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Wyświetlanie 1-15 z 86
Tytuł:
The Influence of the Chemical Compounds οn the Zinc Oxide Nanostructures Growth in Chemical Bath Deposition
Autorzy:
Byrczek, M.
Malewicz, M.
Halek, G.
Teterycz, H.
Powiązania:
https://bibliotekanauki.pl/articles/1807559.pdf
Data publikacji:
2009-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
Opis:
In this paper, the results of the investigation the growth of the zinc oxide nanocrystals during chemical bath deposition will be presented. The influence of the chemical compounds on the shape and the composition of the nanostructures were researched. Chemical compounds like hexamethylenetetramine, zinc nitrate hexahydrate, urea and ascorbic acid were used in experiments.
Źródło:
Acta Physica Polonica A; 2009, 116, S; S-111-S-113
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Topographic Peculiarities of the Formation of Nanosized Particles from Metallopolymers
Autorzy:
Pomogailo, A. D.
Dzhardimalieva, G. I.
Rosenberg, A. S.
Powiązania:
https://bibliotekanauki.pl/articles/2035462.pdf
Data publikacji:
2002-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.-b
81.07.Bc
Opis:
The morphology of solid phase products of thermal transformation of transition metal acrylates or its cocrystallites is studied. The thermal transformation of the metal-containing monomers studied consists in dehydration, solid phase polymerization and thermolysis process. The topography of the initial compounds and solid phase products of thermal decay, as well as their composition, are analyzed by optical and electron microscopies. The average particle sizes, d$\text{}_{EM}$, are: 6.0-13.0 nm in the case of FeAcr$\text{}_{6}$ (based on the data of electron diffraction, the main product is Fe$\text{}_{3}$O$\text{}_{4}$), 6.0 nm for FeCoAcr$\text{}_{8}$ and Fe$\text{}_{2}$CoAcr$\text{}_{14}$ (Fe$\text{}_{3}$O$\text{}_{4}$, CoO, Fe$\text{}_{2}$CoO$\text{}_{4}$), and 6 nm for CoMal$\text{}_{2}$ (CoO). The material formed consists of nanosized metal particles uniformly allotted in polymer matrix.
Źródło:
Acta Physica Polonica A; 2002, 102, 1; 135-145
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Different Organic Gelating Agents on Grain Size of ZnO Nanoparticles
Autorzy:
Karaal, Ş.
Köse, H.
Aydin, A.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1218769.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Fw
81.07.Bc
Opis:
In this work, sol-gel method was used in order to synthesize ZnO nanoparticles. $Zn(CH_3COO)_2$·$2H_2O$ was used to obtain ZnO precursor solution. To investigate the effect of organic gelating agents on grain size, various organic gelating agents such as triethanolamine (TEA), glycerin (GLY), ethylene glycol (EG), citric acid (CA) and tartaric acid (TA) were used. X-ray diffraction analysis was used for phase identification and grain size calculation. ZnO powders were characterized by using Fourier-transform infrared spectroscopy, scanning electron microscopy and atomic force microscopy.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 338-340
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Grain Refinement after Various Thermo-Mechanical Treatments in AZ80 and ZK60 Magnesium Alloys
Autorzy:
Ryspaev, T.
Janecek, M.
Minárik, P.
Wesling, V.
Wagner, L.
Kral, R.
Powiązania:
https://bibliotekanauki.pl/articles/1419057.pdf
Data publikacji:
2012-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Gh
81.07.Bc
Opis:
The effect of thermal processing prior to severe plastic deformation by extrusion and swaging on grain refinement in ZK60 and AZ80 alloys was studied. The alloys received in direct-chill cast condition were homogenized at 415C and annealed (over-aged) at temperatures from 200 to 380°C. Both the direct-hill cast and over-aged conditions were extruded at T = 300C using an extrusion ratio of ER = 19. Hot extrusion resulted in substantial grain refinement in both cases, the effect being stronger in the over-aged material. The extruded bars were severe plastically deformed at 250C by swaging. Swaging refined further the grain size depending on the deformation ratio (number of passes). At optimal processing conditions the grain size was 450 nm and 570 nm for the AZ80 and ZK60 alloys, respectively.
Źródło:
Acta Physica Polonica A; 2012, 122, 3; 622-624
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Magnetic Proporties of Polymer Matrix Nanocomposites
Autorzy:
Ławecka, M.
Leonowicz, M.
Kopcewicz, M.
Ślawska-Waniewska, A.
Kozubowski, J.
Dzhardimalieva, G. I.
Rosenberg, A. S.
Pomogailo, A.
