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Tytuł:
Characteristics and Electrochemical Performance of $TiO_2$:MWCNT Nanocomposite Anodes for Li-Ion Batteries
Autorzy:
Guler, M.
Cetinkaya, T.
Cevher, O.
Tocoglu, U.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1218684.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.45.Mp
61.48.De
Opis:
In this study, highly porous buckypapers were manufactured via vacuum filtration techniques and nanocrystalline $TiO_2$ thin films were deposited on buckypapers using reactive radio frequency magnetron sputtering to understand the role of the deposition power. In addition, the effects of the deposition parameters on the electrochemical properties as an anode electrode for Li-ion batteries have also been studied.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 322-324
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Combined treatments of modified atmosphere packaging with aminoethoxyvinylglycine maintained fruit quality in sweet cherry throughout cold storage and shelf life
Autorzy:
Guler, S.K.
Karakaya, O.
Karakaya, M.
Ozturk, B.
Aglar, E.
Yarılgac, T.
Gün, S.
Powiązania:
https://bibliotekanauki.pl/articles/12613537.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
wild cherry
Prunus avium
fruit quality
fruit firmness
fruit colour
fruit storage
weight loss
shelf life
packaging
modified atmosphere
aminoethoxyvinylglycine
phenolic compound
total phenol content
Opis:
The effects of combined aminoethoxyvinylglycine (AVG) and modified atmosphere packaging (MAP) treatments on quality attributes of ‘0900 Ziraat’ sweet cherry fruit during the cold storage and shelf life were investigated in this study. Significantly lower weight loss and decay ratios were observed in all treatments throughout the cold storage period as compared to the control. A similar case was also observed referring to the shelf life. MAP treatments were found to be more effective in retarding the weight loss and decay ratio. Higher hue angle values were measured from AVG-treated fruit at harvest. Similarly, hue angle of AVG and MAP-treated fruit were also higher than for the control in all periods of cold storage and on the 7th and 21st day of shelf life. AVG-treated fruit had higher firmness values than the control at harvest. However, higher firmness values were measured from MAP-treated fruit during the cold storage and shelf life. At the end of cold storage, lower SSC and higher titratable acidity values were observed in AVG and MAP-treated fruit than in the control. AVG + MAP treatments yielded significantly higher vitamin C, total phenolics and antioxidant activity values than the control. Contrarily, the control fruit had significantly higher total monomeric anthocyanin than the other treatments. Based on current findings, it was concluded that combined AVG + MAP treatments could be used as a beneficial tool to maintain the quality of sweet cherry fruit throughout the cold storage and shelf life.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 5; 13-26
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cr and V Substitution in the LiMn₂O₄Spinel Positive Electrode Li-Ion Batteries
Autorzy:
Akbulut, A.
Cetinkaya, T.
Guler, M.
Uysal, M.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1401245.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.47.Aa
81.20.Fw
81.15.-z
Opis:
In this study, $LiCr_{0.2}V_{0.4}Mn_{1.4}O_4$ cathode active electrode materials were produced via a facile sol-gel method at 800°C. The surfaces of the $LiCr_{0.2}V_{0.4}Mn_{1.4}O_4$ cathode active electrode materials were then coated with Cu in order to increase the conductivity and suppress the manganese ion dissolution into the electrolyte. The structure and electrochemical properties of the obtained Cr and V substituted LiMn₂O₄ powders were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), galvanostatic charge- discharge test and electrochemical impedance spectroscopy (EIS). The improvement in the cycling performances attributed to stabilization of spinel structure by bication ion substation and Cu coating on the spinel particles. EIS analysis confirmed that bication doping and conductive Cu coating contributed stability of the spinel electrodes and provided stable electrolyte/electrode interface due to the suppression of electrolyte decomposition
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1019-1022
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cyclic Performance Study of Silicon/Carbon Nanotube Composite Anodes Using Electrochemical Impedance Spectroscopy
Autorzy:
Tocoglu, U.
