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Wyświetlanie 1-15 z 18
Tytuł:
The Effect of Calcination Temperature on the Electrochemical Performance of ZnO Coated $LiMn_2O_4$/MWCNT Nanocomposite Cathodes
Autorzy:
Akbulut, A.
Cetinkaya, T.
Guler, M.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1218726.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.47.Aa
81.05.Mh
81.20.Fw
68.47.Gh
Opis:
In this study, it is aimed to develop $LiMn_2O_4$/MWCNT nanocomposite cathode materials by using different calcination temperatures (300, 500, 700°C). The aim of using MWCNTs in the active material is to overcome poor conductivity and to increase stability of the electrodes during charging and discharging. The nanocomposites were produced by sol-gel method, which allows producing very fine particle size of $LiMn_2O_4$. $LiMn_2O_4$ and $LiMn_2O_4$/MWCNT were uniformly coated on an Al-foil to obtain 500 μm thicknesses with a specific amount of binder and conducting agent. The surfaces of cathodes were coated with ZnO by using magnetron sputtering PVD with a thickness of 10 nm. Coin-type (CR2016) test cells were assembled, directly using the $LiMn_2O_4$/MWCNTs and surface coated $LiMn_2O_4$/MWCNTs as anode and a lithium metal foil as the counter electrode.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 331-334
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
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:
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:
Sol-Gel Synthesis of Nanostructured $SnO_2$ Thin Film Anodes for Li-Ion Batteries
Autorzy:
Köse, H.
Aydin, A.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1491372.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.61.Jc
82.45.Mp
81.20.Fw
82.47.Aa
68.55.jm
Opis:
Sol-gel technique was employed to prepare semiconductor tin dioxide $(SnO_2)$ thin films. Comparatively, it gives an advantage over other techniques by its low reaction temperature, easy process and low cost. The effect of glycerin addition on the structure and preventing crack formation has been investigated. Scanning electron microscopy, atomic force microscopy, and X-ray diffraction analysis were performed to characterize nanostructured films.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 227-229
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pulse Electrodeposition of Copper-Zinc Coatings from an Alkaline Bath
Autorzy:
Kartal, M.
Alp, A.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1031406.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Pq
82.47.-a
Opis:
A copper-zinc bath containing EDTA was used for deposition of multi-functional copper-zinc coatings. Copper substrates were used for pulse electrodeposition of copper-zinc coating. Microhardness and wear resistance of copper-zinc coatings has been studied. The films were characterized by scanning electron microscopy and X-ray diffraction. EDS and EDS-dot mapping were also performed to analyse the amount and the distribution of Cu-Zn atoms.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 801-803
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Temperature on Grain Size of $SnO_2$ Nanoparticles Synthesized by Sol-Gel Method
Autorzy:
Köse, H.
Aydin, A.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1218824.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Wx
81.20.Fw
81.20.Ev
Opis:
Tin dioxide nanoparticles were synthesized by sol-gel method and calcined at different temperatures in the range 350-750°C. The $SnO_2$ precursor solution was prepared from $SnCl_2$·$2H_2O$ (tin (II) chloride dihydrate), and chloride ions were removed from the solution before the sol-gel synthesis was applied. $SnO_2$ powders were characterized by thermal analyses, X-ray diffraction, field emission gun-scanning electron microscopy, and energy dispersive X-ray spectroscopy, and grain size of nanoparticles were determined by using the Debye-Scherrer formula.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 345-347
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical Conductivity, Viscosity and Thermal Properties of TEGDME-Based Composite Electrolytes for Lithium-Air Batteries
Autorzy:
Kartal, M.
Alp, A.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1398791.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
88.80.F-
88.80.ff
82.45.Gj
82.45.Wx
81.07.-b
Opis:
Some important properties of the electrolytes used in Li-air batteries were investigated. Electrolyte composed of a solution of 1 M LiPF₆ in tetra ethylene glycol dimethyl ether (TEGDME) was reinforced with SiO₂, Al₂O₃, poly(ethylene) oxide (PEO) and tris (pentafluorophenyl) borane (TPFPB) additives. The effects of these reinforcements on conductivity, viscosity and thermal stability were investigated. Electrical conductivity tests were carried out using a multiparameter meter. Viscosity tests were performed in a viscometer using tuning-fork vibration method. Thermal stability of the electrolytes was tested by both TG and DSC.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 816-818
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sol-Gel Synthesis of Nanocomposite $Cu-Li_4Ti_5O_{12}$ Structures for Ultrahigh Rate Li-Ion Batteries
Autorzy:
Erdas, A.
