthetic membrane, while for model membrane it shows fine double exponential form. The sigmoidal form of sorption isotherm is better fitted using Dent model than by the Brunauer-Emmett-Teller formula. The Brunauer-Emmett-Teller/Dent deviation parameter b =0.93 either for photosynthetic or for model membranes. The mass of water saturating primary water binding sites equals ΔM/m₀= 0.017 (wheat photosynthetic membranes) and 0.027 (DPPC). The detected by NMR-isotherm study mass of water "sealed" in model membrane structures was about ΔMₛ/m₀=0.182 (about 7-8 H₂O molecules/1 DPPC molecule), and ΔMₛ/m₀= 0.066 for photosynthetic membrane.
Źródło:
Acta Physica Polonica A; 2016, 129, 2; 179-184
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elastic-plastic transition in MBE-grown GaSb semiconducting crystal examined by nanoindentation
Autorzy:
Majtyka, A.
Trębala, M.
Tukiainen, A.
Chrobak, D.
Borgieł, W.
Räisänen, J.
Nowak, R.
Powiązania:
https://bibliotekanauki.pl/articles/1075863.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Jj
62.20.F-
81.15.Hi
81.05.Ea
Opis:
The present paper concerns the elastic-plastic nanodeformation of Te-doped GaSb crystals grown by molecular beam epitaxy on the n-type of GaSb substrate. The conventional analysis of nanoindentation data obtained with sharp triangular (Berkovich) and spherical tip revealed the elastic modulus (E=83.07± 1.78 GPa), hardness (H=5.19±0.25 GPa) and "true hardness" (H_{T}=5.73±0.04 GPa). The registered pop-in event which indicates the elastic-plastic transition in GaSb crystal points towards the corresponding yield strength (σ_{Y}=3.8±0.1 GPa). The origin of incipient plasticity in GaSb crystal is discussed in terms of elastic-plastic deformation energy concept.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1131-1133
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 26

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