Cevher, O.
Cetinkaya, T.
Guler, M.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1181928.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.47.Aa
Opis:
Silicon based carbon nanotube composites were produced and their galvanostatic cycling properties analyzed depended on the electrochemical impedance spectroscopy. Composite anodes were produced via vacuum filtration and DC magnetron sputtering technique. Carbon nanotube papers were produced with vacuum filtration as substrate for silicon deposition and silicon was sputtered onto carbon nanotube papers via DC magnetron sputtering. Scanning electron microscopy and X-ray diffraction analysis were conducted for structural analysis of anodes. CR2016 coin cells were assembled for electrochemical tests. Electrochemical performance of anodes was tested via galvanostatic charge/discharge (100 cycles) analysis. Electrochemical impedance spectroscopy was carried out at every 25 charge/discharge cycle to determine relation between cyclic performance and electrochemical impedance of cells.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 290-292
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of RF Power on Electrical and Structural Properties of Sputtered $SnO_2$:Sb Thin Films
Autorzy:
Cevher, O.
Guler, M.
Tocoglu, U.
Cetinkaya, T.
Akbulut, H.
Okumus, S.
Powiązania:
https://bibliotekanauki.pl/articles/1218075.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.-a
68.55.ag
81.15.Cd
Opis:
In this work, antimony doped tin oxide ($SnO_2$:Sb) thin films were fabricated using a radio frequency magnetron sputtering system on Si wafer and glass substrates. The base pressure in the sputtering chamber was 1.0 Pa. The $SnO_2$:Sb thin films were deposited for 1.0 h in a mixture of Ar and $O_2$ environment with $O_2$/Ar ratio of 10/90 at 75, 100, and 125 W RF sputtering powers. The microstructure of $SnO_2$:Sb thin films was assessed using a field emission scanning electron microscopy. The crystallographic structure of the sample was determined by X-ray diffraction. The average surface roughness $(R_{a})$ was measured with atomic force microscopy. The electrical resistivity of the deposited films was measured by the four-point-probe method. The thicknesses of the films were measured by surface profiler.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 293-295
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Substrate Temperature on Structural Properties of Tin Oxide Films Produced by Plasma Oxidation after Thermal Evaporation
Autorzy:
Alaf, M.
Guler, M.
Gultekin, D.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1399830.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.fm
73.61.At
81.16.Pr
Opis:
In this study, tin film was thermally evaporated onto a stainless steel substrate in an argon atmosphere. The tin films were then subjected to a DC plasma oxidation process using an oxygen/argon gas mixture. Three different substrate temperatures (100°C, 150°C, and 200°C) and three different oxygen partial pressures (12.5%, 25%, and 50%) were used to investigate the physical and microstructural properties of the films. The surface properties were studied by scanning electron microscopy, X-ray diffraction, atomic force microscopy and a four-point probe electrical resistivity measurement. The grain size and texture coefficient of the tin oxide films were calculated. Both SnO and $SnO_2$ films with grain sizes of 13-43 nm were produced, depending on the oxygen partial pressure. SnO films have flower- and flake-like nanostructures, and $SnO_2$ films have grape-like structures with nanograins. The resistivity values for the $SnO_2$ phase were found to be as low as $10^{-5}$ Ω cm and were observed to decrease with increasing substrate temperature.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 326-329
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrochemical Characterization of the Powder Silicon Anodes Reinforced with Graphite Using Planetary Ball Milling
Autorzy:
Cetinkaya, T.
Cevher, O.
Tocoglu, U.
Guler, M.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1399947.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.uf
81.05.uf
81.20.Ev
82.45.Fk
82.47.Aa
Opis:
Mixed silicon/graphite anode materials were produced via mechanical milling process. The morphologies of mixed powders and electrodes were characterized via scanning electron microscopy and X-ray diffraction pattern. Electrochemical tests were performed by coin-type (CR2016) test cells. The cells were cyclically tested on a battery tester, and discharge capacities of produced anode materials were investigated with using constant current 300 mA/g over a voltage range of 80 mV-1.2 V.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 393-395
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrochemical Performance of Silicon/MWCNT Composite Electrodes for Lithium Ion Batteries
Autorzy:
Cetinkaya, T.
