External Field Assisted Freeze Casting
| Autor: | Michael B. Frank, Frances Y. Su, Taylor A. Ogden, Steven E. Naleway, Pooya Niksiar, Joanna McKittrick, Marc A. Meyers, Michael M. Porter |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Nucleation 02 engineering and technology General Medicine 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Electromagnetism Acoustic radiation Composite material 0210 nano-technology Supercooling Porous medium Porosity Anisotropy Directional solidification |
| Zdroj: | Ceramics. 2:208-234 |
| ISSN: | 2571-6131 |
| Popis: | Freeze casting under external fields (magnetic, electric, or acoustic) produces porous materials having local, regional, and global microstructural order in specific directions. In freeze casting, porosity is typically formed by the directional solidification of a liquid colloidal suspension. Adding external fields to the process allows for structured nucleation of ice and manipulation of particles during solidification. External control over the distribution of particles is governed by a competition of forces between constitutional supercooling and electromagnetism or acoustic radiation. Here, we review studies that apply external fields to create porous ceramics with different microstructural patterns, gradients, and anisotropic alignments. The resulting materials possess distinct gradient, core–shell, ring, helical, or long-range alignment and enhanced anisotropic mechanical properties. |
| Databáze: | OpenAIRE |
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