Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "78.67 Bf" wg kryterium: Temat


Tytuł:
The Antibacterial Activities of Ag/$Nano-TiO_2$ Modified Silicone Elastomer
Autorzy:
Wang, L.
Sun, T.
Zhou, S.
Shao, L.
Powiązania:
https://bibliotekanauki.pl/articles/1215694.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Bf
Opis:
We studied the ability of Ag/$nano-TiO_2$ to inhibit Staphylococcus aureus growth on silicone elastomer material. Ag/$nano-TiO_2$ silicone elastomer was prepared with different concentrations of 0%, 2%, 4%, 6%, 8%, 10%. The antibacterial efficacy of Ag/$nano-TiO_2$ silicone elastomer was determined by the inhibition zone method and the impregnated culture method. The antibacterial timeliness of Ag/$nano-TiO_2$ silicone elastomer was tested by direct contact method. The samples were kept through thermal aging process in an accelerated aging chamber. The effect of concentrations of Ag/$nano-TiO_2$ was insignificant (P < 0.05). There was significant difference between the Ag/$nano-TiO_2$ silicone elastomer and the blank silicone elastomer (P < 0.5). There was also significant difference among specimen groups whose aging periods were 50°C, 100°C, 150°C, 200°C for 87 h (P < 0.5). The silicone elastomer with different concentrations of Ag/$nano-TiO_2$ effectively inhibits Staphylococcus aureus growth.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 248-250
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
XPS and Raman Characterizations of $Zn_{1-x}Cd_{x}O$ Films Grown at the Different Growth Conditions
Autorzy:
Shtepliuk, I.
Khyzhun, O.
Lashkarev, G.
Khomyak, V.
Lazorenko, V.
Powiązania:
https://bibliotekanauki.pl/articles/1403642.pdf
Data publikacji:
2012-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Et
78.67.Bf
Opis:
X-ray photoelectron spectroscopy was employed to characterize the surface chemistry and electronic properties of the $Zn_{1-x}Cd_{x}O$ semiconductor systems obtained at the different growth conditions. The effect of the growth conditions on the core and valence band spectra as well as room-temperature photoluminescence of the $Zn_{1-x}Cd_{x}O$ films was investigated and discussed. Behavior of the X-ray photoelectron spectroscopy peaks indicated an increase of the cadmium and a depletion of the oxygen concentrations upon changing the Ar/$O_2$ gas ratio and dc power.
Źródło:
Acta Physica Polonica A; 2012, 122, 6; 1034-1038
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of $Ar//O_2$ Gas Ratio on the Properties of the $Zn_{0.9}Cd_{0.1}O$ Films Prepared by DC Reactive Magnetron Sputtering
Autorzy:
Shtepliuk, I.
Lashkarev, G.
Khomyak, V.
Marianchuk, P.
Koreniuk, P.
Myroniuk, D.
Lazorenko, V.
Timofeeva, I.
Powiązania:
https://bibliotekanauki.pl/articles/1492665.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.55.Et
78.67.Bf
Opis:
$Zn_{0.9}Cd_{0.1}O$ ternary alloys have been grown on the sapphire substrates by using the direct current (dc) magnetron sputtering. X-ray diffraction measurements showed that all samples were highly oriented films along the c-axis perpendicular to the substrate surface. X-ray diffraction confirmed that the crystal quality of $Zn_{0.9}Cd_{0.1}O$ films can be controlled by changing the gas ratio of $Ar//O_2$. The optical properties of these films have been investigated by means of the optical transmittance and the low-temperature photoluminescence spectra. It was found that the optical band gap of the deposited films can be tuned by growth parameters. The luminescence processes are considered in the terms of alloy fluctuation.
Źródło:
Acta Physica Polonica A; 2011, 120, 6A; A-061-A-065
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Triangular Silver Nanoparticles: Their Preparation, Functionalisation and Properties
Autorzy:
Kelly, J.
Keegan, G.
Brennan-Fournet, M.
