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    Wyświetlanie 1-10 z 10
    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:
    Electrochemical Deposition of Nanowires in Porous Alumina
    Autorzy:
    Kalska-Szostko, B.
    Brancewicz, E.
    Mazalski, P.
    Sveklo, J.
    Olszewski, W.
    Szymański, K.
    Sidor, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1809497.pdf
    Data publikacji:
    2009-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.45.-h
    62.23.Hj
    82.45.Qr
    81.07.-b
    75.75.+a
    Opis:
    Electrochemical deposition is a very efficient method for producing many types of modern materials. The method is not expensive and does not have a limit for sample size. In our work the preparation of Ni, Co and Fe nanowires is presented. The obtained nanowires had different diameter and length which were tunable by template porous material and time of deposition, respectively. The quality of the prepared wires was dependent also on deposition mode. The smallest wires of the diameter around 40 nm were prepared in porous anodic alumina oxide obtained from oxalic acid. The largest ones, around 120 nm, were produced in phosphoric acid. The length could be as large as the thickness of the oxide and reached up to about 1 μm. The morphology of wires was studied by atomic force microscopy and scanning electron microscopy. The magnetic characterization was done with usage of magnetic force microscopy and the Mössbauer spectroscopy. The wires show magnetization along their growth direction.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 2; 542-544
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sb Layers on p-GaN: UPS, XPS and LEED Study
    Autorzy:
    Grodzicki, M.
    Mazur, P.
    Pers, J.
    Zuber, S.
    Ciszewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1376064.pdf
    Data publikacji:
    2014-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Dz
    68.37.Ps
    68.37.Ef
    68.37.-d
    81.10.Bk
    81.07.-b
    Opis:
    The electronic structure of p-type GaN(0001) surfaces and its modification by antimony adsorption, and properties of Sb/GaN(0001) interface, are presented in this report. The studies were carried out in situ by ultraviolet photoelectron spectroscopy, X-ray photoelectron spectroscopy, and low-energy electron diffraction. Thin Sb layers were deposited under ultrahigh vacuum conditions onto the substrate at room temperature. Electron affinity of clean p-GaN surface amounted to 3.0 eV. A small amount of Sb on GaN(0001) surface reduced the electron affinity to 1.9 eV. The work function of the Sb layer was equal to 4.4 eV. For the Schottky barrier height of the Sb/GaN interface, the value of 2.50 eV was obtained.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 5; 1128-1130
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Type I CdSe and CdMgSe Quantum Wells
    Autorzy:
    Rudniewski, R.
    Rousset, J.
    Janik, E.
    Kossacki, P.
    Golnik, A.
    Nawrocki, M.
    Pacuski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1376087.pdf
    Data publikacji:
    2014-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.20.-e
    81.05.Dz
    81.07.-b
    Opis:
    In this work we present the band gap engineering, epitaxial growth and optical characterization of CdSe/$Cd_{0.9}Mg_{0.1}Se$ and $Cd_{0.9}Mg_{0.1}Se$/$Cd_{0.85}Mg_{0.15}Se$ quantum wells with a thickness ranging from 1 to 15 nm. These structures exhibit strong near-band-gap photoluminescence from helium up to room temperature. The emission energy is tuned in the range from 1.74 to 2.1 eV at 7 K, depending on the thickness and well composition. The most intense photoluminescence (both at 7 and 300 K) was observed for 10 nm thick CdSe/$Cd_{0.9}Mg_{0.1}Se$ wells. Such a structure gives also a sharp emission line (FWHM = 20 meV) at low temperature. The presented quantum wells are well suited for being embedded in lattice matched ZnTe based microcavities.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 5; 1167-1170
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of $Fe_4[Fe(CN)_6]_3$·$14H_2O$ Nanopowder by Co-Precipitation Technique and Effect of Heat Treatment
    Autorzy:
    Rohilla, S.
    Lal, B.
    Sunder, S.
    Aghamkar, P.
    Kumar, S.
    Aggarwal, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535871.pdf
    Data publikacji:
    2010-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.-b
    64.70.Nd
    61.82.Rx
    Opis:
    Nanopowder of iron cyanide hydrate (member of Prussian blue family) was obtained using ferric chloride and potassium cyanide in their dilute solution through co-precipitation method. The effect of thermal annealing on iron cyanide hydrate nanocrystallites have been studied in detail. The formation of $Fe_4[Fe(CN)_6]_3$·$14H_2O$ and iron oxides was revealed by the Fourier transform infrared spectroscopy. The crystal structure, morphology and size of nanocrystallites were investigated by X-ray diffraction and transmission electron microscope. Results suggest that using co-precipitation technique, nanopowder of iron cyanide hydrate, in typically spherical shape, can be obtained and their thermal treatment also yield iron oxide nanocrystallites of spherical with good homogeneity. The size of the prepared nanocrystallites was found in the range 20-36 nm. It was observed that thermal treatment, typically at 800°C (4 h), iron cyanide hydrate ($Fe_4[Fe(CN)_6]_3$·$14H_2O$) nanocrystallites transformed into iron oxide ($α-Fe_2O_{3,}$ hematite) nanocrystallites.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 4; 696-700
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physico-Chemical and Biological Properties of Arsenic Sulfide ($As_{55}S_{45}$) Nanosuspension Prepared by Milling
    Autorzy:
    Bujňáková, Z.
    Shpotyuk, O.
    Sedlák, J.
    Pastorek, M.
    Turianicová, E.
    Baláž, P.
