Mrs
Wendy Pemberton
(University of Nevada, Las Vegas)
19/04/2010, 11:45
Chemistry of Actinide and Trans-actinide Elements
Poster
Room temperature ionic liquids (RTILs) were known as early as the 19th century beginning with alkylammonium nitrates. The field grew in the 1970s by using combinations of air and water sensitive aluminum halides with an organic cation salt. While these ionic liquids were useful and had many desirable features, they were extremely sensitive to air and water, limiting their utility. RTILs today...
Dr
Oxana Nipruk
(Nizhny Novgorod State University named after N.I. Lobachevsky)
19/04/2010, 11:45
Chemistry of Actinide and Trans-actinide Elements
Poster
Uranoarsenates and uranophosphates belong to a numerous difficult soluble compounds that can be formed by the ingress of various uranium-containing waste in the environment and can also be used as uranium-fixing matrices in technological processes. Research of the state of these compounds in aqueous solutions, of their hydrolytic stability and solubility, and of transformations of...
Prof.
Viacheslav Radchenko
(JSC "State Scientific Center - Research Institute of Atomic Reactors")
19/04/2010, 11:45
Chemistry of Actinide and Trans-actinide Elements
Poster
Over many years JSC “SSC RIAR” has been performing activities on the production and investigation of metals of transplutonium elements (TPE), their alloys and compounds.
This paper presents the results of production and X-ray examination of micro-samples of americium-241 compounds with gold and copper, i.e. identification of crystal structures of the compounds obtained and calculation of...
Mr
Nikolay Aksenov
(Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research)
19/04/2010, 11:45
Chemistry of Actinide and Trans-actinide Elements
Poster
Chemical identification of radionuclides in the decay chains of the recently discovered transactinide elements may serve as a method for confirming the discovery [1]. The longer half-lives of radionuclides of transactinides discovered in the An + 48Ca reactions expands the application of radiochemical techniques for their chemical characterization [2]. The method of cocrystallization can give...
Ms
Aylin Ölcer
(Institute of Nuclear Chemistry, Johannes-Gutenberg-Universität Mainz)
19/04/2010, 11:45
Chemistry of Actinide and Trans-actinide Elements
Poster
Room-temperature ionic liquids (RTILs) consist of organic cations and organic or inorganic anions. Beside their fluidity over a large temperature range, they have versatile physical and chemical properties, e.g. low vapour pressure, thermical and chemical stability [1]. In our investigation, the wide electrochemical window of RTILs is of particular importance. RTILs are considered as “green...
Mr
Alexander Osipenko
(Research Institute of Atomic Reactors)
19/04/2010, 11:45
Chemistry of Actinide and Trans-actinide Elements
Poster
Curium isotopes contained in spent nuclear fuel have a high specific heat rate and long half-life, and they should be recovered from high-level wastes (HLW) and transmutated. Molten chlorides have more high radiation resistance than aqueous and organic media. This fact is of significant importance because curium has a high specific activity. There is not much information about the behaviour of...
Prof.
Viacheslav Radchenko
(JSC "State Scientific Center - Research Institute of Atomic Reactors")
19/04/2010, 11:45
Chemistry of Actinide and Trans-actinide Elements
Poster
Presented are the results of production and x-ray examination of ruthenium compounds with curium and technetium.
A curium -244 alloy microsample was produced by the high-temperature condensation of curium vapor onto the ruthenium substrate and then analyzed by the x-ray diffractometric method. Two intermetallides were detected in the sample: Ru2Cm with a hexagonal lattice of the Zn2Mg type...
Ms
Isabell Dreissig
(Forschungszentrum Dresden-Rossendorf)
19/04/2010, 11:45
Chemistry of Actinide and Trans-actinide Elements
Poster
This work presents results about the formation of thorium(IV) colloids and precipitates in the presence of silicic acid. Three methods were used for the preparation of the thorium compounds:
- Experiment A: Silicic acid concentrations and ionic strengths were adjusted in the presence of preformed stable ThO2 colloids at neutral pH (0.4 mM Th; 0 3 mM Si; I = 0.05 M NaClO4)
- Experiment B:...
Dr
Vladimir Chistyakov
(Russia, Rosatom, JSC"State Scientific Center-Research Institute of Atomic Reactors", Radiochemical Unit)
19/04/2010, 11:45
Chemistry of Actinide and Trans-actinide Elements
Poster
Behavior of Np(V) in strong nitric acid solutions with different strength (1,0 ÷ 3,0) mol∙l-1 and KPW (1 ÷ 5)∙10-3 mol∙l-1, containing potassium phosphotungstate, K10P2W17O61 (KPW) is examined by spectrophotometric method .
It is established that Np (V) final conversion products under studied experimental conditions are Np (IV) and Np (VI), and the process is going in accordance with a...