Powiązania:
https://bibliotekanauki.pl/articles/1419538.pdf
Data publikacji:
2012-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Bf
81.07.Lk
Opis:
This paper reports our progress towards developing a reproducible and rapid method to prepare triangular silver nanoplates. The methods are all based on a seed-mediated procedure involving the reduction of silver ions with ascorbic acid in aqueous solution and have variously involved polyvinylalcohol, citrate, and polystyrenesulphonate as modifiers. The triangular silver nanoplate sols have well defined local surface plasmon resonances, which can be tuned throughout the visible and near IR. Aspect ratio (the ratio of edge length to thickness) is shown to be a fundamental parameter determining the triangular silver nanoplate sol properties including, the position of their local surface plasmon resonances maxima and suppression of local surface plasmon resonance retardation effects. The high ensemble sensitivities of the triangular silver nanoplate sol local surface plasmon resonance to changes in the surrounding refractive index within the spectral range appropriate for biosensing is attributed to their high aspect ratio. Silver nanoparticles are more challenging to functionalise than the analogous gold systems, as they are prone to oxidation and are susceptible to degradation by chloride ions. Two methods to stabilise triangular silver nanoplates (treating with thiols and coating with gold) and the formation of gold nanoboxes from the triangular silver nanoplates are also described.
Źródło:
Acta Physica Polonica A; 2012, 122, 2; 337-345
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:
Multi-Color Emission in Quantum-Dot-Quantum-Well Semiconductor Heteronanocrystals
Autorzy:
Kostić, R.
Stojanović, D.
Powiązania:
https://bibliotekanauki.pl/articles/1795612.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.21.La
78.67.Bf
Opis:
We present calculation results of multi-color spontaneous emission from quantum-dot-quantum-well semiconductor heteronanocrystals. Our theoretical results explain experimental results of onion-like spherical system similar to: CdSe (core), ZnS (shell), CdSe (shell) spherical quantum dots surrounded by ZnS. We demonstrate influence of shell thickness to exciton localization in distinct layers of heteronanocrystals. Multi-color emission of such heterosystem is determined by l=0, n=1 state localization in CdSe core and by l=0, n=2 state localization in CdSe shell.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 598-602
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiple Exciton Generation in InAs Nanocrystals
Autorzy:
Kowalski, P.
Machnikowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1811947.pdf
Data publikacji:
2008-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Bf
73.22.Dj
Opis:
We study a simple theoretical model of multiple exciton generation by a single high-energy photon absorbed in an InAs nanocrystal. We calculate the Coulomb matrix element for the electron-trion coupling in an InAs nanocrystal and show that due to the resulting coupling between single-pair and two-pair states the latter becomes weakly optically active.
Źródło:
Acta Physica Polonica A; 2008, 114, 5; 1187-1192
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of Magnetic Hyperfine Field Distribution for Spherical Nanoparticles of bcc Structure
Autorzy:
Szumiata, T.
Gzik-Szumiata, M.
Brzózka, K.
Gawroński, M.
Górka, B.
Powiązania:
https://bibliotekanauki.pl/articles/1813877.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Bf
76.80.+y
Opis:
We propose a simple model for temperature evolution of magnetic hyperfine field distribution of spherical bcc Fe nanoparticles. We performed mean field approximation calculations of mean spin value in each spherical shell of nanoparticle. Considering magnetic hyperfine field values reported for iron thin films we predicted possible values of hyperfine fields in the internal and surface region of the particles as a function of temperature.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 537-540
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Properties of Black Silicon with Precipitated Silver and Gold Nanoparticles
Autorzy:
Jarimaviciute-Zvalioniene, R.
Prosycevas, I.
Kaminskiene, Z.
Lapinskas, S.
