References of "Radiochimica Acta"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailImmobilization of actinide ions in thin layers of polypyrrole/polyacrylamidoglycolic acid (PPy/PAGA) composite. Application to the preparation of alpha spectrometry sources
Leroy, D.; Martinot, Lucien; Mignosin, P. et al

in Radiochimica Acta (2002), 90(5), 279-284

We propose a new fully aqueous electrochemical method for the preparation of high resolution alpha sources. Thin films of polypyrrole (PPy) are prepared by anodic electropolymerization, starting from ... [more ▼]

We propose a new fully aqueous electrochemical method for the preparation of high resolution alpha sources. Thin films of polypyrrole (PPy) are prepared by anodic electropolymerization, starting from aqueous solutions of the pyrrole monomer and an anionic polyelectrolyte which is able to complex actinide and play the role of PPy doping agent: polyacrylamidoglycolic acid (PAGA). These thin films can be prepared on various electrodes: stainless steel, platinum, glassy carbon and polyethylene doped by carbon-black. Peeling tests revealed their strong adhesion on stainless steel electrode. Alpha sources were prepared by simple immersion in actinide containing solutions. This easy process results in alpha sources with outstanding energy resolution (FWHM: around 9 keV for various isotopes). [less ▲]

Detailed reference viewed: 23 (2 ULg)
Full Text
Peer Reviewed
See detailBinding and release of metallic cations by a polyaniline-based resin
Jérôme, Christine ULg; Martinot, Lucien; Jérôme, Robert ULg

in Radiochimica Acta (2000), 88(1), 39-46

The electrochemical control of the binding of metallic ions (actinides and a lanthanide) by redox active polyaniline resin, i.e., polyaniline doped by polystyrene sulfonate (Pani/PSSO3), has been studied ... [more ▼]

The electrochemical control of the binding of metallic ions (actinides and a lanthanide) by redox active polyaniline resin, i.e., polyaniline doped by polystyrene sulfonate (Pani/PSSO3), has been studied. Electrochemical and nuclear techniques (cyclic voltammetry, α -counting, Rutherford backscattering) have been used in order to characterize the exchange of thorium, lanthanum and uranium cations, particularly in terms of reversibility and efficiency. This electrochemical process has been compared with the chemical one promoted merely by pH variation, and the efficiency of the two methods has been discussed for each type of cation. [less ▲]

Detailed reference viewed: 40 (3 ULg)
Full Text
Peer Reviewed
See detailPotentiometric-controlled exchange of actinide and lanthanide cations by electrically conducting polymers based resin
Jérôme, Christine ULg; Mertens, Marc; Martinot, Lucien et al

in Radiochimica Acta (1998), 80

Polypyrrole polystyrene sulfonate resins have been electro- chemically synthesized, and the ability of these films to control potentiometrically the exchange of thorium, uranium and lantha- num cations ... [more ▼]

Polypyrrole polystyrene sulfonate resins have been electro- chemically synthesized, and the ability of these films to control potentiometrically the exchange of thorium, uranium and lantha- num cations has been studied using electrochenücal and nuclear methods (a counting, RBS). The actual effect of the applied Potential on the exchange process has been demonstrated. The effect of various parameters on the Th cation binding, such as the polymer thickness and the oxidation State of the resin, has also been studied. A low incorporation of uranium has been ob- served and rationalized by the redox instability of the polymer resin. The reversibility of the Th and La exchange has also been quantified and optimized. [less ▲]

Detailed reference viewed: 9 (2 ULg)
Full Text
Peer Reviewed
See detailBinding of lanthanide and actinide cations by polypyrrole resins
Jérôme, Christine ULg; Martinot, Luien; Jérôme, Robert ULg

in Radiochimica Acta (1998), 83

The fixation of thorium cations by reduction of polypyrrole/ polystyrene sulfonate resins has been studied in relation to the most important experimental parameters, i.e. potential scan rate, pH, cation ... [more ▼]

The fixation of thorium cations by reduction of polypyrrole/ polystyrene sulfonate resins has been studied in relation to the most important experimental parameters, i.e. potential scan rate, pH, cation concentration of the electrolytic bath and capacity of the resin. The electropolymerization of pyrrole in aqueous solu- tions of NaC104 and polystyrene sulfonate allows the capacity and the structure of the resins to be changed and correlated to the Th4+ fixation, which is of prime importance for the potential of these resins in the treatment of radioactive wastes. [less ▲]

Detailed reference viewed: 10 (2 ULg)
Full Text
Peer Reviewed
See detailImmobilization of Actinides by Electropolymerization of Acrylonitrile: Application to the Preparation of Alpha Spectroscopy Sources
Martinot, Lucien; Mertens, Marc; Lopes, L. et al

in Radiochimica Acta (1996), 75(2), 111-119

Summary The electrochemical reduction of uranium and neptunium ions is achieved in aprotic solvents in presence of acrylonitrile. The cathodic deposit on a usual metal consists of a grafted poly ... [more ▼]

Summary The electrochemical reduction of uranium and neptunium ions is achieved in aprotic solvents in presence of acrylonitrile. The cathodic deposit on a usual metal consists of a grafted poly- acrylonitrile layer in which actinide oxide or actinide metal has been inserted as a consequence of the overall cathodic reaction. As polyacrylonitrile is an insulating material, the electrochemi- cal polymerization reaction is stopped when the polymer layer thickness reaches 1000 A at maximum. The material we thus produced may be used as an alpha spectroscopy source and we report here the results originating from the preparation of more than hundred samples. [less ▲]

Detailed reference viewed: 13 (2 ULg)