Ozcan, S.
Guler, M.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1401274.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.47.Aa
88.80.ff
Opis:
In this study, spinel $Li_4Ti_5O_{12}$ materials were successfully synthesized by a simple and facile sol-gel process and electroless copper deposition techniques. The characteristics of the as-prepared $Li_4Ti_5O_{12}$ and $Cu-Li_4Ti_5O_{12}$ were examined by X-ray diffraction and scanning electronic microscopy, while the electrochemical performances including charge/discharge and rate performance tests were also investigated. $Cu-Li_4Ti_5O_{12}$ electrode demonstrated the superior initial discharge capacity and rate capability to $Li_4Ti_5O_{12}$ electrode, cycled between 1.0 and 2.5 V. The enhanced rate capability can be attributed to the higher $Li^{+}$ diffusivity and lower charge-transfer resistance due to the electroless deposition of copper. Moreover, when both electrodes discharged with 80 C state of discharge conditions, the reversible capacities were further increased ım70 mAh $g^{-1}$ with excellent cycling stability and almost no irreversible capability was observed during cycling.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1026-1028
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics Bronze/$Al_2O_3(Ni)$ Reinforcement Metal Matrix Composite Produced by Current Activated Sintering
Autorzy:
Uysal, M.
Karslioğlu, R.
Akbulut, H.
Alp, A.
Powiązania:
https://bibliotekanauki.pl/articles/1399704.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Ni
81.20.Ev
81.40.Pq
Opis:
In this study, a bronze matrix (90 wt% Cu + 10 wt% Sn) was reinforced with $Al_2O_3$ particles using mechanical alloying and then produced by a subsequent rapid current sintering technique. The mechanically ball milled bronze powders were reinforced with electroless Ni coated 20 vol.% $Al_2O_3$ particles with three different particle sizes of 90, 70, and 50 μm. Microhardness testing, and scanning electron microscopy were used for the structural characterization of the composites. The tribological behavior of the resultant composites was tested by the ball-on-disk method at 1.0 N applied load with 0.3 m/s sliding speed for determination the wear loss and friction coefficient features against a counterface steel ball.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 235-237
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Preparation of Core-Shell $Al_2O_3//Cu$ Composite Powders by Electroless Plating in the Alkaline Solution
Autorzy:
Uysal, M.
Karslioğlu, R.
Alp, A.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1399707.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Hk
Opis:
In this study, Cu-coated $Al_2O_3$ composite powders were synthesized by using electroless plating method. The influence of the plating bath composition and ceramic powder concentration on the Cu plating was characterized by scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction techniques. The results showed that the electroless bath composition plays an important role for the structure of nano core-shell $Al_2O_3//Cu$ composite powders. The content of copper in the composite powders could be effectively controlled by adjusting the content of copper sulfate and formaldehyde in the plating solution. Furthermore, the pretreatment of the $Al_2O_3$ powders is also a key factor to form a uniform shell copper layer coating on $Al_2O_3$ particles.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 238-240
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reciprocating Wear Behavior of Ni-Co Alloys Produced by Pulse Current Electrodeposition
Autorzy:
Karslioğlu, R.
Uysal, M.