Powiązania:
https://bibliotekanauki.pl/articles/1492963.pdf
Data publikacji:
2011-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.-e
78.67.Bf
78.67.Rb
Opis:
Black porous silicon is a new material with low light reflectance and high light absorbance values. Black porous silicon layers are especially useful and important in solar energy conversion. In this work black porous silicon plates were prepared by wet chemical metal-assisted method. Silver and gold nanoparticles were precipitated from colloidal silver nitrate and chloroauric acid solutions. Obtained black porous silicon samples with precipitated nanoparticles were investigated by scanning electron microscope combined with energy dispersive X-ray spectrometer, ultraviolet and visible light spectrometer, the Fourier transformation infrared spectrometer. Scanning electron microscopy and energy dispersive X-ray analysis have revealed the presence of silver and gold nanoparticles on black porous silicon surface. Silver nanoparticles size varied from 30 to 100 nm, gold - from 20 to 70 nm. During UV-VIS analysis significant changes in reflectance of processed black porous silicon samples were obtained. Reflectance of black porous silicon samples was lower than 10%. The Fourier transform infrared analysis has revealed decrease in reflectance in far infrared region. Changes in the Fourier transform infrared spectra in "fingerprint" zone prove modification of the surface of black porous silicon layers after precipitation of metal nanoparticles.
Źródło:
Acta Physica Polonica A; 2011, 120, 5; 942-945
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Optical Constants of Nanocluster CdO Thin Films Deposited by Sol-Gel Technique
Autorzy:
Serbetci, Z.
Gunduz, B.
Al-Ghamdi, A.
Al-Hazmic, F.
Arık, K.
El-Tantawy, F.
Yakuphanoglu, F.
Farooq, W.
Powiązania:
https://bibliotekanauki.pl/articles/1205426.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Bf
78.20.Ci
81.20.Fw
Opis:
The optical properties of the CdO and Pt doped CdO thin films synthesized by sol-gel technique were investigated. The lowest grain size value (81.34 nm) was found to be for CdO thin film. The Pt doped CdO films are transformed to clusters with nanoparticles. The transparency properties of the CdO thin film is changed with Pt doping. The plots of refractive index indicate abnormal and normal dispersion regions. The refractive index values of the CdO thin film are changed with Pt doping. The direct optical band gap values of the films were changed with doping of Pt. The film of 0.5% Pt doped CdO indicates the lowest optical band gap value (2.421 eV). The imaginary parts of the optical conductivity of the CdO and Pt doped CdO thin films are higher than that of the real parts of the optical conductivity.
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 798-807
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Facile synthesis and characterization of zinc tetranitro phthalocyanine-MWCNTs nanocomposites with efficient visible-light-driven photocatalytic activity
Autorzy:
Wan, Yi
Chen, Shuang
Wang, Guanqiu
Liang, Qian
Li, Zhongyu
Xu, Song
Powiązania:
https://bibliotekanauki.pl/articles/1158623.pdf
Data publikacji:
2016-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Bf
81.05.Zx
81.07.Pr
Opis:
Novel zinc tetranitro-phthalocyanine (ZnTNPc) supported by multi-walled carbon nanotubes hybrid composites were facilely prepared by a method of ultrasonic impregnation and their photocatalysis behavior was studied. The as-prepared ZnTNPc-MWCNTs composites were characterized by scanning electron microscopy, X-ray diffraction, diffuse reflectance spectra, transmission electron microscopy, thermogravimetric analysis, and the Fourier transform infrared spectra. The results showed that the ZnTNPc was not only grown on the multi-walled carbon nanotubes but also uniformly disturbed without aggregation. Compared with pure ZnTNPc and MWCNTs, ZnTNPc-MWCNTs nanocomposites presented a significantly enhanced photocatalytic activity for the degradation of rhodamine B under visible-light irradiation. Furthermore, a possible mechanism for the photodegradation of rhodamine B was also proposed.
Źródło:
Acta Physica Polonica A; 2016, 130, 3; 785-790
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Nanoparticles in MCM-41 Type Mesoporous Silica
Autorzy:
Surowiec, Z.
Bierska-Piech, B.
Wiertel, M.
Budzyński, M.
Goworek, J.
Powiązania:
https://bibliotekanauki.pl/articles/1811605.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Bf
81.07.Bc
76.80.+y
Opis:
Structural phase transformations and magnetic properties of mesoporous MCM-41 template modified with iron and nickel salts were studied by nitrogen physisorption, X-ray diffraction, Mössbauer spectroscopy and transmission electron microscopy. The FeNi-oxide or the bimetallic crystal structure is formed for low and high Ni concentrations, respectively. The average size of nanoparticles is about 10 nm. About 70% of particles exist in a superparamagnetic state at room temperature.