Powiązania:
https://bibliotekanauki.pl/articles/2035519.pdf
Data publikacji:
2002-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
82.35.Np
Opis:
Structure and magnetic properties of the thermal decomposition products of Fe(III)Co(II) acrylate complex were analysed. The crystalline phases, which were found in the fully processed material, at 643 K, were Fe$\text{}_{3}$O$\text{}_{4}$, CoFe$\text{}_{2}$O$\text{}_{4}$, and CoO and had a mean particle size of about 30 nm. In the intermediate stages of the thermolysis iron was present in a form of Fe$\text{}^{III}$ (trivalent low-spin iron), Fe$\text{}^{2+}$ (divalent high-spin iron), and Fe$\text{}_{3}$O$\text{}_{4}$. The coercivity and remanence were measured versus temperature in the range of 5-300 K, in 1.1 T applied field. Both, $\text{}_{M}$H$\text{}_{c}$ and M$\text{}_{r}$, decreased showing room temperature values of 0.038 T and 7.49 mT, for coercivity and remanence, respectively. At temperatures below 200 K the hysteresis loops were asymmetrical, opened and shifted towards negative field values.
Źródło:
Acta Physica Polonica A; 2002, 102, 2; 317-321
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Optical Properties of Co and Zn-Based Metal Oxide Nanoparticle Thin Films
Autorzy:
Gungor, E.
Gungor, T.
Caliskan, D.
Ozbay, E.
Powiązania:
https://bibliotekanauki.pl/articles/1032063.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
78.67.Bf
Opis:
ZnO, Co doped ZnO (ZnO:Co) and CoO thin films were deposited on glass substrates by using the spark discharge technique with Zn-Zn, Zn-Co and Co-Co metal electrodes (tips). The structural and optical properties of the films were characterized by X-ray diffraction, scanning electron microscopy measurements and UV-Vis spectrometry. Cubic phase reflection of CoO (200) was observed in the samples containing Co. The size of nanoparticles had varied between 38 nm and 200 nm in ZnO thin films. When Co electrode was used, spherical structure had deteriorated and clusters of particles, with smaller radii, were observed. In addition, when Co-Co electrode pairs were used, various cavities with different sizes were formed. Especially, it was observed that the optical transmittance had generally increased with the decreasing spark (charge) voltage, while increasing with the number of sparks. The Co-containing samples were green in color and it was observed that the loss of transmission appears in a specific region in the Co-doped ZnO thin films due to characteristic d-d transition of Co²⁺ ions. The thickness of the films had decreased with the increasing number of sparks. In addition, the band gap energy, E_{g}, evaluated by UV-Vis spectroscopy measurements has been shifted to higher wavelengths (red shift) for the ZnO:Co thin films.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 500-503
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetoelastic Properties of Hitperm-Type Alloys from Torque Moment
Autorzy:
Salach, J.
Bieńkowski, A.
Szewczyk, R.
Powiązania:
https://bibliotekanauki.pl/articles/1813578.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
75.80.+q
Opis:
The following paper presents the results of the investigation on the influence of the torque on the magnetic characteristics of the Hitperm-type $Fe_{41.5}Co_{41.5}Cu_1Nb_3B_{13}$ alloy, in as-quenched and nanocrystalline state. The methodology of application of the torque to the ring-shaped core is also described. This methodology gives a possibility of achieving uniform shearing stresses in the core. The results indicate that shearing stress sensitivity of Hitperm-type alloys depends on the annealing and nanocrystallization process. This effect should be considered during the development of magnetoelastic torque sensors.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 115-118
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum Effects in Electrical Conductivity and Photoconductivity of Single SbSI Nanowire
Autorzy:
Mistewicz, K.
Nowak, M.
Wrzalik, R.
Jesionek, M.
Szperlich, P.
Paszkiewicz, R.
Guiseppi-Elie, A.
Powiązania:
https://bibliotekanauki.pl/articles/1399097.pdf
Data publikacji:
2013-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Vb
81.07.Bc
73.63.Bd
Opis:
For the first time current quantization is reported for antimony sulfoiodide (SbSI) nanowires. It has been registered in current responses on electric field switching as well as on illumination on and off. Current steps determined in all experiments have been equal to each other within the experimental error. It has been explained by the quantized change of free carrier concentration in nanowire. Lateral dimensions of SbSI nanowires estimated from quantum steps are comparable with geometrical data reported for the same technology of material preparation.
Źródło:
Acta Physica Polonica A; 2013, 124, 5; 827-829
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanochemical Preparation and Magnetic Properties of Fe₃O₄/ZnS Nanocomposite
Autorzy:
Bujňáková, Z.
Zorkovská, A.
Kováč, J.
Powiązania:
https://bibliotekanauki.pl/articles/1032141.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
81.20.Ev
81.20.Wk
Opis:
Powder nanocomposite of Fe₃O₄/ZnS was prepared by mechanochemical synthesis in a planetary ball mill. In this reaction natural magnetite mineral Fe₃O₄ was used, together with zinc acetate (CH₃COO)₂Zn·2H₂O and sodium sulfide Na₂S·9H₂O, as precursors for the zinc sulfide ZnS. X-ray diffraction revealed that the sample is composed of small nanocrystalline particles, containing Fe₃O₄ and ZnS. The non-milled magnetite showed distinctive Verwey transition at around 120 K, this becomes suppressed after milling, as a consequence of structural disorder and presence of defects. Moreover, the reduction of saturation magnetization from 91 A m²/kg to 69.2 A m²/kg was observed, as a consequence of the milling process. The magnetization of the Fe₃O₄/ZnS nanocomposite was the lowest (34.5 A m²/kg), due to the milling and to the decreased weight fraction of the ferrimagnetic component. Nevertheless, the Fe₃O₄/ZnS sample demonstrates ferrimagnetic behavior as well, and its structure is less perturbed by milling, the Verwey transition, although less impressive, but is preserved.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1120-1122
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanocrystalline Nickel Oxide (NiO) Thin Films Grown on Quartz Substrates: Influence Of Annealing Temperatures
Autorzy:
Hajakbari, F.
Taheri Afzali, M.
Hojabri, A.
Powiązania:
https://bibliotekanauki.pl/articles/1033487.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Tv
81.07.Bc
81.15.cd
Opis:
In the present investigation, nanocrystalline NiO thin films were prepared by thermal oxidation annealing of DC magnetron sputtered Ni thin films on quartz substrates. The effect of annealing temperature on the films structural, morphological and optical properties was investigated. The XRD analysis shows that all prepared films were of NiO with cubic structure and (200) orientation. The thickness of NiO films was in range of 40-100 nm. The average crystallite size is found to increase from 16 to 36 nm and the optical band gap energy decreases from 3.62 to 3.38 eV by increasing the annealing temperature from 400°C to 600°C. The AFM and SEM results show that the annealing temperature effectively influences the surface morphology of the films.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 417-419
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication, Structural Characterization and Optical Properties of the Flower-Like ZnO Nanowires
Autorzy:
Feng, L.
Liu, A.
Ma, Y.
Liu, M.
Man, B.
Powiązania:
https://bibliotekanauki.pl/articles/1538755.pdf
Data publikacji:
2010-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
81.05.Dz
81.10.Aj
Opis:
Multipod flower-like zinc oxide (ZnO) nanowires have been successfully synthesized on Si(111) substrates using a pulsed laser deposition prepared Zn film as "self-catalyst" by the simple thermal evaporation oxidation of the metallic zinc powder at 850°C without any other catalysts or additives. The pre-deposited Zn films by pulsed laser deposition on the substrates can promote the formation of the ZnO nuclei effectively. Also it can further advance the growth of the flower-like ZnO nanowires accordingly. X-ray diffraction, scanning electron microscope, high-resolution transmission electron microscopy, Fourier transform infrared spectrum, and photoluminescence were used to analyze the structure, morphology, composition and optical properties of the as-synthesized products. The results demonstrate that the nanowires were single crystalline with hexagonal wurzite structure, grown along the [0001] in the c-axis direction. Room temperature photoluminescence spectrum of the ZnO nanowires shows a nearband-edge ultraviolet emission (peak at ≈ 384 nm) and a deep-level green emission (peak at ≈ 513 nm). In addition, the growth mechanism of the flower-like ZnO nanowires is discussed in detail.
Źródło:
Acta Physica Polonica A; 2010, 117, 3; 512-517
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure Studies on Mechanically Alloyed $Ni_{50}Ti_{50-x}Mo_{x}$ (x=10, 25, 40 at.%) Systems during Milling and after Annealing
Autorzy:
Panek, J.
Karolus, M.
Piasecki, K.
Powiązania:
https://bibliotekanauki.pl/articles/1398359.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
81.10.Jt
81.20.Ev
Opis:
The subject of this study is the phase composition evolution of $Ni_{50}Ti_{50-x}Mo_x$ (x=10, 25, 40 at.%) systems prepared by mechanical alloying in as-milled state and after subsequent heat treatment. During milling a mechanically induced solid state reaction between nickel, titanium and molybdenum was observed leading to the formation of nanocrystalline disordered solid solutions. As a result of heat treatment a creation of NiMo intermetallic phase was observed as well as structure relaxation of previously formed solid solutions.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1066-1068
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Properties of Nano-Crystalline Zirconia Thin Films Prepared at Different Post-Oxidation Annealing Times
Autorzy:
Hojabri, A.
