Manufacturing bioinspired flexible materials using ultrasound directed self-assembly and 3D printing
Manufacturing bioinspired flexible materials using ultrasound directed self-assembly and 3D printing
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DOI：
10.1016/j.matdes.2019.108243
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发表时间：
2020-01
影响因子：
8.4
通讯作者：
P. Wadsworth;Isaac Nelson;Debora Lyn Porter;B. Raeymaekers;S. Naleway
中科院分区：
文献类型：
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作者：
P. Wadsworth;Isaac Nelson;Debora Lyn Porter;B. Raeymaekers;S. Naleway
由嵌入在基质材料中的分层微结构组成的生物材料，与相同组成材料的非结构化混合物相比，可以显示出更好的机械或材料性能。在这项工作中，超声波引导的自组装与3D打印(直写(DW))在一种名为“超声波DW”的新制造工艺中相结合，从而能够制造出具有模拟天然材料特性的工程材料。这一工艺允许3D打印原料由液体光聚合树脂和分散的微纤维组成，并能够制造具有排列的碳微纤维线的材料。研究了超声波的工作频率和打印速度对纤维取向、相邻排列的纤维之间的距离以及样品的导电性和力学性能的影响。结果表明，在考虑超声工作频率和打印速度的影响下，材料样品中排列的纤维线在相邻排列的纤维线之间的距离方面显示出统计上的显著差异。排列的纤维线形成局部渗流网络，从而形成导电区。超声波DW工艺允许制造具有可调节特定材料属性的集成子结构的材料。
Biological materials that are composed of hierarchical microstructures embedded in a matrix material can display enhanced mechanical or material properties compared to an unstructured mixture of the same constituent materials. In this work, ultrasound directed self-assembly was integrated with 3D printing (direct-write (DW)) in a new manufacturing process called “ultrasound DW”, to enable the fabrication of engineered materials with properties mimicking those of natural materials. This process allows 3D printing feedstock that consists of a liquid photopolymer resin with dispersed microfibers, and enables fabricating materials with lines of aligned carbon microfibers. The effect of the ultrasound operating frequency and print speed on the alignment of the fibers, distance between adjacent lines of aligned fibers, as well as the resulting electrical conductivity and mechanical properties of the samples were evaluated. The results showed that the lines of aligned fibers in the material samples display statistically significant differences in terms of the distance between the adjacent lines of aligned fibers when looking at the factors of the ultrasound operating frequency and the print speed. The lines of aligned fibers form local percolated networks resulting in electrically conductive areas. The ultrasound DW process allows the fabrication of materials with integrated substructures that tune specific material properties.