Źródło:
Acta Physica Polonica A; 2008, 114, 6; 1605-1613
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical and Structural Properties of Cu Doped ZnS Nanocrystals: Effect of Temperature and Concentration of Capping Agent
Autorzy:
Hasanzadeh, J.
Powiązania:
https://bibliotekanauki.pl/articles/1398921.pdf
Data publikacji:
2016-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.46.-w
61.46.Hk
78.67.Bf
78.67.Hc
Opis:
We have provided the Cu doped zinc sulfide (ZnS:Cu) nanoparticles using a wet chemical synthesis. In principle, the nanoparticles are provided by mixing the reactants in a double distilled water solvent. We have used the mercaptopropionic acid as the capping agent. We have obtained the physical properties of the nanoparticles using the methods: UV absorption, photoluminescence spectroscopy, and X-ray diffraction analysis. The average size of nanoparticles is obtained in the range 3-6 nm. In addition, the X-ray diffraction pattern of ZnS:Cu nanoparticles reveals a zinc-blende crystal structure at room temperature.
Źródło:
Acta Physica Polonica A; 2016, 129, 6; 1147-1150
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Synthesis and Properties of High Surface Area $Fe_{2}O_{3}$ Materials
Autorzy:
Surowiec, Z.
Gac, W.
Wiertel, M.
Powiązania:
https://bibliotekanauki.pl/articles/1506442.pdf
Data publikacji:
2011-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.80.+y
78.67.Bf
78.67.Rb
75.20.-g
Opis:
Two types of the silica materials were used for the preparation of iron oxides. The MCM-48 type silica support and wide-pore silica gel were impregnated with iron nitrates. The samples were investigated by the nitrogen adsorption/desorption method, X-ray diffraction, scanning electron microscopy, and $\text{}^{57}Fe$ Mössbauer spectroscopy. Redox properties were studied by the temperature programmed reduction method. Strongly dispersed hematite was evidenced on the supports. An application of the MCM-48 silica mesoporous materials led to the development of the oxide phases within the ordered porous structure. The detailed temperature programmed reduction studies evidenced slight differences of the redox properties of the species located within the silica templates and after their removal. Magnetic properties of iron oxides were related to the porous structure of the silica supports. The Mössbauer study of high surface area materials Fe/$SiO_{2}$ and Fe/MCM-48 type silicate templates revealed existence of ferro- and superparamagnetic phases. The relative contribution of the superparamagnetic doublet component in Mössbauer spectra is 15% and 80% for Fe/$SiO_{2}$/c and Fe/MCM-48/c samples, respectively.
Źródło:
Acta Physica Polonica A; 2011, 119, 1; 18-20
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Annealing Temperature on $Y_2O_3:SiO_2$ Nanocomposite Prepared by Sol-Gel Process
Autorzy:
Ahlawat, R.
Aghamkar, P.
Powiązania:
https://bibliotekanauki.pl/articles/1205213.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.46.Bc
61.46.Df
78.67.Bf
Opis:
Oxide nanoparticles embedded in a polymer matrix produce nanocomposites which are useful for optics and electronic applications. Yttrium oxide nanoparticles have received much attention due to their various properties and are significantly used in fundamental and application oriented fields. The present paper reports the influence of annealing temperature on the $Y_2O_3:SiO_2$ nanocomposite prepared by sol-gel process. $Y(NO_3)_3 ·4H_2O$ and tetraethoxysilane were used as precursors and obtained powdered form of $Y_2O_3:SiO_2$ composite. The powder sample was annealed at 500C and 900C for 6 h which were characterized by X-ray diffraction, Fourier transform infrared and transmission electron microscope. X-ray diffraction data described that the broadening of peaks decreases with increase in annealing temperature which may be due to the increase in particle size. Sample analyzed by Fourier transform infrared and transmission electron microscopy confirmed the grain size dependence on annealing temperature. Cubic phase of yttrium oxide crystal structure was obtained within the silica matrix. The nanocrystallites size has been calculated using Debye-Scherrer formula, Williamson-Hall plot and transmission electron micrographs and compared at two different temperatures (a) 500C and (b) 900C.
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 736-739
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies