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尽管人们在实验室模拟贝壳的多级层状结构方面已经取得了显著进步,但在理解生物材料独特的强度和韧性的平衡方面仍然有很大的挑战.本文利用不同维度的组装单元制备了具有高强度和韧性的三元仿贝壳层状多级结构的粘土片/聚乙烯醇/硅酸钙纳米纤维(MTM/PVA/NFX)复合薄膜.这种层状的人工复合薄膜是通过一维的NFX网状层和二维的MTM纳米片层交替堆积而成,制得的MTM/PVA/NFX复合薄膜不但强度高(241.8±10.2MPa),而且韧性好(5.85±0.46 MJ m~(-3)).其数值比一元的NFX网状薄膜和二元的MTM/PVA复合薄膜高出数倍,并且优于传统的二元MTM/聚合物复合薄膜.这可能是由于所制备的复合薄膜中MTM纳米片与NFX纳米纤维产生的协同增强效应所导致的.这种基于组分间协同增强的组装方案为设计和构建新型仿贝壳层状多级结构的复合薄膜提供了一种简单的方法.这种柔性复合膜可望应用于功能涂层、组织工程和膜分离等领域.
Although significant advances have been made in the laboratory to simulate the multilayered structure of shells, there are still significant challenges in understanding the unique balance of strength and toughness of biological materials.In this paper, High strength and tough ternary shell-like multi-layered clay / polyvinyl alcohol / calcium silicate nanofibers (MTM / PVA / NFX) composite film. This layered artificial composite film is a one-dimensional NFX mesh layer and two-dimensional MTM nanosheets alternately stacked, the prepared MTM / PVA / NFX composite film not only has high strength (241.8 ± 10.2 MPa) but also good toughness (5.85 ± 0.46 MJ m -3 )), Which is several times higher than monobasic NFX mesh films and binary MTM / PVA composite films and is superior to conventional binary MTM / polymer composite films, probably due to the fact that in the prepared composite films MTM nanosheets and NFX nanofibers.This assembly approach based on synergistic enhancement of components provides a simple method for designing and constructing new composite films with shell-like multi-layered structure. This flexible composite membrane is expected to be used Functional coatings, tissue engineering and membrane separation.