scholarly journals Understanding Interaction of Curcumin and Metal Ions on Electrode Surfaces Using EDXRF

2022 ◽  
pp. 154-156
Author(s):  
Daisy Joseph ◽  
Krishna Kumar ◽  
S Narayan
Keyword(s):  
Metal Ions ◽  
Electrode Surfaces

Reaction entropy measurements for transition-metal ions bound to Nafion-coated electrode surfaces

1986 ◽  
Vol 90 (6) ◽  
pp. 1002-1003 ◽  
Author(s):  
Charles M. Lieber ◽  
Michael H. Schmidt ◽  
Nathan S. Lewis
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Transition Metal Ions ◽  
Electrode Surfaces ◽  
Coated Electrode ◽  
Reaction Entropy

Understanding interaction of curcumin and metal ions on electrode surfaces using EDXRF

2018 ◽  
Author(s):  
Daisy Joseph ◽  
K. Krishna Kumar ◽  
S. Sriman Narayanan
Keyword(s):  
Metal Ions ◽  
Electrode Surfaces

Bacterial chemo-attractant properties of metal ions from dissolving electrode surfaces

1996 ◽  
Vol 403 (1-2) ◽  
pp. 39-45 ◽  
Author(s):  
Susana R. de Sánchez ◽  
David J. Schiffrin
Keyword(s):  
Metal Ions ◽  
Electrode Surfaces

scholarly journals Electrochemical modification of platinum and glassy carbon surfaces with pyridine layers and their use as complexing agents for copper (II) ions

2019 ◽  
Vol 17 (1) ◽  
pp. 722-727 ◽  
Author(s):  
Veton Haziri ◽  
Avni Berisha ◽  
Fetah I. Podvorica
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Glassy Carbon ◽  
Heavy Metal Ions ◽  
Square Wave Voltammetry ◽  
Square Wave ◽  
Electrode Surfaces ◽  
Wave Voltammetry ◽  
Wide Range ◽  
Carbon Surfaces

AbstractThe electrochemical grafting of the “in-situ” prepared diazopyridinium salt have permitted the attachment of pyridine moieties onto platinum and glassy carbon surfaces. The modification of the electrode surfaces is observed by a redox probe. The ability of the film for the complexation of copper (II) ions is demonstrated by square wave voltammetry. After 45 min accumulation of copper (II) ions onto the grafted electrode surfaces, the electrode signal obtained by square wave voltammetry measurement served to discriminate the adsorbed heavy metal ions. Such measurements showed that the grafted pyridine has the ability to display complexing behavior toward some heavy metal ions. DFT calculations support a strong binding of the pyridine moieties onto the Pt surface. The most favorable complexation mode of copper (II) ions as suggested from DFT is the bidentate complex. This strategy is vital in constructing a wide range of different electrochemical sensors.

HREM Study of electron-induced surface radiation damage in ReO3

1991 ◽  
Vol 49 ◽  
pp. 636-637
Author(s):  
R. Ai ◽  
H.-J. Fan ◽  
L. D. Marks
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Metal Oxides ◽  
Electron Irradiation ◽  
Transition Metal Oxides ◽  
Carbon Film ◽  
Transition Metal Ions ◽  
Surface Radiation ◽  
Valence Transition ◽  
Electron Microscopes

It has been known for a long time that electron irradiation induces damage in maximal valence transition metal oxides such as TiO2, V2O5, and WO3, of which transition metal ions have an empty d-shell. This type of damage is excited by electronic transition and can be explained by the Knoteck-Feibelman mechanism (K-F mechanism). Although the K-F mechanism predicts that no damage should occur in transition metal oxides of which the transition metal ions have a partially filled d-shell, namely submaximal valence transition metal oxides, our recent study on ReO3 shows that submaximal valence transition metal oxides undergo damage during electron irradiation.ReO3 has a nearly cubic structure and contains a single unit in its cell: a = 3.73 Å, and α = 89°34'. TEM specimens were prepared by depositing dry powders onto a holey carbon film supported on a copper grid. Specimens were examined in Hitachi H-9000 and UHV H-9000 electron microscopes both operated at 300 keV accelerating voltage. The electron beam flux was maintained at about 10 A/cm2 during the observation.

ELNES of Iron Compounds

1990 ◽  
Vol 48 (2) ◽  
pp. 28-29
Author(s):  
Hiroki Kurata ◽  
Kazuhiro Nagai ◽  
Seiji Isoda ◽  
Takashi Kobayashi
Keyword(s):  
Energy Loss ◽  
Metal Ions ◽  
Energy Resolution ◽  
Transition Metal Oxides ◽  
Local Symmetry ◽  
Iron Compounds ◽  
Fine Structures ◽  
Electron Energy Loss ◽  
Fe Ions ◽  
Electron Energy Loss Spectra

Electron energy loss spectra of transition metal oxides, which show various fine structures in inner shell edges, have been extensively studied. These structures and their positions are related to the oxidation state of metal ions. In this sence an influence of anions coordinated with the metal ions is very interesting. In the present work, we have investigated the energy loss near-edge structures (ELNES) of some iron compounds, i.e. oxides, chlorides, fluorides and potassium cyanides. In these compounds, Fe ions (Fe2+ or Fe3+) are octahedrally surrounded by six ligand anions and this means that the local symmetry around each iron is almost isotropic.EELS spectra were obtained using a JEM-2000FX with a Gatan Model-666 PEELS. The energy resolution was about leV which was mainly due to the energy spread of LaB6 -filament. The threshole energies of each edges were measured using a voltage scan module which was calibrated by setting the Ni L3 peak in NiO to an energy value of 853 eV.

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