Pourmohammad, S.
Powiązania:
https://bibliotekanauki.pl/articles/1398740.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Tv
81.07.Bc
81.15.cd
Opis:
The zirconia (ZrO₂) is one of the transition-metal oxides with most excellent optical properties which thus attracts great attention in optical engineering. A variety of methods were used for deposition of ZrO₂ thin films on different substrates. In the present work, homogenous, transparent nanocrystalline zirconia thin films were grown by thermal oxidation of zirconium (Zr) thin films deposited on quartz substrate using DC magnetron sputtering technique. The objective of this study is to reveal the effect of thermal oxidation time on structural and optical properties of deposited films. The XRD results revealed the formation of single phase ZrO₂ with tetragonal structure in the films at different thermal oxidation times. The optical constant of ZrO₂ thin films was calculated from the UV-visible transmission spectra. It was found that the increase of thermal oxidation time leads to the increase of transmittance and optical band gap energy of the films. The AFM results showed that thermal oxidation time influences the surface morphology of the films.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 647-649
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanochemistry of Solids: New Prospects for Extractive Metallurgy, Materials Science and Medicine
Autorzy:
Baláž, P.
Baláž, M.
Achimovičová, M.
Bujňáková, Z.
Dutková, E.
Powiązania:
https://bibliotekanauki.pl/articles/1375090.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Dz
81.20.Wk
81.07.Bc
Opis:
In this review paper recent advances in chalcogene mechanochemistry are described. Three selected areas are being covered, i.e. metallurgy, materials science, and medicine. In extractive metallurgy, the processing of copper arsenic mineral enargite ($Cu_3AsS_4$) with the aim of its dearsenification and subsequent preparation of a new anticancer drug ($Na_3AsS_4$) and of copper in nanocrystalline state ( ≈ 20 nm) illustrate the non-traditional prospect of ore treatment. In material science, the new nanocrystalline semiconductors were synthesized mechanochemically, e.g. selenides of zinc and lead (ZnSe, PbSe) and bismuth sulphide ($Bi_2S_3$). Metal and chalcogene were applied as reaction precursors. In some cases, the amino acids (cystine, cysteine) were applied as sulphur precursor, in order to provide reactive sites on synthesized solid (PbS) for bioconjugation and to prevent agglomeration. The concept of nanomilling is described as a way to prepare effective substances for cancer treatment in medicine. In vitro activity of realgar ($As_4S_4$) as an example is described. In all three areas the focus is aimed also on industrial applications where suitable large-scale mills are described. The described examples represent the contemporary aim of mechanochemists - to prepare substances with the desired properties in a reproducible way under easy-operating, environmentally friendly and essentially waste-free conditions.
Źródło:
Acta Physica Polonica A; 2014, 126, 4; 879-883
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanochemically Synthesized Nanocrystalline $Sb_2S_3$ Particles
Autorzy:
Dutková, E.
Sayagués, M.
Real, C.
Zorkovská, A.
Baláž, P.
Šatka, A.
Kováč, J.
Ficeriová, J.
Powiązania:
https://bibliotekanauki.pl/articles/1375343.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Hd
81.07.Bc
81.20.Wk
Opis:
Nanocrystalline $Sb_2S_3$ particles have been synthesized from Sb and S powders by high-energy milling in a planetary mill using argon protective atmosphere. X-ray diffraction, particle size analysis, scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, electron diffraction, high resolution transmission electron microscopy, UV-VIS, and differential scanning calorimetry methods for characterization of the prepared particles were applied. The powder X-ray diffraction pattern shows that $Sb_2S_3$ nanocrystals belong to the orthorhombic phase with calculated crystallite size of about 36 nm. The nanocrystalline $Sb_2S_3$ particles are constituted by randomly distributed crystalline nanodomains (20 nm) and then these particles are forming aggregates. The monomodal distribution of $Sb_2S_3$ particles with the average hydrodynamic parameter 210 nm was obtained. The quantification of energy dispersive X-ray spectroscopy analysis peaks give an atomic ratio of 2:3 for Sb:S. The optical band gap determined from the absorption spectrum is 4.9 eV, indicating a considerable blue shift relative to the bulk $Sb_2S_3$. Differential scanning calorimetry curves exhibit a broad exothermic peak between 200 and 300°C, suggesting recovery processes. This interpretation is supported by X-ray diffraction measurements that indicate a 23-fold increase of the crystallite size to about 827 nm as a consequence of application of high temperature process. The controlled mechanochemical synthesis of $Sb_2S_3$ nanoparticles at ambient temperature and atmospheric pressure remains a great challenge.
Źródło:
Acta Physica Polonica A; 2014, 126, 4; 943-946
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 86

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