Gao Weiwei, Wang Mengning, Bai Hao
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, China.
State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China.
J Mech Behav Biomed Mater. 2020 Sep;109:103820. doi: 10.1016/j.jmbbm.2020.103820. Epub 2020 Apr 25.
Nacre has achieved an excellent combination of strength and toughness through its unique brick-and-mortar structure of layered aragonite platelets bonded with biopolymers. Mimicking nacre has been considered as a practical way for the development of high-performance structural composites. Over the past years, many techniques have been developed to fabricate multifunctional nacre-mimetic materials, including freeze casting, layer-by-layer assembly, vacuum filtration, 3D printing and so on. Among them, freeze casting, especially bidirectional freeze casting, as an environmentally friendly and scalable method, has attracted extensive attention recently. In this review, we begin with the introduction and discussion of various fabrication techniques comparing their advantages and disadvantages, focusing on the most recent advances of the bidirectional freeze casting technique. Then, we summarize representative examples of applying the bidirectional freeze casting technique to assemble various building blocks into multifunctional nacre-mimetic materials and their wide applications. At the end, we discuss the future direction of using bidirectional freeze casting to make nacre-mimetic materials.
珍珠层通过其独特的由层状文石薄片与生物聚合物结合而成的砖-泥结构，实现了强度与韧性的优异结合。模仿珍珠层被认为是开发高性能结构复合材料的一种实用方法。在过去几年中，已经开发出许多技术来制造多功能仿珍珠层材料，包括冷冻铸造、逐层组装、真空过滤、3D打印等。其中，冷冻铸造，尤其是双向冷冻铸造，作为一种环境友好且可扩展的方法，最近受到了广泛关注。在这篇综述中，我们首先介绍和讨论各种制造技术，比较它们的优缺点，重点关注双向冷冻铸造技术的最新进展。然后，我们总结了将双向冷冻铸造技术应用于将各种构建块组装成多功能仿珍珠层材料及其广泛应用的代表性实例。最后，我们讨论了使用双向冷冻铸造制造仿珍珠层材料的未来方向。