Alp, A.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1399969.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.bd
82.45.Aa
Opis:
In the present work, Ni-Co alloy coatings were prepared from a modified Watt type electrolyte by direct current. For this purpose, current density was investigated for optimization to obtain high quality coatings on the steel copper substrates. The depositions were controlled to obtain specific thickness (between 50 and 200 μm). The characterization of the coatings was investigated by scanning electron microscopy and X-ray diffraction facilities. The hardness of the resultant coatings was also measured. The effects of the current density on the tribological properties of Ni-Co coatings were investigated. The results showed that although increasing current density showed increasing coating thickness, the wear resistance of the Ni-Co alloys was decreased due to Co depletion in the deposited layer.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 424-426
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Waste Toothbrush Fiber on Strength and Freezing–Thawing Behavior in High Plasticity Clay
Autorzy:
Isik, Fatih
Akbulut, R. Kagan
Zaimoglu, A. Sahin
Powiązania:
https://bibliotekanauki.pl/articles/1845156.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
waste material
polypropylene fiber
toothbrush bristle
freezing–thawing
unconfined compression test
reinforced clay
Opis:
The use of waste materials in civil engineering applications has gained importance nowadays. Consuming limited natural resources and increasing waste disposal costs have led researchers to evaluate waste materials for different geotechnical applications. In this respect, some waste materials are used as reinforcement in soils to improve their engineering properties. The main objective of this paper was to investigate the usability of waste polypropylene fiber as a reinforcement material in high plasticity fine-grained soils. For this purpose, waste toothbrush bristle (WTB) was used as a polypropylene fiber reinforcement material and added to fine-grained soil at ratios of 0.2%, 0.4%, 0.6% and 0.8% by dry total weight. The effect of WTB on freezing–thawing behavior and unconfined compression strength of unreinforced and reinforced clayey soil was evaluated. The results indicated that addition of WTB to high plasticity clay improved its behavior against freezing–thawing. Also, undrained shear strength increases with respect to increment in WTB ratio.
Źródło:
Studia Geotechnica et Mechanica; 2021, 43, 1; 15--21
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tribological Behavior of Copper/MWCNT Nanocomposites Produced by Pulse Electrodeposition
Autorzy:
Gül, H.
Uysal, M.
Akbulut, H.
Alp, A.
Powiązania:
https://bibliotekanauki.pl/articles/1181744.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Pq
78.67.Sc
81.40.Pq
61.48.De
Opis:
Copper coatings containing well-distributed multiwalled carbon nanotubes were obtained by pulse electrodeposition in acidic sulfate bath in order to improve the microhardness and wear resistance of coatings. Multiwalled carbon nanotubes concentration was determined as the most significant factor for the incorporation of multiwalled carbon nanotubes in copper based electrolyte. The amount of embedded multiwalled carbon nanotubes and the microhardness of nanocomposites were found to increase with the increase of multiwalled carbon nanotubes in the electrolyte. The tribological properties of nanocomposites deposited by pulse electrocodeposition technique were studied by reciprocating ball on-disk method. The characterization of the coatings was investigated by scanning electron microscopy and X-ray diffraction facilities. The experimental results indicated that the wear resistance of copper composite is superior to that of pure copper. The friction coefficient and wear rates decreased with the increase in the concentration of multiwalled carbon nanotubes in the electrolyte.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 254-256
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:
Electrochemical Performance of Pulse Electrodeposited Sn-Ni/MWCNT Composite Anode for Lithium-Ion Batteries
Autorzy:
Uysal, M.
Görmüş, H.
Karslıoğlu, R.
Alp, A.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1218848.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Pq
82.47.Aa
81.05.Mh
Opis:
Grain size, and MWCNT content in the electrolyte of nanocrystalline Sn-Ni/MWCNT composite deposits produced from a solution containing nickel chloride and tin chloride at constant electrodeposition conditions (pulse on-time $T_{on}$ at 2.5 ms and pulse off-time $T_{off}$ at 7.5 ms) but with different peak current densities were investigated. The structure of the electroplated thin film Sn-Ni/MWCNTs composite electrode is investigated by X-ray diffraction, scanning electron microscopy. Galvanostatic charge/discharge measurements were performed in the assembled CR2016 cells designed by using anode composite material produced by pulse electro co-deposition. These cells discharge capacities were cyclically tested by a battery tester at a constant current in voltage range between 0.02 and 1.5 V. The electrochemical results showed that the increase in the discharge capacity of the assembled cell was produced when compared with conventionally used graphite lithium-ion batteries.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 353-356
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 18

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