Bioinspired Enzymatic Mineralization Incorporates CaCO3 Mesocrystals in Wood for Surface Reinforcement and Flame-Retardancy
Bioinspired Enzymatic Mineralization Incorporates CaCO3 Mesocrystals in Wood for Surface Reinforcement and Flame-Retardancy
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仿生酶矿化在木材中掺入 CaCO3 介晶，用于表面增强和阻燃
DOI：
10.1021/acssuschemeng.2c05094
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发表时间：
2022-11
影响因子：
8.4
通讯作者：
Yuan Jiang
中科院分区：
文献类型：
--
作者：
Tian Fei;Han-Jing Yi;Robert Zboray;Xiao-Qiang Yan;Si-Si Song;Lei Ren;Huizhang Guo;Yuan Jiang
将木材与优异的机械和阻燃性能结合起来的可持续发展战略的发展越来越有吸引力，以将这种可再生工程材料与多种新兴应用联系起来。受生物矿化对软组织的保护作用的启发，我们开发了酶矿化在木材车厢中沉积碳酸钙矿物。导管和纤维中的固定化脲酶增加了碳酸氢根阴离子的局部浓度，这与钙离子的定向扩散一起，导致钙化CaCO3矿物优先沉积在靠近木材表面的细胞室中。聚合物添加剂的使用确保了多阶段矿化开始于面向管腔的细胞壁表面，并且在多轮酶促矿化后管腔中的局部空间填充有介晶CaCO3沉积物。棒状CaCO3介晶的掺入导致矿化木材具有改善的表面硬度和阻燃性，而在同一时间，适度的掺入水平保留了木材固有的轻质优点。这种生物启发的酶矿化方法可以调节功能性矿物的定位和结构，以可持续的方式制造高性能矿化木材。
The development of sustainable strategies for the integration of wood with excellent mechanical and fire-retardant properties is increasingly appealing to bridge this renewable engineering material with multiple emerging applications. Inspired by biomineralization on soft tissues for a protective function, we developed enzymatic mineralization for the deposition of CaCO3minerals in wood compartments. The immobilized urease in vessels and fibers increased the local concentration of bicarbonate anions, which, together with the directional diffusion of calcium cations, caused the deposition of calcitic CaCO3mineral preferentially in cellular compartments of cells near the wood surface. The employment of the polymeric additives ensured that multistage mineralization started on the lumen-facing cell wall surfaces, and the local space in the lumina was filled with mesocrystalline CaCO3deposits after multiple rounds of enzymatic mineralization. The incorporation of rod-shaped CaCO3mesocrystals resulted in mineralized wood with improved surface hardness, and flame-retardancy, while at the same time, the moderate incorporation level preserved the intrinsic lightweight merit of wood. This bioinspired enzymatic mineralization approach can regulate the positioning and structure of functional minerals for the fabrication of high-performance mineralized wood in a sustainable manner.
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