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1
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Electrical Conductivity, Viscosity and Thermal Properties of TEGDME-Based Composite Electrolytes for Lithium-Air Batteries

100%
Kartal M., Alp A., Akbulut H.
Acta Physica Polonica A
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2016
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vol. 129
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issue 4
816-818
EN
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.
2
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Characteristics Bronze/Al_2O_3(Ni) Reinforcement Metal Matrix Composite Produced by Current Activated Sintering

100%
Uysal M., Karslioğlu R., Akbulut H., Alp A.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
235-237
EN
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.
3
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The Preparation of Core-Shell Al_2O_3/Cu Composite Powders by Electroless Plating in the Alkaline Solution

100%
Uysal M., Karslioğlu R., Alp A., Akbulut H.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
238-240
EN
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.
4
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Reciprocating Wear Behavior of Ni-Co Alloys Produced by Pulse Current Electrodeposition

100%
Karslioğlu R., Uysal M., Alp A., Akbulut H.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
424-426
EN
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.
5
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Tribological Behavior of Copper/MWCNT Nanocomposites Produced by Pulse Electrodeposition

100%
Gül H., Uysal M., Akbulut H., Alp A.
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vol. 125
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issue 2
254-256
EN
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.
6
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Pulse Electrodeposition of Copper-Zinc Coatings from an Alkaline Bath

100%
Kartal M., Alp A., Akbulut H.
Acta Physica Polonica A
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2017
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vol. 132
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issue 3
801-803
EN
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.
7
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Electrochemical Performance of Pulse Electrodeposited Sn-Ni/MWCNT Composite Anode for Lithium-Ion Batteries

88%
Uysal M., Görmüş H., Karslıoğlu R., Alp A., Akbulut H.
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vol. 125
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issue 2
353-356
EN
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.
8
Content available remote

The Effect of Inorganic Nano Powder Additives in TEGDME for Lithium Air Batteries

88%
Kartal M., Uysal M., Cetinkaya T., Alp A., Akbulut H.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1016-1018
EN
SiO₂ and Al₂O₃ nano fillers were added to an electrolyte composed of a solution 1 M LiPF₆ in tetra ethylene glycol dimethyl ether (TEGDME) and the effects of these nano powders on capacity and cycling performances were investigated. Galvanostatic charge/discharge (GC) measurements were performed in the assembled Li-air cells by using the nanocomposite electrolytes. The discharge capacities of these cells were cyclically tested by a battery tester at a constant current in the voltage range between 2.15 V and 4.25 V. Discharge products of nanocomposite electrolytes were characterized by SEM and XRD spectroscopies. The electrochemical results demonstrated that Al₂O₃ reinforced electrolyte showed higher discharge capacity and cyclability than those of SiO₂ reinforced electrolyte.
9
Content available remote

The Electrochemical Properties of Cu Coated LiCr_{0.2}V_{0.2}Mn_{0.6}O₂ Nanocomposites for High Rate Li-Ion Batteries

76%
Algul H., Erdas A., Tokur M., Guler M., Akbulut H., Alp A.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1038-1041
EN
Several reported problems of commercial LiCoO₂ electrode materials such as high cost, toxicity, limited rate capability and safety concerns are still remain to be problematic to develop the lithium ion consumer electronics such as mobile phones, tablets and notebook computers. In this study, an alternative nanocomposite electrode material based on LiCr_{0.2}V_{0.2}Mn_{0.6}O₂ and copper coated one were produced via a facile sol-gel method and electroless Cu deposition techniques. The resulting samples were characterized by X-ray diffraction (Rigaku DMax 2200 diffractometer) using a monochromatized Cu-Kα source (λ=1.5406 Å) and 2θ scan range from 10° to 80° with a speed of 1° min^{-1}. The scanning electron microscope (SEM) was used in order to characterize the morphology of the active materials. The as-synthesized Cu/LiCr_{0.2}V_{0.2}Mn_{0.6}O₂ composite cathode exhibits a stable capacity on cycling and good rate capability after 50 cycles and total capacity retention of 93% is obtained. The unique 2D structure of the composite cathode material, its good electrochemical performances and its relatively low cost comparing to LiCoO₂, make this material very promising for applications.
10
Content available remote

Preparation and Characterization of Copper Powders with Sn Coating by the Electroless Plating

64%
Uysal M., Cetinkaya T., Gul H., Kartal M., Algul H., Tokur M., Alp A., Akbulut H.
Acta Physica Polonica A
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2015
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vol. 127
|
issue 4
1106-1108
EN
In this work, Sn-Cu composite powders were produced using an electroless process. The tin content on the surface of copper powders was varied by using different concentrations of SnSO₄ in the plating bath. The surface morphology of the produced Sn-Cu composite powders was characterized using scanning electron microscopy (SEM). Energy dispersive spectroscopy (EDS) was used to determine the elemental surface composition of the composites. X-ray diffraction (XRD) analysis was performed to investigate the structure of the Sn-Cu composite powders. The electrochemical performance of Sn-Cu nanocomposites was studied by charge/discharge tests.
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