Electrochemical behavior of uranyl in anhydrous polar organic media

2017 ◽  
Vol 105 (7) ◽  
Author(s):  
Adam G. Burn ◽  
Kenneth L. Nash
Keyword(s):  
Redox Reactions ◽  
Aqueous Media ◽  
High Ionic Strength ◽  
Oxidation States ◽  
Organic Media ◽  
Chemical Behavior ◽  
Separation Systems ◽  
Weak Complexes ◽  
Fuel Reprocessing ◽  
Cation Complexes

AbstractWeak complexes between pentavalent and hexavalent actinyl cations have been reported to exist in acidic, non-complexing high ionic strength aqueous media. Such “cation-cation complexes” were first identified in the context of actinide-actinide redox reactions in acidic aqueous media relevant to solvent extraction-based separation systems, hence their characterization is of potential interest for advanced nuclear fuel reprocessing. This chemistry could be relevant to efforts to develop advanced actinide separations based on the upper oxidation states of americium, which are of current interest. In the present study, the chemical behavior of pentavalent uranyl was examined in non-aqueous, aprotic polar organic solvents (propylene carbonate and acetonitrile) to determine whether UO

A Stable Thin Film from Soluble Single-Walled Carbon Nanotubes on ITO

2011 ◽  
Vol 287-290 ◽  
pp. 2443-2446
Author(s):  
Su Min Wang ◽  
Qi Guan Wang ◽  
Jian Ping Li ◽  
Hiroshi Moriyama ◽  
Wei Xing Chen
Keyword(s):  
Carbon Nanotubes ◽  
Redox Reactions ◽  
Conductive Polymer ◽  
Stable State ◽  
Single Walled Carbon Nanotubes ◽  
Organic Media ◽  
Covalent Bonds ◽  
Single Walled Carbon ◽  
Reversible Redox ◽  
Walled Carbon Nanotubes

Thin films of single-walled carbon nanotubes (SWNTs) attached to an ITO surface (SAM–ITO) self-assembled in advance from 3-aminopropyltrimethoxysilane through amide covalent bonds were prepared. The SWNTs were safely obtained via a two-step process assisted by microwave radiation, which were soluble in aqueous and organic media. However, the CV behavior of SAM–ITO in acidic aqueous systems showed unexpected oxidation signals due to redox reactions involving the defects and sidewalls of soluble functionalized SWNTs. It was found that, after a conductive polymer of polyaniline was chemically incorporated onto the surface of the SWNTs by using electropolymerization method, the CV data showed a single reversible redox couple, which indicated a more stable state.

Redox reactions in non-aqueous media: Determination of organic isothiocyanates alone, in formulations and in important mixtures

Talanta ◽  
1991 ◽  
Vol 38 (2) ◽  
pp. 217-221 ◽  
Author(s):  
B.C. Verma ◽  
S.B. Kalia ◽  
V.S. Jamwal ◽  
Sudhir Kumar ◽  
D.K. Sharma ◽  
...  
Keyword(s):  
Redox Reactions ◽  
Aqueous Media

THE ROLE OF OXYGEN IN YBa2Cu3O7−δ

1988 ◽  
Vol 02 (03n04) ◽  
pp. 379-391 ◽  
Author(s):  
JOHN B. GOODENOUGH ◽  
A. MANTHIRAM
Keyword(s):  
Oxygen Atom ◽  
Oxygen Partial Pressure ◽  
Basal Plane ◽  
Redox Reactions ◽  
Orthorhombic Phase ◽  
Near Neighbor ◽  
Oxidation States ◽  
Internal Electric Field ◽  
Phase 3

Five observations concerning the role of oxygen in the high-Tc superconductors YBa 2 Cu 3 O 7−δ are emphasized: (1) An internal electric field parallel to the c-axis constrains the redox reactions associated with the intercalation/disintercalation of oxygen primarily to the [ CuO 3−δ]3− layers located between Ba 2+ layers. (2) Intercalation of O 2− into the tetragonal YBa 2 Cu 3 O 6 phase results in an ordering onto one of the basal-plane axes of the Cu(1) layer, the b-axis of the orthorhombic phase. (3) Ordering between and within b-axis chains gives rise to discrete phases predicted to occur at O 6.875, O 6.75, O 6.5, O 6.25, and O 6.125. (4) An equilibrium oxidation state for the intercalation layer depends not only on the oxygen partial pressure and temperature, but also on the cations of the structure. (5) At higher oxidation states of the intercalation layer, any oxygen atom on the a-axis interacts with a near-neighbor oxygen on the b-axis to trap out holes in a peroxide ion ( O 2)2−.

The effect of ligand, solvent and Cu(0) source on the efficient polymerization of polyether acrylates and methacrylates in aqueous and organic media

2015 ◽  
Vol 6 (32) ◽  
pp. 5940-5950 ◽  
Author(s):  
Alexandre Simula ◽  
Vasiliki Nikolaou ◽  
Fehaid Alsubaie ◽  
Athina Anastasaki ◽  
David M. Haddleton
Keyword(s):  
Radical Polymerization ◽  
Aqueous Media ◽  
Organic Media ◽  
Reversible Deactivation ◽  
Reversible Deactivation Radical Polymerization

The synthesis of well-defined telechelic polyacrylates and polymethacrylates in organic and aqueous media via Cu(0)-mediated reversible-deactivation radical polymerization is thoroughly investigated.

