期刊
NANO LETTERS
卷 23, 期 19, 页码 9011-9019出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.3c02654
关键词
Ambient pressure drying; freeze-cast ceramic; ionic cross-linking; solvent exchange; large-sizesample
This study developed an improved ambient pressure drying strategy to enhance the drying process of freeze-cast ceramics. By exploiting ice etching, ionic cross-linking, and solvent exchange, the strategy can be applied to various ceramic species, metal ions, and freezing techniques. The incorporation of metal ions not only enhances liquid-phase sintering, but also provides customizable coloration and antibacterial properties to the ceramics.
Freeze-casting has been wildly exploited to construct porous ceramics but usually requires costly and demanding freeze-drying (high vacuum, size limit, and supercooled chamber), which can be avoided by the ambient pressure drying (APD) technique. However, applying APD to freeze-cast ceramic based on an aqueous suspension is still challenging due to inert surface chemistry. Herein, a modified APD strategy is developed to improve the drying process of freeze-cast ceramics by exploiting the simultaneous ice etching, ionic cross-linking, and solvent exchange under mild conditions (-10-0 degrees C, ambient pressure). This versatile strategy is applicable to various ceramic species, metal ions, and freezing techniques. The incorporated metal ions not only enhance liquid-phase sintering, producing ceramics with higher density and mechanical properties than freeze-cast counterparts, but also render customizable coloration and antibacterial property. The cost-/time-efficient APD is promising for mass production and even successive production of large-size freeze-cast ceramics that exceed the size of commercial freeze-dryers.
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