Tocoglu, U.
Cevher, O.
Guler, M.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1195120.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Ni
81.20.Ev
82.45.Fk
82.47.Aa
Opis:
Silicon/MWCNT composite electrodes were produced using high-speed planetary ball milling. Content of MWCNT were altered in silicon/MWCNT composite electrodes and effect of MWCNT content on the electrochemical performance of silicon electrodes were characterized by scanning electron microscopy and X-ray diffraction techniques. Coin type CR2016 test cells were assembled by using produced nanocomposite electrodes. Prepared test cells were electrochemically cycled at a current density of 200 mA/g. Furthermore, cyclic voltammetry curve of composite electrodes were performed to investigate electrochemical reactions between electrode and electrolyte.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 285-287
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Li-Air Batteries With EC-DEC Based Nanocomposite Electrolytes
Autorzy:
Akbulut, A.
Guler, M.
Cetinkaya, T.
Uysal, M.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1401250.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.45.Gj
88.80.ff
82.45.Xy
Opis:
Electrolytes based on organic carbonate solvents of ethylene carbonate (EC) and diethyl carbonate (DEC) were prepared by using LiPF₆ as the Li-source. Nano sized Al₂O₃ (50 nm) was used as a reinforcing component in order to control corrosion and Li₂CO₃ formation. Corrosion of the Li foil anode and electrochemical tests were performed by using EC/DEC/LiPF₆ and nanocomposite EC/DEC/LiPF₆/5wt.% Al₂O₃ electrolytes. Electrochemical tests were performed in the swagelok cells by using Li foil anode and carbon air cathode electrodes. Structural tests were carried out by using scanning electron microscopy (SEM), x-ray diffraction (XRD) and Raman spectroscopy. Results revealed that incorporation of nano Al₂O₃ leads to a decrease of corrosion rate of Li anode and a small decrease in the capacity of the air cells.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1023-1025
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Excitation and Temperature Tuned Photoluminescence in Tl$\text{}_{2}$In$\text{}_{2}$S$\text{}_{3}$Se Layered Crystals
Autorzy:
Guler, I.
Goksen, K.
Gasanly, N. M.
Powiązania:
https://bibliotekanauki.pl/articles/2047173.pdf
Data publikacji:
2006-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
71.20.Nr
78.20.-e
78.55.-m
Opis:
Photoluminescence spectra of Tl$\text{}_{2}$In$\text{}_{2}$S$\text{}_{3}$Se layered single crystals have been studied in the wavelength region of 535-725 nm and in the temperature range of 22-58 K. Two photoluminescence bands centered at 564 (2.20 eV, A-band) and 642 nm (1.93 eV, B-band) were observed at T = 22 K. Variations of both bands have been investigated as a function of excitation laser intensity in the range from 16 to 516 mW cm$\text{}^{-2}$. These bands are attributed to recombination of charge carriers through donor-acceptor pairs located in the band gap. Radiative transitions from shallow donor levels located 0.02 and 0.01 eV below the bottom of conduction band to acceptor levels located 0.05 and 0.44 eV above the top of the valence band are suggested to be responsible for the observed A- and B-bands in the photoluminescence spectra, respectively.
Źródło:
Acta Physica Polonica A; 2006, 110, 6; 823-831
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Tin Oxide Based Nanocomposites for Li-Ion Batteries
Autorzy:
Cevher, O.
Cetinkaya, T.
Tocoglu, U.
