The Experts below are selected from a list of 5712 Experts worldwide ranked by ideXlab platform
Dmytro Rafalskyi - One of the best experts on this subject based on the ideXlab platform.
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Electron-less negative Ion extractIon from Ion-Ion plasmas
Applied Physics Letters, 2015Co-Authors: Dmytro Rafalskyi, Ane AaneslandAbstract:This paper presents experimental results showing that continuous negative Ion extractIon, without co-extracted electrons, is possible from highly electronegative SF6 Ion-Ion plasma at low gas pressure (1 mTorr). The ratio between the negative Ion and electron densities is more than 3000 in the vicinity of the two-grid extractIon and acceleratIon system. The measurements are conducted by both magnetized and non-magnetized energy analyzers attached to the external grid. With these two analyzers, we show that the extracted negative Ion flux is almost electron-free and has the same magnitude as the positive Ion flux extracted and accelerated when the grids are biased oppositely. The results presented here can be used for validatIon of numerical and analytical models of Ion extractIon from Ion-Ion plasma.
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Influence of Ion-beam plasma on Ion extractIon efficiency in a single-grid Ion source
The European Physical Journal D, 2011Co-Authors: S. V. Dudin, Dmytro RafalskyiAbstract:The influence of Ion-beam plasma on Ion extractIon efficiency in a single-grid ICP Ion source is researched. The single-grid Ion source is considered as a system with two plasmas, Ion-beam plasma and the source plasma, separated by an extractIon grid. Results of experimental measurements of the potentials of the two plasmas and the Ion beam current dependence on these potentials are presented. It is shown that the Ion extractIon efficiency depends equally on both the acceleratIon potential and on the potential of the Ion-beam plasma. The obtained results demonstrate the key role of the Ion-beam plasma in the Ion source operatIon, which is important in technological applicatIons and space thrusters.
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On the hysteresis at Ion extractIon in the single-grid Ion source
Applied Physics Letters, 2010Co-Authors: Dmytro Rafalskyi, S. V. DudinAbstract:The Ion extractIon in the single-grid Ion source with a woven extractIon grid is researched. It has been found experimentally that the extractIon can occur in “low current” and “high current” modes with stepwise hysteretic transitIons between them. The assumptIon has been made that the existence of the two extractIon regimes can be explained by the existence of two kinds of the space charge sheaths near the grid wires. This assumptIon is confirmed by the estimatIons of the sheath depth for the cylindrical and plane geometries.
Isamu Uchida - One of the best experts on this subject based on the ideXlab platform.
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In Situ ObservatIon of LiNiO2 Single‐Particle Fracture during Li ‐ Ion ExtractIon and InsertIon
Electrochemical and Solid-State Letters, 1999Co-Authors: Kaoru Dokko, Matsuhiko Nishizawa, Soichi Horikoshi, Takashi Itoh, Mohamed Mohamedi, Isamu UchidaAbstract:Electrochemical lithium‐Ion extractIon/insertIon properties of single particles were investigated by attaching a filament microelectrode to the particle in carbonate + propylene carbonate electrolyte. High‐resolutIon cyclic voltammograms and galvanostatic chronopotentiograms were recorded. In additIon, we observed in situ particle fracture during charge‐discharge using an optical microscope equipped with a charge‐coupled device camera. We found that the particle fractures when it is polarized above vs. . This phenomenon was explained by the change in crystal parameters expected to occur for in . ©2000 The Electrochemical Society
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in situ observatIon of linio2 single particle fracture during li Ion extractIon and insertIon
Electrochemical and Solid State Letters, 1999Co-Authors: Kaoru Dokko, Matsuhiko Nishizawa, Soichi Horikoshi, Takashi Itoh, Mohamed Mohamedi, Isamu UchidaAbstract:Electrochemical lithium‐Ion extractIon/insertIon properties of single particles were investigated by attaching a filament microelectrode to the particle in carbonate + propylene carbonate electrolyte. High‐resolutIon cyclic voltammograms and galvanostatic chronopotentiograms were recorded. In additIon, we observed in situ particle fracture during charge‐discharge using an optical microscope equipped with a charge‐coupled device camera. We found that the particle fractures when it is polarized above vs. . This phenomenon was explained by the change in crystal parameters expected to occur for in . ©2000 The Electrochemical Society
S. V. Dudin - One of the best experts on this subject based on the ideXlab platform.
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Influence of Ion-beam plasma on Ion extractIon efficiency in a single-grid Ion source
The European Physical Journal D, 2011Co-Authors: S. V. Dudin, Dmytro RafalskyiAbstract:The influence of Ion-beam plasma on Ion extractIon efficiency in a single-grid ICP Ion source is researched. The single-grid Ion source is considered as a system with two plasmas, Ion-beam plasma and the source plasma, separated by an extractIon grid. Results of experimental measurements of the potentials of the two plasmas and the Ion beam current dependence on these potentials are presented. It is shown that the Ion extractIon efficiency depends equally on both the acceleratIon potential and on the potential of the Ion-beam plasma. The obtained results demonstrate the key role of the Ion-beam plasma in the Ion source operatIon, which is important in technological applicatIons and space thrusters.
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On the hysteresis at Ion extractIon in the single-grid Ion source
Applied Physics Letters, 2010Co-Authors: Dmytro Rafalskyi, S. V. DudinAbstract:The Ion extractIon in the single-grid Ion source with a woven extractIon grid is researched. It has been found experimentally that the extractIon can occur in “low current” and “high current” modes with stepwise hysteretic transitIons between them. The assumptIon has been made that the existence of the two extractIon regimes can be explained by the existence of two kinds of the space charge sheaths near the grid wires. This assumptIon is confirmed by the estimatIons of the sheath depth for the cylindrical and plane geometries.
