Bone-inspired healing of 3D-printed porous ceramics
| Autor: | Yong Chen, Qiming Wang, Kyung Hoon Lee, Runrun Zhang, Amy E. Childress, Allyson L. McGaughey, An Xin, Bingyuan Ruan, Kunhao Yu, Zhangzhengrong Feng |
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| Rok vydání: | 2020 |
| Předmět: |
3d printed
Materials science Calcium carbonate crystals Precipitation (chemistry) Process Chemistry and Technology Human bone 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Corrosion Porous ceramics Dental crowns Mechanics of Materials visual_art visual_art.visual_art_medium General Materials Science Ceramic Electrical and Electronic Engineering Composite material 0210 nano-technology |
| Zdroj: | Materials Horizons. 7:2130-2140 |
| ISSN: | 2051-6355 2051-6347 |
| DOI: | 10.1039/d0mh00131g |
| Popis: | Emerging 3D-printed ceramics, though showing unprecedented application potential, are typically vulnerable to fractures and unable to heal at room temperature. By contrast, their natural counterparts, human bones, exhibit extraordinary self-healing capability through the activation of stem cell osteoblasts that precipitate mineralized calluses to enable interfacial healing at body temperature. Inspired by bones, we here employ bacteria as artificial osteoblasts to enable healing of 3D-printed porous ceramics at room temperature. The healing behavior relies on bacteria-initiated precipitation of calcium carbonate crystals to bridge fracture interfaces of ceramics. We show that bacteria-loaded porous ceramics can heal fracture interfaces to restore 100% mechanical strength at room temperature, and the healed strength is not compromised by heating up to 500 C or by corrosion of alkalis and oxidants. The bacteria-assisted healing mechanism is revealed by systematic control experiments, and the healing strength is explained by cohesive fracture modeling. We further incorporate this method into 3D-printed ceramics and demonstrate on-demand healing of ceramic dental crowns, ceramic water membranes, and ceramic lattices, and autonomous healing of ceramic armor. As the first-generation healing mechanism of 3D-printed ceramics, this paradigm is expected to open promising avenues for revolutionizing the low-damage-tolerance nature of existing 3D-printed ceramics. |
| Databáze: | OpenAIRE |
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