Guler, M.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1399889.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
88.30.rh
81.05.Dz
81.15.Cd
82.47.Aa
Opis:
In this work, tin oxide ($SnO_2$) films were deposited on multiwall carbon nanotube buckypaper using a rf magnetron sputter process in a mixed oxygen/argon (1/9) gas environment. Conditions for the growth of $SnO_2$ thin films on multiwall carbon nanotube buckypaper by rf sputtering are: target composition $SnO_2$ (99.999 wt%); total system pressure 1 Pa; sputtering power (rf) 75, 100 and 125 W, respectively; $O_2//Ar$ (1/9) gas mixture. The surface morphology of the $SnO_2$ multiwall carbon nanotube composite films was investigated by scanning electron microscopy. The crystallographic structure of the sample was determined by X-ray diffraction. The electrochemical properties of $SnO_2$ multiwall carbon nanotube composite anodes were investigated by galvanostatic charge-discharge experiments.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 358-360
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanocomposite ZnO:MWCNT Thin Films for Li-Ion Batteries Prepared via Reactive Magnetron Sputtering
Autorzy:
Guler, M.
Cetinkaya, T.
Cevher, O.
Tocoglu, U.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1195252.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.47.Aa
61.48.De
77.55.hf
Opis:
In this study, ZnO/MWCNT buckypaper nanocomposite structures were obtained as an anode electrode material for Li-ion batteries. MWCNT based buckypapers were produced via vacuum filtration techniques and the surfaces of the buckypapers were coated with ZnO in order to increase stability and mechanical integrity during charging and discharging processes. The effect of deposition powers on the battery performance is also investigated.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 319-321
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanostructured Silicon Thin Film Electrodes for Li-Ion Batteries
Autorzy:
Tocoglu, U.
Cetinkaya, T.
Cevher, O.
Oguz Guler, M.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1399941.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.uf
81.15.Cd
82.47.Aa
Opis:
In this study we produced nanostructured silicon thin films as lithium ion battery electrodes. Films were sputtered onto stainless steel substrates from high purity silicon target via dc magnetron sputtering technique with using different powers. Morphology and crystal structure of films were characterized with the use of scanning electron microscopy, X-ray diffraction and energy dispersive spectroscopy analysis, respectively. The thickness of films was measured by using surface profiler. Coin type test cells were assembled in argon filled glove box. Electrochemical performance of cells was tested on an electrochemical analyzer using constant current densities over a voltage range of 0.2-2 V.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 380-382
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel Titanium Dioxide Based Nanocomposite Anodes for Li-Ion Batteries
Autorzy:
Oguz Guler, M.
Cevher, O.
Tocoglu, U.
Cetinkaya, T.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1399946.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.48.De
82.45.Mp
82.47.-a
Opis:
Carbon nanotube thin sheets - buckypapers - were prepared from multi-walled carbon nanotubes oxidized with different oxidation agents. Titanium dioxide films were then deposited by thermal evaporation of Ti films on buckypapers substrates followed by in situ dc plasma oxidation. The effect of oxidation power on the structural, compositional and electrochemical properties of the films was investigated.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 390-392
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Perturbation solutions for magnetohydrodynamics (MHD) flow of in a non-Newtonian fluid between concentric cylinders
Autorzy:
Yurusoy, M.
Guler, O. F.
Powiązania:
https://bibliotekanauki.pl/articles/265393.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przepływ MHD
technika zaburzeń
przepływ pierścieniowy
MHD flow
perturbation technique
annular flow
third grade fluid
Opis:
The steady-state magnetohydrodynamics (MHD) flow of a third-grade fluid with a variable viscosity parameter between concentric cylinders (annular pipe) with heat transfer is examined. The temperature of annular pipes is assumed to be higher than the temperature of the fluid. Three types of viscosity models were used, i.e., the constant viscosity model, space dependent viscosity model and the Reynolds viscosity model which is dependent on temperature in an exponential manner. Approximate analytical solutions are presented by using the perturbation technique. The variation of velocity and temperature profile in the fluid is analytically calculated. In addition, equations of motion are solved numerically. The numerical solutions obtained are compared with analytical solutions. Thus, the validity intervals of the analytical solutions are determined.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 1; 199-211
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 27

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