Bioprocess-Inspired Room-Temperature Synthesis of Enamel-like Fluorapatite/Polymer Nanocomposites Controlled by Magnesium Ions
2021
Li, Yidi | Ping, Hang | Wei, Jingjiang | Zou, Zhaoyong | Zhang, Pengchao | Xie, Jingjing | Jia, Yuhang | Xie, Hao | Wang, Weimin | Wang, Kun | Fu, Zhengyi
Tooth enamel is composed of arrayed fluorapatite (FAP) or hydroxyapatite nanorods modified with Mg-rich amorphous layers. Although it is known that Mg²⁺ plays an important role in the formation of enamel, there is limited research on the regulatory role of Mg²⁺ in the synthesis of enamel-like materials. Therefore, we focus on the regulatory behavior of Mg²⁺ in the fabrication of biomimetic mineralized enamel-like structural materials. In the present study, we adopt a bioprocess-inspired room-temperature mineralization technique to synthesize a multilayered array of enamel-like columnar FAP/polymer nanocomposites controlled by Mg²⁺ (FPN-M). The results reveal that the presence of Mg²⁺ induced the compaction of the array and the formation of a unique Mg-rich amorphous-reinforced architecture. Therefore, the FPN-M array exhibits excellent mechanical properties. The hardness (2.42 ± 0.01 GPa) and Young’s modulus (81.5 ± 0.6 GPa) of the as-prepared FPN-M array are comparable to those of its biological counterparts; furthermore, the enamel-like FPN-M array is translucent. The hardness and Young’s modulus of the synthetic array of FAP/polymer nanocomposites without Mg²⁺ control (FPN) are 0.51 ± 0.04 and 43.5 ± 1.6 GPa, respectively. The present study demonstrates a reliable bioprocess-inspired room-temperature fabrication technique for the development of advanced high-performance composite materials.
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