Crack formation and self-healing behavior during the drying of alumina gels: Experimental studies
| Autor: | Fouzia Achchaq, Wahbi Jomaa, Jean-Rodolphe Puiggali, A. Godin, M. Duquesne, K. Djellab |
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| Přispěvatelé: | Institut de Mécanique et d'Ingénierie de Bordeaux (I2M), École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB), Génie Enzymatique et Cellulaire (GEC), Université de Technologie de Compiègne (UTC)-Université de Picardie Jules Verne (UPJV)-Centre National de la Recherche Scientifique (CNRS), Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)-École Nationale Supérieure d'Arts et Métiers (ENSAM), HESAM Université (HESAM)-HESAM Université (HESAM)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Work (thermodynamics)
Materials science General Chemical Engineering Humidity Alumina gel 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Thermal diffusivity 01 natural sciences Chemical reaction 0104 chemical sciences Ambient humidity Self-healing [SPI.MECA.THER]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph] [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering Physical and Theoretical Chemistry Composite material 0210 nano-technology ComputingMilieux_MISCELLANEOUS Shrinkage |
| Zdroj: | Drying Technology Drying Technology, Taylor & Francis, 2016, 34 (12), pp.1501-1509 HAL |
| ISSN: | 0737-3937 1532-2300 |
| Popis: | The high shrinkage of alumina gels during the drying process leads to cracks. In this work, the behavior of four alumina gel formulations was experimentally studied following two drying procedures: (i) at ambient temperature and ambient humidity, outside a convective dryer and (ii) inside the dryer, allowing the application of different conditions of temperature and humidity. During the experiments, the observations in real time showed shrinkage of gels and the formation of cracks on them due to drying. Two of the gels displayed a capacity for self-healing, requiring numerical treatment of pictures to distinguish the closure of cracks due to shrinkage from those due to self-healing. The results show the precise determination of shrinkage steps, the estimation of the “shrinkage diffusivity” and proved that the manifestation of the chemical reaction is responsible for self-healing, activated by both applied temperature conditions and residual water of gels. Additional in situ investigations at micro... |
| Databáze: | OpenAIRE |
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