4.8 Article

Mechanically Reinforced Artificial Enamel by Mg2+-Induced Amorphous Intergranular Phases

期刊

ACS NANO
卷 16, 期 7, 页码 10422-10430

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsnano.2c00688

关键词

biomineralization; enamel-like structures; amorphous intergranular phases; mechanically reinforced arrays; magnesium ion regulation

资金

  1. National Key Research and Development Program of China [2021YFA0715700]
  2. National Natural Science Foundation of China [51832003]
  3. State Key Laboratory of Materials Processing and Die & Mold Technology, Huazhong University of Science and Technology

向作者/读者索取更多资源

This study successfully synthesized an amorphous intergranular phase controlled by Mg2+ and observed the enrichment of Mg2+ at grain boundaries, forming Mg-rich amorphous calcium phosphate. The amorphous intergranular phases act like glue to connect each nanorod, reinforcing the enamel-like arrays. The as-received FAP-M artificial enamel exhibits excellent mechanical properties, with hardness and Young's modulus significantly higher than those without controlled by Mg2+.
Amorphous intergranular phases in mature natural tooth enamel are found to provide better adhesion and could dramatically affect their mechanical performance as a structure reinforcing phase. This study successfully synthesized an amorphous intergranular phase enhanced fluorapatite array controlled by Mg2+ (FAP-M) at room temperature. Furthermore, atom probe tomography (APT) observation presents that Mg2+ is enriched at grain boundaries during the assembly of enamel-like fluorapatite arrays, leading to the formation of intergranular phases of Mg-rich amorphous calcium phosphate (Mg-ACP). APT results also demonstrated that the segregation of Mg2+ caused the chemical gradient in nanocrystalline attachment and realignment under the drive of inherent surface stress. These results indicate that the amorphous intergranular phases served like glue to connect each nanorod to reinforce the enamel-like arrays. Therefore, the as-received FAP-M artificial enamel exhibits excellent mechanical properties, with hardness and Young's modulus of 2.90 +/- 0.13 GPa and 67.9 +/- 3.4 GPa, which were similar to 8.3 and 2.2 times higher than those of FAP arrays without controlled by Mg2+, respectively.

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