The Experts below are selected from a list of 270 Experts worldwide ranked by ideXlab platform
Eckhard Spohr - One of the best experts on this subject based on the ideXlab platform.
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Partial Charge Transfer of the Iodide Ion near a Water/Metal Interface
The Journal of Physical Chemistry, 1994Co-Authors: Renat R. Nazmutdinov, Eckhard SpohrAbstract:We have studied theoretically the partial charge transfer (PCT) between a hydrated Iodide Ion and a neighboring platinum (100) surface by an approach that is a combinatIon of quantum chemical cluster calculatIons, the Newns-Anderson theory of chemisorptIon, and molecular dynamics simulatIons. The PCT from the bare Ion has been calculated from quantum chemical cluster calculatIons as a functIon of the distance from the metal surface. The hydratIon energy of the undischarged Iodide Ion has been calculated by molecular dynamics simulatIons at different Ion-metal distances. HydratIon and the surface dipole layer lead to a shift in the highest occupied energy level of the adsorbate, which results in a significant reductIon of the PCT compared with the situatIon in vacuum. The equilibrium hydratIon energy of the Ion as a functIon of its charge and as a functIon of Ion-metal distance was calculated on the basis of a Born-like approximatIon. The hydratIon energy of the partially discharged Ion is combined with the direct Ion-surface interactIons and the desorptIon energy of water molecules to produce the total energy profile for Iodide adsorptIon. Two minima separated by a small barrier are observed, one corresponding to a contact-adsorbed, partially discharged, and partially dehydrated Ion and the other one corresponding to a fully hydrated Iodide Ion at larger distances.
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A computer simulatIon study of Iodide Ion solvatIon in the vicinity of a liquid water/metal interface
Chemical Physics Letters, 1993Co-Authors: Eckhard SpohrAbstract:Abstract The density distributIon of an Iodide Ion in the vicinity of a water/platinum interface has been calculated by classical molecular dynamics simulatIons based on pairwise additive interactIon potentials. The approach of the Iodide Ion to the surface is strongly sterically hindered by the layer of adsorbed water molecules. Based upon the interactIon potentials used in the present study, this steric effect is overcompensated by the direct Ion-surface interactIon, leading to a significant free energy gain upon contact adsorptIon. This result is consistent with recent scanning tunnelling microscopy investigatIons of the iodine adsorptIon on platinum surfaces from aqueous solutIon.
Zu Mao - One of the best experts on this subject based on the ideXlab platform.
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The relatIonship between Iodide Ion and vascular endothelial growth factor together with its receptor in vascular endothelial cell proliferatIon
Journal of Interventional Radiology, 2013Co-Authors: Zu MaoAbstract:Objective To explore the relatIonship between Iodide Ion and vascular endothelial growth factor(VEGF) as well as its receptor in vascular endothelial cells(VEC) proliferatIon.Methods(1) The detectIon of the proliferatIon rate of vascular endothelial cell after it reacted to Iodide Ion and VEGF inhibitor was performed by using CCK-8 kit.(2) The detectIon of the influence of Iodide Ion on the phosphorylatIon of VEGFR-2 was carried out by using Western Blot technique.Results(1) The VEGF inhibitor could not suppress the proliferatIon of vascular endothelial cell in concentratIon of 300 μg/L of Iodide Ion(P 0.05).(2) A certain concentratIon of Iodide Ion could stimulate the phosphorylatIon of VEGF-2(Tyr1214)(P 0.05).(3) Iodide Ion could not affect the phosphorylatIon of VEGF-2(Tyr1175 and Tyr951 loci).ConclusIon(1) Iodide Ion can stimulate the proliferatIon of VEC,and it does not depended on the stimulatIon of membrane receptor from VEGF.Therefore,Iodide Ion can be regarded as an independent element in stimulating the proliferatIon of vascular endothelial cell.(2) The Iodide Ion can mediate the migratIon of vascular endothelial cell through stimulating the phosphorylatIon of VEGF-2(Tyr1214).(3) The Iodide Ion has no effect on the phosphorylatIon of VEGFR-2(Tyr1175).The stimulatIon of Iodide Ion to the proliferatIon of VEC is accomplished not by way of acting on the membrane receptor.
Hiriyakkanavar Junjappa - One of the best experts on this subject based on the ideXlab platform.
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a new route to spiropyrrolidinyl oxindole alkaloids via Iodide Ion induced rearrangement of n aziridinomethylthio methylene 2 oxindoles
ChemInform, 2002Co-Authors: U Syam K Kumar, Hiriyakkanavar Ila, Hiriyakkanavar JunjappaAbstract:A new approach for the synthesis of spiropyrrolidinyloxindole alkaloids, i.e. coerulescine (4) and horsfiline (5) has been developed via Iodide Ion induced rearrangement of [(N-aziridinomethylthio)methylene]oxindoles 2 to the respective spiropyrroline-2-oxindole derivatives 3 and their subsequent one-pot reductive dethiomethylatIon-N-methylatIon. [reactIon: see text]
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A new route to spiropyrrolidinyl-oxindole alkaloids via Iodide Ion induced rearrangement of [(N-aziridinomethylthio)methylene]-2-oxindoles.
