Temat: 78.67.Sc - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Positron Annihilation Studies of Mesoporous Iron-Molybdenum Modified MCM-41 Silica
Autorzy:: Surowiec, Z.
Wiertel, M.
Gac, W.
Budzyński, M.
Tematy:: 34.80.Lx
78.67.Bf
78.70.Bj
62.23.Pq
78.67.Sc; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1339204.pdf Link otwiera się w nowym oknie
Opis:: Iron-molybdenum modified MCM-41 mesoporous materials were obtained by the application of direct hydrothermal method. An incorporation of iron and molybdenum ions in the synthesis stage led to structural changes of the MCM-41 support. With an increasing metals content, cylindrical pores of silica are destroyed. X-ray diffraction investigations indicated that both iron and molybdenum ions were first embedded in the silica walls and then formed highly dispersed species in the pores. The porous structure of the studied samples was examined by means of $N_2$ adsorption/desorption and PALS methods. The longest-lived o-Ps lifetime component remains constant but its intensity monotonically decreases, except for the sample with the highest metals content. These results indicate that an effect of o-Ps formation inhibition occurs.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Tribological Behavior of Copper/MWCNT Nanocomposites Produced by Pulse Electrodeposition
Autorzy:: Gül, H.
Uysal, M.
Akbulut, H.
Alp, A.
Tematy:: 81.15.Pq
78.67.Sc
81.40.Pq
61.48.De; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1181744.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Cyclic Performance Tests of Si/MWCNT Composite Lithium Ion Battery Anodes at Different Temperatures
Autorzy:: Tocoglu, U.
Cevher, O.
Akbulut, H.
Tematy:: 77.55.df
81.15.Cd
82.47.Aa
78.67.Sc
61.48.De; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1192560.pdf Link otwiera się w nowym oknie
Opis:: In this study silicon-multi walled carbon nanotube (Si-MWCNT) lithium ion battery anodes were produced and their electrochemical galvanostatic charge/discharge tests were conducted at various (25°C, 35°C, 50°C) temperatures to determine the cyclic behaviors of anode at different temperatures. Anodes were produced via vacuum filtration and DC magnetron sputtering technique. Silicon was sputtered onto buckypapers to form composite structure of anodes. SEM analysis was conducted to determine morphology of buckypapers and Si-MWCNT composite anodes. Structural and phase analyses were conducted via X-ray diffraction and Raman Spectroscopy technique. CR2016 coin cells were assembled for electrochemical tests. Cyclic voltammetry test were carried out to determine the reversibility of reactions between anodes and reference electrode between 0.01-2.0 V potential window. Galvanostatic charge/discharge tests were performed to determine cycle performance of anodes at different temperatures.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Tin/Tinoxide $(Sn//SnO_2)$ Nanocomposites Thin Films as Negative-Electrode Materials for Li-Ion Batteries
Autorzy:: Alaf, M.
Gultekin, D.
Akbulut, H.
Tematy:: 64.70.fm
73.61.At
81.16.Pr
82.47.Aa
78.67.Sc; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1399828.pdf Link otwiera się w nowym oknie
Opis:: In this study, tin/tinoxide $(Sn//SnO_2)$ nanocomposites thin films were produced by thermal evaporation and plasma oxidation as anode materials for Li-ion batteries. To produce $Sn//SnO_2$ thin films, pure metallic tin (Sn) was thermally evaporated on the stainless steel substrates in argon atmosphere. The Sn films were subjected to plasma oxidation process at oxygen/argon gas mixture. Three different plasma oxidation times (30, 45, and 60 min) were used to investigate oxidation kinetics and physical and microstructural properties. The surface properties were studied by scanning electron microscopy and atomic force microscopy. For structural analysis, X-ray diffraction measurements were carried out. $Sn//SnO_2$ coated stainless steel substrates were used as the working electrode in coin-type (CR2016) test cells. The energy storage capacity $Sn//SnO_2$ electrodes were determined depending on the oxidation time and $Sn:SnO_2$ ratio.
Dostawca treści:: Biblioteka Nauki

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