Hydroxyapatite-reinforced alginate fibers with bioinspired dually aligned architectures

Published on Sep 1, 2021in Carbohydrate Polymers7.182
· DOI :10.1016/J.CARBPOL.2021.118167
Fuqiang Wan (WUT: Wuhan University of Technology), Hang Ping10
Estimated H-index: 10
(WUT: Wuhan University of Technology)
+ 5 AuthorsZhengyi Fu31
Estimated H-index: 31
(WUT: Wuhan University of Technology)
Abstract Biological materials have excellent mechanical properties due to their organized structures from nano- to macro-scale. Artificial manufacture of materials with anisotropic microstructures still remains challenging. We described a stress-induced method to fabricate anisotropic alginate fibers. Organic-inorganic composite fibers were obtained by incorporating aligned hydroxyapatite (HAP) nanowires into the alginate fiber. Detailed structural characterization revealed the bone-like structure of the HAP-reinforced alginate fibers. Tensile test results showed that the maximum Young's modulus and tensile strength were 4.3 GPa and 153.8 MPa, respectively. A multiscale reinforcing mechanism is proposed after the discussion of the structure-property relationship: highly ordered and compacted nanofibrils aligned along the longitudinal direction at the microscale, and two kinds of alginate gels with different mechanical behaviors at the nanoscale coexisted (acidic alginate gel and calcium-alginate gel). This work validates the effectiveness of the bioinspired fabrication strategy, which inspires further manufacturing and optimization of materials for diverse applications.
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