An efficient non-reaction based colorimetric and fluorescent probe for the highly selective discrimination of Pd0 and Pd2+ in aqueous media

RSC Advances ◽  
2016 ◽  
Vol 6 (65) ◽  
pp. 60546-60549 ◽  
Author(s):  
Lubna Rasheed ◽  
Muhammad Yousuf ◽  
Il Seung Youn ◽  
Genggongwo Shi ◽  
Kwang S. Kim
Keyword(s):  
Fluorescent Probe ◽  
High Selectivity ◽  
Aqueous Media ◽  
Oxidation States ◽  
Probe Molecule ◽  
Naked Eye ◽  
Fluorogenic Probe ◽  
The Difference

A novel anthraquinone-imidazole based colorimetric and fluorogenic probe 1 discriminates the oxidation states of Pd0 and Pd2+ by naked eye with high selectivity in aqueous media due to the difference in coordination in the pocket of probe molecule.

scholarly journals THE ISOLATION OF CELL NUCLEI IN NON-AQUEOUS MEDIA

1952 ◽  
Vol 35 (3) ◽  
pp. 529-557 ◽  
Author(s):  
V. Allfrey ◽  
H. Stern ◽  
A. E. Mirsky ◽  
H. Saetren
Keyword(s):  
Citric Acid ◽  
Serum Proteins ◽  
Aqueous Media ◽  
Organic Media ◽  
Cell Nuclei ◽  
Intracellular Enzyme ◽  
Cytoplasmic Proteins ◽  
Immunological Tests ◽  
Avian Erythrocytes ◽  
Enzyme Distribution

1. A modified Behrens procedure is described for the isolation of nuclei from avian erythrocytes and from the liver, kidney, thymus, pancreas, heart, and intestinal mucosa of the calf or horse. 2. The purity of these nuclei has been established by staining reactions, enzyme studies, and immunological tests for serum proteins. 3. Evidence is presented to show that a transport of cytoplasmic proteins into the nucleus does not occur during the isolation. 4. Nuclei prepared in non-aqueous media contain considerably more protein and a very different enzyme composition from that observed in nuclei prepared by "homogenization" techniques in dilute citric acid. 5. The suitability of nuclei prepared in organic media for the study of intracellular enzyme distribution is discussed.

On the Existence and Stability of Cations of d- and f-Transition Elements in Acidic Non-Aqueous Media

1988 ◽  
Vol 41 (9) ◽  
pp. 1433 ◽  
Author(s):  
TA Odonnell
Keyword(s):  
Aqueous Solution ◽  
Chemical Nature ◽  
Aqueous Media ◽  
Transition Element ◽  
Oxidation States ◽  
Transition Elements ◽  
Acidic Media ◽  
Acidic Aqueous Solution ◽  
Existence And Stability ◽  
Acidic Solvents

Recently observed spectra of solvated d- and f-transition element cations in superacidic media, together with spectra of aqua cations in acidic aqueous solution, are used to propose that cationic speciation is much more general in acidic solvents and melts than is usually accepted. It will be shown that cations in unusually low oxidation states are stabilized in highly acidic media, and that these cations disproportionate as the acidity of the medium is decreased and that in general these latter phenomena are independent of the chemical nature or the temperature domain of the medium.

scholarly journals Factors Affecting the Rate of Breast Cancer; Role of Heavy Metals

2020 ◽  
Vol 11 (3) ◽  
pp. 57-64
Author(s):  
Shabbir Hussain ◽  
Sumra Naseer ◽  
Muhammad Waqas ◽  
Samina Ashraf ◽  
Aisha Saddiqa ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Redox Reactions ◽  
Chemical Structure ◽  
Epidemiologic Studies ◽  
Oxidation States ◽  
International Agency ◽  
Factors Affecting ◽  
Potential Risk Factors ◽  
Breast Cells

Breast cancer is caused by uncontrolled growth of breast cells. It is more common in women as compared tothat in men. The breast cancer may be interlinked with the drinking of alcohol, smoking, sex, hormonal therapy, obesity,family history and age. Various epidemiologic studies suggest the role of metals e.g., nickel (Ni), zinc (Zn), arsenic(As),selenium (Se)and cadmium (Cd)as potential risk factors in breast cancer. Humans are exposed to these metals bymeans of drinking water, food and air. The oxidative theory suspects that the complexes formed from these metals invivo, near the location of DNA, catalyze the redox reactions which results in oxidation of DNA. The metals like arsenic(As), chromium (Cr), aluminum (Al), cadmium (Cd) and chromium (Cr)which exist in trace amount are considered ascarcinogens for organisms by IARC (International Agency for Research on Cancer). The carcinogenicity of these metalsmainly depends upon their chemical structure and oxidation states.

Sign in / Sign up

Export Citation Format

Share Document