Organic letters, 2001Co-Authors: U. K. Syam Kumar, Hiriyakkanavar Ila, Hiriyakkanavar JunjappaAbstract:A new approach for the synthesis of spiropyrrolidinyloxindole alkaloids, i.e. coerulescine (4) and horsfiline (5) has been developed via Iodide Ion induced rearrangement of [(N-aziridinomethylthio)methylene]oxindoles 2 to the respective spiropyrroline-2-oxindole derivatives 3 and their subsequent one-pot reductive dethiomethylatIon−N-methylatIon.
Chockalingam Karunakaran - One of the best experts on this subject based on the ideXlab platform.
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Solar-driven electrochemically assisted semiconductor-catalyzed Iodide Ion oxidatIon. Enhanced efficiency by oxide mixtures
Open Chemistry, 2009Co-Authors: Chockalingam Karunakaran, P. AnilkumarAbstract:OxidatIon of Iodide Ion from an air-saturated solutIon under natural sunlight (900±50 W m−2) on the surfaces of TiO2, ZnO, Fe2O3, MoO3 and CeO2 enhances by 6 to 12-fold on applicatIon of a cathodic bias of −0.2 to −0.3 V (vs NHE) to the semiconductors; light, the semiconductor and dissolved oxygen are essential for iodine generatIon. The semiconductors under an anodic bias of +0.2 to +0.3 V (vs NHE) fail to oxidize Iodide Ion from air-saturated solutIon under sunlight. Under cathodic bias, semiconductor mixtures like TiO2-ZnO, TiO2-Fe2O3 and ZnO-Fe2O3 show enhanced photocatalytic activity, indicating improved charge separatIon in oxide mixtures. The mechanism of photocatalysis under cathodic bias is discussed.
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PhotooxidatIon of Iodide Ion on immobilized semiconductor powders
Solar Energy Materials and Solar Cells, 2008Co-Authors: Chockalingam Karunakaran, P. AnilkumarAbstract:Abstract MoO3 particles immobilized on an organic polymer, fixed on a glass plate, effectively catalyze the oxidatIon of Iodide Ion in air-saturated solutIon under illuminatIon at 365 nm; the catalytic efficiency is higher than that of ZnO and anatase TiO2. Immobilized ZrO2, Fe2O3, Al2O3, Bi2O3, Y2O3, CeO2 and Nd2O3 particles also photocatalyze the oxidatIon. Except ZnO, all the listed metal oxides show sustainable photocatalytic activity at least up to 2 h; ZnO photocatalysis slackens after half-an-hour. Immobilized particulate CuO, ZnS, CdO, CdS, PbO and Sb2O3 fail to catalyze the photooxidatIon of Iodide Ion whereas SnO2 oxidizes Iodide Ion in dark itself; V2O5 dissolves. All the stated photocatalysis depend linearly on Iodide Ion concentratIon and enhance with the photon flux. The mechanistic detail of the photocatalysis is presented.
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semiconductor catalyzed solar photooxidatIon of Iodide Ion
Journal of Molecular Catalysis A-chemical, 2007Co-Authors: Chockalingam Karunakaran, P. AnilkumarAbstract:Abstract With natural sunlight TiO 2 (anatase), ZrO 2 , MoO 3 , Fe 2 O 3 , ZnO, CeO 2 and Al 2 O 3 microparticles photocatalyze the oxidatIon of Iodide Ion but CuO, ZnS, CdO, CdS, HgO, PbO, Sb 2 O 3 and Bi 2 O 3 microparticles do not. The photocatalysis is not slowed down at least up to 120 min with ZrO 2 , MoO 3 , Fe 2 O 3 , CeO 2 and Al 2 O 3 whereas it is 45 min with TiO 2 and 30 min with ZnO. The iodine generatIon depends on [I − ], surface area and pH and is enhanced by the additIon of ethanol. The catalysts show sustainable photocatalysis. Nanoparticles exhibit higher photocatalytic activities than microparticles. The catalytic efficiencies are of the order: Fe 2 O 3 > MoO 3 > TiO 2 > CeO 2 > ZnO > ZrO 2 > Al 2 O 3 .
