Particles redistribution and structural defects development during ice templating
| Autor: | Jérôme Adrien, Audrey Lasalle, Sylvain Deville, Christian Guizard, Eric Maire |
|---|---|
| Přispěvatelé: | Laboratoire de Synthèse et Fonctionnalisation de Céramiques (LSFC), Saint Gobain-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Matériaux, ingénierie et science [Villeurbanne] (MATEIS), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Flocculation
Materials science Polymers and Plastics FOS: Physical sciences Applied Physics (physics.app-ph) 02 engineering and technology ceramic material mechanical properties 010402 general chemistry 01 natural sciences Colloid Redistribution (chemistry) Ceramic defects Scattering Fluid Dynamics (physics.flu-dyn) Metals and Alloys [CHIM.MATE]Chemical Sciences/Material chemistry Physics - Applied Physics Physics - Fluid Dynamics 021001 nanoscience & nanotechnology Electrostatics 0104 chemical sciences Electronic Optical and Magnetic Materials Crystallography Compressive strength Chemical physics visual_art Ceramics and Composites visual_art.visual_art_medium Freeze-casting cellular solids 0210 nano-technology Porous medium |
| Zdroj: | Acta Materialia Acta Materialia, Elsevier, 2012, 60 (11), pp.4594-4603. ⟨10.1016/j.actamat.2012.02.023⟩ |
| ISSN: | 1359-6454 |
| DOI: | 10.1016/j.actamat.2012.02.023⟩ |
| Popis: | The freezing of colloidal suspensions is encountered in many natural and engineering processes. It can be harnessed through a process known as ice templating, to produce porous materials and composites exhibiting unique functional properties. The phenomenon by itself appears simple: a solidification interface propagates through a colloidal suspension. We are nevertheless still far from a complete understanding and control of the phenomenon. Such lack of control is reflected in the very large scattering of mechanical properties reported for ice-templated ceramics, largely due to the formation of structural defects. Through systematic in situ investigations, we demonstrate here the role of the suspension composition and the role of particle-particle electrostatic interactions on defect formation during ice templating. Flocculation can occur in the intercrystal space, leading to a destabilisation of the solid/liquid interface triggering the growth of crystals perpendicular to the main ice growth direction. This mechanism largely contributes to the formation of structural defects and explains, to a large extent, the scattering of compressive strength values reported in the literature. 19 pages, 9 figures |
| Databáze: | OpenAIRE |
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