    Ingram, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1375164.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Wk
    81.05.Kf
    81.07.-b
    Opis:
    Nanosuspension based on melt-quenched arsenic sulfide of nominal $As_{55}S_{45}$ composition was prepared by nanomilling and tested as potential anticancer drug. Polyvinylpyrrolidone was used as steric stabilizer and inhibitor of agglomeration. Individual nanoparticles had average size of 192 nm (determined by photon cross-correlation spectroscopy) and had several times better dissolution ability in comparison with bulk $As_{55}S_{45}$. Effect of nanomilling is shown to be associated with formation of arsenic sulfide crystalline nanoparticles and free-volume entities located at the interface between nanoparticles and surrounding matrix as it follows from positron annihilation measurements. Cytotoxicity tests were performed using human melanoma cell line Bowes and confirmed high toxicity of the studied nanosuspension.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4; 902-906
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic hardening induced in RCo₅ (R = Y, Gd, Sm) by short HEBM
    Autorzy:
    Łopadczak, P.
    Bajorek, A.
    Prusik, K.
    Zubko, M.
    Chełkowska, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1048324.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.-b
    81.07.Bc
    75.50.Ww
    75.60.-d
    75.75.Cd
    Opis:
    The paper is focused on the magnetic and structural properties of RCo₅ (R = Y, Gd, Sm) intermetallics fabricated by high energy ball - milling (HEBM). The investigated samples were first produced by arc-melting as bulk materials and then were milled for 1h in dimethylformamide with balls to powder ratio 10:1. The influence of the HEBM parameters on the microstructure was investigated by a variety of complementary measurement methods. The Rietveld refinement was performed to estimate the dependence of crystallite size and microstrain on type of sample. The hysteresis loops were recorded by SQUID magnetometer at 2 K and 300 K and at magnetic field up to μ₀H=7 T. The impact of short HEBM process is visible as the enhancement of coercivity and simultaneous reduction of the saturation magnetization.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 688-690
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    AFM/STM Modification of Thin Sb Films on 6H-SiC(0001)
    Autorzy:
    Mazur, P.
    Zuber, S.
    Grodzicki, M.
    Ciszewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1195467.pdf
    Data publikacji:
    2014-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Dz
    68.37.Ps
    68.37.Ef
    68.37.-d
    81.10.Bk
    81.07.-b
    Opis:
    Atomic force microscopy and scanning tunneling microscopy have been used for nanometer scale modifications of Sb films deposited on 6H-SiC(0001) surface. The films are grown in situ by vapor deposition under ultrahigh vacuum. The growth follows the Volmer-Weber mode. Ultrathin (up to 3 nm on average) Sb films which consist of no coalesced islands can be modified by moving the island over the substrate surface by the AFM tip. Thicker films, which are firmer due to the coalescence, can be modified by the field and/or current produced by STM tip. Final result of the modifications is adsorbate free 6H-SiC(0001) surface restitution over the modified area.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 5; 1131-1133
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    TEM Study of the Structural Properties of Nanowires Based on Cd, Zn, Te grown by MBE on Silicon Substrates
    Autorzy:
    Kaleta, A.
    Kret, S.
    Sanchez, A.
    Bilska, M.
    Kurowska, B.
    Szczepańska, A.
    Płachta, J.
    Wojnar, P.
    Wojciechowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032910.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Dz
    81.07.-b
    61.46.-w
    62.23.Hj
    81.07.Gf
    61.46.Km
    78.67.Uh
    07.10.Pz
    68.35.Gy
    68.37.Lp
    68.37.Og
    68.37.Ma
    Opis:
    In this work we report on the atomic structures, elemental distribution, defects and dislocations of three types of semiconductor nanowires: ZnTe, CdTe, and complex ZnTe/(Cd,Zn)Te core/shell hetero-nanowires grown by a molecular beam epitaxy on (111) Si substrate using a vapor-liquid-solid mechanism. The structural properties and the chemical gradients were measured by transmission electron microscopy methods. The nanowires reveal mainly sphalerite structure, however wurtzite nanowires were also observed.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1399-1405
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Magnetosomes After Exposure to the Effect of the Sonication and Ultracentrifugation
    Autorzy:
    Molčan, M.
    Hashim, A.
    Kováč, J.
    Rajňák, M.
    Kopčanský, P.
    Makowski, M.
    Gojzewski, H.
    Molokáč, M.
    Hvizdák, L.
    Timko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1368025.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.-b
    75.60.-d
    87.50.Y-
    68.37.-d
    Opis:
    Magnetosomes are intracellular organelles of widespread aquatic microorganisms called Magnetotactic bacteria. At present they are under investigation especially in biomedical applications. This ability depends on the presence of intracellular magnetosomes which are composed of two parts: first, nanometer-sized magnetite $(Fe_{3}O_{4})$ or greigite $(Fe_{3}S_{4})$ crystals (magnetosome crystal), depending on the bacterial species; and second, the bilayer membrane surrounding the crystal (magnetosome membrane). The magnetosomes were prepared by biomineralization process of magnetotactic bacteria Magnetospirillum Magnetotacticum sp. AMB-1. The isolated magnetosome chains (sample M) were centrifugated at speed of 100000 rpm for 4 hours (sample UM) and sonicated at power of 120 W for 3 hours (sample SM), respectively. The prepared suspensions were investigated with respect to morphological, structural and magnetic properties. The results from scanning electron microscopy showed that isolated chains of magnetosomes were partially broken to smaller ones after ultracentrifugation. On the other hand the application of the sonication process caused the formation of individual magnetosomes (unordered in chain). These results were confirmed by coercivity and magnetization saturation measurements.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 198-199
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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