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RISS 인기검색어
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- 저자 : Cardinaels, Thomas (검색결과 2 건)
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Towards unraveling the sintering process of two polystyrene particles by numerical simulations
Caroline Balemans,Prakhyat Hejmady,Ruth Cardinaels,Patrick D. Anderson 한국유변학회 2019 Korea-Australia rheology journal Vol.31 No.4
In this work, we study different rheological and thermal phenomena present during laser sintering of two polystyrene (PS) particles using fully resolved numerical simulations. In our analysis, we varied the laser power, the initial temperature and the thermal convection coefficient, used different rheological descriptions for the flow behavior and in addition studied the effect of the substrate (used in the experiments) on the temperature distribution of the system. Although we are not able to fully describe the results of the experiments with our simulations for the given parameter set, we obtained important insights in the significance of thermal initial and boundary conditions by systematically studying the sintering process.
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The conversion of ammonium uranate prepared via sol-gel synthesis into uranium oxides
Schreinemachers, Christian,Leinders, Gregory,Modolo, Giuseppe,Verwerft, Marc,Binnemans, Koen,Cardinaels, Thomas Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.5
A combination of simultaneous thermal analysis, evolved gas analysis and non-ambient XRD techniques was used to characterise and investigate the conversion reactions of ammonium uranates into uranium oxides. Two solid phases of the ternary system NH<sub>3</sub> - UO<sub>3</sub> - H<sub>2</sub>O were synthesised under specified conditions. Microspheres prepared by the sol-gel method via internal gelation were identified as 3UO<sub>3</sub>·2NH<sub>3</sub>·4H<sub>2</sub>O, whereas the product of a typical ammonium diuranate precipitation reaction was associated to the composition 3UO<sub>3</sub>·NH<sub>3</sub>·5H<sub>2</sub>O. The thermal decomposition profile of both compounds in air feature distinct reaction steps towards the conversion to U<sub>3</sub>O<sub>8</sub>, owing to the successive release of water and ammonia molecules. Both compounds are converted into α-U<sub>3</sub>O<sub>8</sub> above 550 ℃, but the crystallographic transition occurs differently. In compound 3UO<sub>3</sub>·NH<sub>3</sub>·5H<sub>2</sub>O (ADU) the transformation occurs via the crystalline β-UO<sub>3</sub> phase, whereas in compound 3UO<sub>3</sub>·2NH<sub>3</sub>·4H<sub>2</sub>O (microspheres) an amorphous UO<sub>3</sub> intermediate was observed. The new insights obtained on these uranate systems improve the information base for designing and synthesising minor actinide-containing target materials in future applications.
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