Mr
Harold Brice Tanh Jeazet
(FZD Dresden Rossendorf (Institute of Radiochemistry))
19/04/2010, 11:45
Chemistry of Actinide and Trans-actinide Elements
Poster
The coordination chemistry of uranium in different oxidation states has recently generated much attention due to several reasons. The most important reason is the separation of U(VI) present in radioactive waste, but also the effects of U(VI) on our environment are of great interest.[1] The extraction and separation of U(VI) and other actinides, especially the separation from lanthanides, is...
Prof.
Viacheslav Radchenko
(JSC "State Scientific Center - Research Institute of Atomic Reactors")
19/04/2010, 11:45
Chemistry of Actinide and Trans-actinide Elements
Poster
Under limited availability of transplutonium metals special techniques and methods of their production have been developed that combine the process of metal reduction from a chemical compound and preparation of a sample for examination. In this situation the evaporation and condensation of metal onto substrate becomes the only possible technology.
Thin film samples of metal curium (244Cm,...
Prof.
Viacheslav Radchenko
(JSC "State Scientific Center - Research Institute of Atomic Reactors")
19/04/2010, 11:45
Chemistry of Actinide and Trans-actinide Elements
Poster
Over many years JSC “SSC RIAR” has been performing activities on the production and in-vestigation of metals of transplutonium elements (TPE), their alloys and compounds.
This paper presents the results of production and radiographic examination of micro-samples of curium-244 compounds with ion, cobalt and carbon, namely an identification of crystal lattices of the compounds obtained and...
Mr
Nikolay Aksenov
(Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research)
19/04/2010, 11:45
Chemistry of Actinide and Trans-actinide Elements
Poster
In order to optimize conditions for isolation and study of chemical properties of Rf and Db [1], we investigated sorption of their lighter homologues Ti, Zr, Hf, Nb and Ta, from HF solutions in water-miscible organic solvents using the Dowex 50x8 cation exchange (CIX) and AG 1x8 anion exchange (AIX) resins. We studied dependence of sorption on concentration of HF and acetone. We found that...
Ms
Natallia Torapava
(Swedish University of Agricultural Sciences)
19/04/2010, 11:45
Chemistry of Actinide and Trans-actinide Elements
Poster
The hydrated thorium(IV) ion is nine-coordinate in strongly acidic aqueous solution with a mean Th-O bond distance of 2.45(1) Å as determined by extended X-ray absorption fine structure (EXAFS) and large angle X-ray scattering (LAXS) [1]. The presence of a second hydration sphere was indicated by LAXS with cca 18 water molecules at 4.66(2) Å. Structural studies in aqueous solution of the...
Mr
Alexander Osipenko
(Research Institute of Atomic Reactors)
19/04/2010, 11:45
Chemistry of Actinide and Trans-actinide Elements
Poster
Molten chlorides have more high radiation resistance than aqueous and organic media. This fact is of significant importance because curium has a high specific activity. And, correspondingly, it can be used for partitioning of curium from waste before its vitrification. Data on thermodynamics of formation for oxygen-containing curium compounds in chloride melts was obtained by authors [1] with...
Dr
Yuliya Pykhova
(Nizhny Novgorod State University named after N.I. Lobachevsky)
19/04/2010, 11:45
Chemistry of Actinide and Trans-actinide Elements
Poster
Synthetic trogerite (UO2)3(AsO4)2∙12H2O (henceforth only ST) can be obtained by direct mixing of uranyl nitrate and arsenic acid solutions in equivalent ratio 3:2. In this case the following competitive reactions become possible:
UO2(NO3)2 + H3AsO4 +...
Mr
Alexey Serov
(PhD Student)
19/04/2010, 11:45
Chemistry of Actinide and Trans-actinide Elements
Poster
Investigation of chemical properties of super heavy elements (SHE) produced in 48Ca induced nuclear fusion reactions with actinide targets [1-4] represents a challenging task for chemists world wide. In the present research an experimental determination of dHads. of carrier-free 113mIn, 125Sb and 125mTeO2 species on quartz surface was performed.
Lighter homologues of SHE elements...
Dr
Akira Kirishima
(Institute of Multidisciplinary Research for Advanced Materials, Tohoku University)
19/04/2010, 11:45
Chemistry of Actinide and Trans-actinide Elements
Poster
The thermodynamics of complex formation of U(VI) with oxydiacetic acid (ODA), thiodiacetic acid (TDA), iminodiacetic acid (IDA), isopthalic acid (IPA), 2,5-frandicarboxylic acid (FDA) and dipicolinic acid (DPA) were studied by the micro-calorimetric titration technique. So far, extensive data on stability constant have been obtained and summarized in databases for a variety of combinations of...
