Are Nanoporous Materials Radiation Resistant?
| Autor: | Michael Nastasi, Joshua Monk, Diana Farkas, Y.Q. Wang, S. T. Picraux, Alfredo Caro, Luis A. Zepeda-Ruiz, Farid F. Abraham, Mark A. Duchaineau, Amit Misra, Eduardo M. Bringa |
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| Rok vydání: | 2011 |
| Předmět: |
Materials science
business.industry Nanoporous Ciencias Físicas Mechanical Engineering Bioengineering COMPUTER SIMULATIONS General Chemistry Radiation NANOFOAMS Condensed Matter Physics RADIATION DAMAGE Optics Surface-area-to-volume ratio Radiation damage General Materials Science GOLD Irradiation Composite material business Porosity Nanoscopic scale CIENCIAS NATURALES Y EXACTAS Física de los Materiales Condensados Nanofoam |
| Zdroj: | Nano Letters. 12:3351-3355 |
| ISSN: | 1530-6992 1530-6984 |
| DOI: | 10.1021/nl201383u |
| Popis: | The key to perfect radiation endurance is perfect recovery. Since surfaces are perfect sinks for defects, a porous material with a high surface to volume ratio has the potential to be extremely radiation tolerant, provided it is morphologically stable in a radiation environment. Experiments and computer simulations on nanoscale gold foams reported here show the existence of a window in the parameter space where foams are radiation tolerant. We analyze these results in terms of a model for the irradiation response that quantitatively locates such window that appears to be the consequence of the combined effect of two length scales dependent on the irradiation conditions: (i) foams with ligament diameters below a minimum value display ligament melting and breaking, together with compaction increasing with dose (this value is typically ∼5 nm for primary knock on atoms (PKA) of ∼15 keV in Au), while (ii) foams with ligament diameters above a maximum value show bulk behavior, that is, damage accumulation (few hundred nanometers for the PKA's energy and dose rate used in this study). In between these dimensions, (i.e., ∼100 nm in Au), defect migration to the ligament surface happens faster than the time between cascades, ensuring radiation resistance for a given dose-rate. We conclude that foams can be tailored to become radiation tolerant. Fil: Bringa, Eduardo Marcial. Universidad Nacional de Cuyo. Facultad de Ciencias Exactas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza; Argentina Fil: Monk, J. D.. Louisiana State University. Cain Department of Chemical Engineering; Estados Unidos Fil: Caro, A.. Los Alamos National Laboratory; Estados Unidos Fil: Misra, A.. Los Alamos National Laboratory; Estados Unidos Fil: Zepada Ruiz, L.. Lawrence Livermore National Laboratory; Estados Unidos Fil: Duchaineau, M.. Lawrence Livermore National Laboratory; Estados Unidos Fil: Abraham, F.. Lawrence Livermore National Laboratory; Estados Unidos Fil: Nastasi, M.. Los Alamos National Laboratory; Estados Unidos Fil: Picraux, S.T.. Los Alamos National Laboratory; Estados Unidos Fil: Wang, Y.Q.. Los Alamos National Laboratory; Estados Unidos Fil: Farkas, D.. Virginia Tech. Department of Materials Sciences; Estados Unidos |
| Databáze: | OpenAIRE |
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