Although natural biological materials are composed of common materials such as calcium carbonate and calcium phosphate, they often have complex assembly superstructures and outstanding performance that meet their environmental and functional needs, providing people with inspiration and guidance for material structure design and performance optimization. For example, shells are "brick cement layered ordered structures" assembled from calcium carbonate and a small amount of chitin composite materials, and bones are ordered structures assembled from hydroxyapatite nanocrystals / collagen fibers. Nanomaterials have attracted great interest and attention because of their unique physical and chemical properties. However, it is often difficult to optimize the performance of macroscopic bulk materials formed by random random stacking of nanostructure units. Although mimicking natural biological materials has proven to be an ideal strategy for building high-performance materials, how to achieve precise and orderly self-assembly of nanostructured units is still a big challenge.
Recently, the research team led by Zhu Yingjie, a researcher at the Shanghai Institute of Ceramics, Chinese Academy of Sciences, based on the research work on the rapid preparation of highly ordered flexible biomaterials by self-assembly of single-phase hydroxyapatite ultra-long nanowires (Feng Chen, Ying-Jie Zhu *, ACS Nano, 2016, 10, 11483–11495), prepared the quasi-liquid crystal slurry of hydroxyapatite ultra-long nanowires / sodium polyacrylate, and then injected the slurry into ethanol through a simple needle injection method. Developed a high-performance bionic flexible composite fiber with both hydroxyapatite ultra-long nanowire ordered array structure and "brick cement layered ordered structure". This bionic composite fiber with both "brick cement layered ordered structure" and highly ordered array structure of hydroxyapatite ultra-long nanowires has good flexibility and can be knotted, bent or twisted without damaging it Structural integrity. More importantly, the good structural design makes the bionic ordered structure flexible composite fiber have excellent mechanical properties, its tensile strength and Young's modulus reach 203.58 MPa and 24.56 GPa, which are superior to natural dense bone and literature The reported hydroxyapatite composite material. In addition, by introducing magnetic nanoparticles or fluorescent dyes, the scientific research team also developed ordered structured flexible composite fibers with magnetic responsiveness or fluorescent functions. The prepared hydroxyapatite ultra-long nanowire-based ordered structure composite fiber is expected to be used as a raw material to construct various high-performance flexible bionic materials, and has good application prospects in many fields. Related research results were published in the international journal "American Chemical Society-Nano" (Ri-Long Yang, Ying-Jie Zhu *, Fei-Fei Chen, Dong-Dong Qin, Zhi-Chao Xiong *, ACS Nano, 2018, 12, 12284 –12295).
In addition, inspired by natural enamel, the research team also developed a bottom-up multi-scale self-assembly strategy and developed a new type of resin-reinforced hydroxyapatite ultra-long nanowire-based highly ordered enamel-like structural material. The method can realize multi-scale (from nanometer to micrometer to macroscale) self-assembly, prepare large-scale (cm-level) and arbitrary shape highly ordered structural bionic materials with excellent mechanical properties, and have biomedical fields such as bone defect repair Good application prospects. Related research results were published in the international academic journal "Chemical Engineering Journal" (Han-Ping Yu, Ying-Jie Zhu *, Bing-Qiang Lu *, Chemical Engineering Journal, 2019, 360, 1633–1645).
Related research work was supported by the National Natural Science Foundation of China and Shanghai Science and Technology Commission.
High-performance bionic flexible composite fiber with both hydroxyapatite ultra-long nanowire ordered array structure and "brick cement layered structure".
The hydroxyapatite ultra-long nanowire ordered structure bionic flexible composite fiber has excellent mechanical properties.
Functionalized hydroxyapatite ultra-long nanowires ordered structure bionic flexible composite fiber and fabrics, various colors, specific shapes and characters.
Bottom-up multi-scale self-assembly method to prepare large-size (greater than 6 cm) resin-reinforced hydroxyapatite ultra-long nanowire-based highly ordered structural enamel-like materials.
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