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PhotooxidatIon of Iodide Ion on some semiconductor and non-semiconductor surfaces
Catalysis Communications, 2004Co-Authors: Chockalingam Karunakaran, S. Senthilvelan, S. Karuthapandian, Kaliyaperumal BalaramanAbstract:Abstract In 80% aqueous ethanol, TiO2 (anatase), ZrO2, ZnO, V2O5, Fe2O3 and Al2O3 photocatalyze the oxidatIon of Iodide Ion but CdO and CdS do not; the wavelength of illuminatIon is 365 nm. However, Fe2O3 fails to bring in a sustainable photocatalysis in 60% aqueous ethanol. The photooxidatIon of Iodide Ion on TiO2, ZrO2, ZnO, V2O5 and Al2O3 in 60% aqueous ethanol was studied as a functIon of [I−], amount of catalyst suspended, airflow rate, light intensity and solvent compositIon. The metal oxides examined show sustainable photocatalytic activity. Iodine formatIon is larger with illuminatIon at 254 nm than at 365 nm. The mechanisms of photocatalysis on semiconductor and non-semiconductor surfaces have been discussed. Photocatalytic generatIon of iodine has been analyzed using a kinetic model. The photocatalytic efficiencies are of the order V2O5 > TiO2 > ZrO2 > ZnO > Al2O3 and V2O5 > TiO2 > ZrO2 > ZnO=Fe2O3 > Al2O3 in 60% and 80% aqueous ethanol.
P. Anilkumar - One of the best experts on this subject based on the ideXlab platform.
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Solar-driven electrochemically assisted semiconductor-catalyzed Iodide Ion oxidatIon. Enhanced efficiency by oxide mixtures
Open Chemistry, 2009Co-Authors: Chockalingam Karunakaran, P. AnilkumarAbstract:OxidatIon of Iodide Ion from an air-saturated solutIon under natural sunlight (900±50 W m−2) on the surfaces of TiO2, ZnO, Fe2O3, MoO3 and CeO2 enhances by 6 to 12-fold on applicatIon of a cathodic bias of −0.2 to −0.3 V (vs NHE) to the semiconductors; light, the semiconductor and dissolved oxygen are essential for iodine generatIon. The semiconductors under an anodic bias of +0.2 to +0.3 V (vs NHE) fail to oxidize Iodide Ion from air-saturated solutIon under sunlight. Under cathodic bias, semiconductor mixtures like TiO2-ZnO, TiO2-Fe2O3 and ZnO-Fe2O3 show enhanced photocatalytic activity, indicating improved charge separatIon in oxide mixtures. The mechanism of photocatalysis under cathodic bias is discussed.
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PhotooxidatIon of Iodide Ion on immobilized semiconductor powders
Solar Energy Materials and Solar Cells, 2008Co-Authors: Chockalingam Karunakaran, P. AnilkumarAbstract:Abstract MoO3 particles immobilized on an organic polymer, fixed on a glass plate, effectively catalyze the oxidatIon of Iodide Ion in air-saturated solutIon under illuminatIon at 365 nm; the catalytic efficiency is higher than that of ZnO and anatase TiO2. Immobilized ZrO2, Fe2O3, Al2O3, Bi2O3, Y2O3, CeO2 and Nd2O3 particles also photocatalyze the oxidatIon. Except ZnO, all the listed metal oxides show sustainable photocatalytic activity at least up to 2 h; ZnO photocatalysis slackens after half-an-hour. Immobilized particulate CuO, ZnS, CdO, CdS, PbO and Sb2O3 fail to catalyze the photooxidatIon of Iodide Ion whereas SnO2 oxidizes Iodide Ion in dark itself; V2O5 dissolves. All the stated photocatalysis depend linearly on Iodide Ion concentratIon and enhance with the photon flux. The mechanistic detail of the photocatalysis is presented.
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semiconductor catalyzed solar photooxidatIon of Iodide Ion
Journal of Molecular Catalysis A-chemical, 2007Co-Authors: Chockalingam Karunakaran, P. AnilkumarAbstract:Abstract With natural sunlight TiO 2 (anatase), ZrO 2 , MoO 3 , Fe 2 O 3 , ZnO, CeO 2 and Al 2 O 3 microparticles photocatalyze the oxidatIon of Iodide Ion but CuO, ZnS, CdO, CdS, HgO, PbO, Sb 2 O 3 and Bi 2 O 3 microparticles do not. The photocatalysis is not slowed down at least up to 120 min with ZrO 2 , MoO 3 , Fe 2 O 3 , CeO 2 and Al 2 O 3 whereas it is 45 min with TiO 2 and 30 min with ZnO. The iodine generatIon depends on [I − ], surface area and pH and is enhanced by the additIon of ethanol. The catalysts show sustainable photocatalysis. Nanoparticles exhibit higher photocatalytic activities than microparticles. The catalytic efficiencies are of the order: Fe 2 O 3 > MoO 3 > TiO 2 > CeO 2 > ZnO > ZrO 2 > Al 2 O 3 .