Kaoru Dokko - One of the best experts on this subject based on the ideXlab platform.
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In Situ ObservatIon of LiNiO2 Single‐Particle Fracture during Li ‐ Ion ExtractIon and InsertIon
Electrochemical and Solid-State Letters, 1999Co-Authors: Kaoru Dokko, Matsuhiko Nishizawa, Soichi Horikoshi, Takashi Itoh, Mohamed Mohamedi, Isamu UchidaAbstract:Electrochemical lithium‐Ion extractIon/insertIon properties of single particles were investigated by attaching a filament microelectrode to the particle in carbonate + propylene carbonate electrolyte. High‐resolutIon cyclic voltammograms and galvanostatic chronopotentiograms were recorded. In additIon, we observed in situ particle fracture during charge‐discharge using an optical microscope equipped with a charge‐coupled device camera. We found that the particle fractures when it is polarized above vs. . This phenomenon was explained by the change in crystal parameters expected to occur for in . ©2000 The Electrochemical Society
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in situ observatIon of linio2 single particle fracture during li Ion extractIon and insertIon
Electrochemical and Solid State Letters, 1999Co-Authors: Kaoru Dokko, Matsuhiko Nishizawa, Soichi Horikoshi, Takashi Itoh, Mohamed Mohamedi, Isamu UchidaAbstract:Electrochemical lithium‐Ion extractIon/insertIon properties of single particles were investigated by attaching a filament microelectrode to the particle in carbonate + propylene carbonate electrolyte. High‐resolutIon cyclic voltammograms and galvanostatic chronopotentiograms were recorded. In additIon, we observed in situ particle fracture during charge‐discharge using an optical microscope equipped with a charge‐coupled device camera. We found that the particle fractures when it is polarized above vs. . This phenomenon was explained by the change in crystal parameters expected to occur for in . ©2000 The Electrochemical Society
Bruno Ameduri - One of the best experts on this subject based on the ideXlab platform.
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Solid-Liquid Europium Ion ExtractIon via Phosphonic Acid-FunctIonalized Polyvinylidene Fluoride Siloxanes.
Polymers, 2020Co-Authors: Mohammad Wehbi, Ahmad Mehdi, Ali Alaaeddine, Nada Jaber, Bruno AmeduriAbstract:Novel triethoxysilane and dimethyl phosphonate functIonal vinylidene fluoride (VDF)-containing terpolymers, for potential applicatIons in Eu Ion extractIon from water, were produced by conventIonal radical terpolymerizatIon of VDF with vinyltriethoxylsilane (VTEOS) and vinyldimethylphosphonate (VDMP). Although initial attempts for the copolymerizatIon of VTEOS and VDMP failed, the successful terpolymerizatIon was initiated by peroxide to lead to multiple poly(VDF-ter-VDMP-ter-VTEOS) terpolymers, that had different molar percentages of VDF (70–90 mol.%), VTEOS (5–20 mol.%) and VDMP (10 mol.%) in 50–80% yields. The obtained terpolymers were characterized by 1H, 19F, 29Si and 31P NMR spectroscopies. The crosslinking of such resulting poly(VDF-ter-VDMP-ter-VTEOS) terpolymers was achieved by hydrolysis and condensatIon (sol–gel process) of the triethoxysilane groups in acidic media, to obtain a 3D network, which was analyzed by solid state 29Si and 31P NMR spectroscopies, TGA and DSC. The thermal stability of the terpolymers was moderately high (up to 300 °C under air), whereas they display a slight increase in their crystallinity-rate from 9.7% to 12.1% after crosslinking. Finally, the dimethyl phosphonate functIons were hydrolyzed into phosphonic acid successfully, and the europium Ion extractIon capacity of terpolymer was studied. The results demonstrated a very high removal capacity of Eu(III) Ions from water, up to a total removal at low concentratIons.
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Solid–Liquid Europium Ion ExtractIon via Phosphonic Acid-FunctIonalized Polyvinylidene Fluoride Siloxanes
Polymers, 2020Co-Authors: Mohammad Wehbi, Ahmad Mehdi, Ali Alaaeddine, Nada Jaber, Bruno AmeduriAbstract:Novel triethoxysilane and dimethyl phosphonate functIonal vinylidene fluoride (VDF)-containing terpolymers, for potential applicatIons in Eu Ion extractIon from water, were produced by conventIonal radical terpolymerizatIon of VDF with vinyltriethoxylsilane (VTEOS) and vinyldimethylphosphonate (VDMP). Although initial attempts for the copolymerizatIon of VTEOS and VDMP failed, the successful terpolymerizatIon was initiated by peroxide to lead to multiple poly(VDF-ter-VDMP-ter-VTEOS) terpolymers, that had different molar percentages of VDF (70-90 mol.%), VTEOS (5-20 mol.%) and VDMP (10 mol.%) in 50-80% yields. The obtained terpolymers were characterized by 1 H, 19 F, 29 Si and 31 P NMR spectroscopies. The crosslinking of such resulting poly(VDF-ter-VDMP-ter-VTEOS) terpolymers was achieved by hydrolysis and condensatIon (sol-gel process) of the triethoxysilane groups in acidic media, to obtain a 3D network, which was analyzed by solid state 29 Si and 31 P NMR spectroscopies, TGA and DSC. The thermal stability of the terpolymers was moderately high (up to 300 °C under air), whereas they display a slight increase in their crystallinity-rate from 9.7% to 12.1% after crosslinking. Finally, the dimethyl phosphonate functIons were hydrolyzed into phosphonic acid successfully, and the europium Ion extractIon capacity of terpolymer was studied. The results demonstrated a very high removal capacity of Eu(III) Ions from water, up to a total removal at low concentratIons.
