| 1. |
- Aneheim, Emma, 1982, et al.
(author)
-
Dissolution Performance of Plutonium Nitride Based Fuel Materials
- 2016
-
In: Atalante 2016 International Conference on Nuclear Chemistry for Sustainable Fuel Cycles. - : Elsevier BV. - 1876-6196. ; 21, s. 231-238
-
Conference paper (peer-reviewed)abstract
- Nitride fuels have been regarded as one viable fuel option for Generation IV reactors due to their positive features compared to oxides. To be able to close the fuel cycle and follow the Generation IV concept, nitrides must, however, demonstrate their ability to be reprocessed. This means that the dissolution performance of actinide based nitrides has to be thoroughly investigated and assessed. As the zirconium stabilized nitrides show even better potential as fuel material than does the pure actinide containing nitrides, investigations on the dissolution behavior of both PuN and (Pu,Zr)N has been undertaken. If possible it is desirable to perform the fuel dissolutions using nitric acid. This, as most reprocessing strategies using solvent-solvent extraction are based on a nitride containing aqueous matrix. (Pu,Zr)N/C microspheres were produced using internal gelation. The spheres dissolution performance was investigated using nitric acid with and without additions of HF and Ag(II). In addition PuN fuel pellets were produced from powder and their dissolution performance were also assessed in a nitric acid based setting.
|
|
| 2. |
- Aneheim, Emma, 1982, et al.
(author)
-
Extraction experiments after radiolysis of a proposed GANEX solvent - the effect of time
- 2012
-
In: Procedia Chemistry. - : Elsevier BV. - 1876-6196. ; 7, s. 123-129
-
Conference paper (peer-reviewed)abstract
- In a solvent intended for use within group actinide extraction CyMe4-BTBP and TBP are combined together in cyclohexanone. After irradiating the solvent in acid contact a latency period before extraction reduced the extraction capability of plutonium. This reduction was larger when the solvent was kept in contact with the acid after irradiation. The decrease in plutonium extraction could be an effect of both a reduced extraction performance of CyMe4-BTBP caused by hydrolysis as well as a shift in oxidation state of the plutonium as it was shown that oxidizing Pu(IV) to Pu(VI) decreased the extraction by the solvent. (C) 2012 Elsevier B. V. .. Selection and/or peer-review under responsibility of the Chairman of the ATALANTE 2012 Program Committee
|
|
| 3. |
- Aroutiounian, V., et al.
(author)
-
Fluctuation-enhanced gas sensing
- 2009
-
In: Procedia Chemistry. - : Elsevier BV. - 1876-6196.
-
Conference paper (peer-reviewed)abstract
- The sensitivity of gas sensors was earlier measured by classical method-comparison the resistance of sensors in gas media and air. Here we reported results of the study of low-frequency noise characteristics of sensors. We compare data for different Figaro TGS sensors as well as our sol-gel H-2 tin dioxide and porous silicon sensors. The study was performed in dry air and in a mix of dry air with carbon monoxide, hydrogen and alcohol of different concentrations. Higher sensitivity of spectral dependence of noise (SDN) to gas concentration in comparison with classical method of the measurements of gas sensing by a change in the Ohmic resistance part of current-voltage characteristics of samples allows using such SND powerful method for determination of gas concentration in the air or environment.
|
|
| 4. |
- Eriksson, Mats, et al.
(author)
-
Event Detection in Crisis Management Systems
- 2009
-
In: Procedia Chemistry. - : Elsevier. - 1876-6196. ; 1:1, s. 1055-1058
-
Journal article (peer-reviewed)abstract
- The EVENT project concerns drinking water surveillance and includes sensors and algorithms that detect anomalies in the drinking water properties, communication of the evaluated sensor data to a crises management system and presentation of information that is relevant for the end users of the crises management system. We have chosen to focus on a sensor technique based on an "electronic tongue", since this robust type of non-selective sensor, can detect a plurality of anomalies without the need of a specific sensor for each type of event. Measurements of natural variations and contamination events are presented and discussed.
|
|
| 5. |
- Fallqvist, Amie, et al.
(author)
-
Optically addressable field effect nano-environments for chemical imaging
- 2009
-
In: Procedia Chemistry. - : ELSEVIER SCIENCE BV. - 1876-6196. ; 1:1, s. 224-227
-
Journal article (peer-reviewed)abstract
- An optically addressable field effect device Incorporating functionalized nano-environments is demonstrated for the generation of multiple response signatures of a same analyte-sensing material combination. The device can operate unsupervised and different response mechanism can be simultaneously tested and incorporated in a multidimensional response. This proof of concept explores the well-known Pd-H-2 case, while the concept is a breadboard for chemical imaging experiments.
|
|
| 6. |
- Geist, A., et al.
(author)
-
The SACSESS Hydrometallurgy - Domain an Overview
- 2016
-
In: Atalante 2016 International Conference on Nuclear Chemistry for Sustainable Fuel Cycles. - : Elsevier BV. - 1876-6196. ; 21, s. 218-222
-
Conference paper (peer-reviewed)abstract
- The EURATOM FP7 project SACSESS (Safety of Actinide Separation Processes) is in continuity of a long line of preceding EURATOM projects. SACSESS is organised along four domains, one of them related to the development of hydrometallurgical (i.e. solvent extraction based) actinide separations processes. Within this domain, the most promising processes developed in previous projects are further developed, improving their technology readiness level (TRL) towards the point at which safe industrial implementation will be achievable.
|
|
| 7. |
- Holgersson, Stellan, 1964
(author)
-
Studies on Batch Sorption Methodologies: Eu Sorption onto Kivetty Granite
- 2012
-
In: Procedia Chemistry. - : Elsevier BV. - 1876-6196. ; 7, s. 629-640
-
Conference paper (peer-reviewed)abstract
- Six different methodological features of the batch sorption experiment were investigated using 152Eu, Kivetty granite, saline water with initial pH of 8.5, 9 and 10, [Eu]tot=5*10-7M, S:L = 1:20, pre-washing of granite, occasional shaking, centrifugation,wall sorption correction with separate tubes. This gave final Rd= 8.3±2.1, 7.3±2.6 and 8.6±3.7m3/kg at 6 months for each pH,respectively. Then [Eu]tot and S:L were varied, filtration was compared with centrifugation, separate tubes for wall sorption was compared with wall desorption, pre-washing of granite was compared with no washing and two shaking methods werecompared. Two of the investigated methodological features gave too large apparent Rd due to: 1) filter sorption, and 2) low radiotracer concentration, leading to detection problems.
|
|
| 8. |
- Löfström Engdahl, Elin, 1983, et al.
(author)
-
The Extraction of Silver and the effect of Diluent, Ligand side group and Solvent composition
- 2012
-
In: Procedia Chemistry. - : Elsevier BV. - 1876-6196. ; 7, s. 239 - 244
-
Conference paper (peer-reviewed)abstract
- Solvent extraction and the so called BTBP class of ligands can be used for the separation of the actinides fromthe rest of used nuclear fuel. One troublesome co-extracting element in this separation is silver.Therefore, two different BTBP molecules, having different side groups have been investigated. It was shown thatthe silver distribution ratio is higher using the CyMe4-BTBP than theC2 -BTBP ligand. In additionalexperiments, it was shown that no water soluble silver complex is formed in the CyMe4 system and that thecomplex is one ligand / metal. No effect of varying the diluent/solvent was proven
|
|
| 9. |
- Macken, Stephen, et al.
(author)
-
Monolithic SU-8 Microcavities for Efficient Fluorescence Collection
- 2009
-
In: Procedia Chemistry. - : ELSEVIER SCIENCE BV. - 1876-6196. ; 1:1, s. 1115-1118
-
Journal article (peer-reviewed)abstract
- The fabrication of capped microstructures such as channels or cavities typically involves multiple production steps. In this work we demonstrate a fabrication procedure that enables the generation of capped monolithic microstructures of arbitrary geometry in one single exposure step. The presented method also enables the embedment of metal self-aligned surfaces for use as electrodes or mirrors. The devices furthermore demonstrate a capability of increasing fluorescent collection, as measured by an epifluorescent inverted microscope, by up to 15 fold.
|
|
| 10. |
- Preechaburana, Pakorn, et al.
(author)
-
Snapshot Mask-less fabrication of embedded monolithic SU-8 microstructures with arbitrary topologies
- 2009
-
In: Procedia Chemistry. - : ELSEVIER SCIENCE BV. - 1876-6196. ; 1:1, s. 778-781
-
Journal article (peer-reviewed)abstract
- Microscope projection lithography offers an affordable alternative for fast prototyping of 3D polymer microstructures. Here we introduce a 3D mask-less approach operating on a routine epi-fluorescene microscope that enables the fabrication of 3D microstructures such as lenses, pillar forests, cavities and channels embedded in a monolithic SU-8 structure defined in a single exposure step. Fabrication times of about 1 hour from design to finished structure are achieved and 5 mu m resolution is possible in the present configuration.
|
|
