Corrugated paper cardboard provides an everyday example of a lightweight, yet rigid, sandwich structure. Here we present nanocardboard, a monolithic plate mechanical metamaterial composed of nanometer-thickness (25–400 nm) face sheets that are connected by micrometer-height tubular webbing. We fabricate nanocardboard plates of up to 1 centimeter-square size, which exhibit an enhanced bending stiffness at ultralow mass of ~1 g m−2. The nanoscale thickness allows the plates to completely recover their shape after sharp bending even when the radius of curvature is comparable to the plate height. Optimally chosen geometry enhances the bending stiffness and spring constant by more than four orders of magnitude in comparison to solid plates with the same mass, far exceeding the enhancement factors previously demonstrated at both the macroscale and nanoscale. Nanocardboard may find applications as a structural component for wings of microflyers or interstellar lightsails, scanning probe cantilevers, and other microscopic and macroscopic systems.
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机译：瓦楞纸纸板每天都提供轻巧但坚固的三明治结构的示例。在这里，我们介绍了nanocardboard，这是一种由纳米厚度（25-400 nm）的面板组成的整体式平板机械超材料，这些面板通过微米高度的管状织带相连。我们制造的纳米纸板厚达1平方厘米，在〜1lowg m -2 的超低质量下表现出增强的弯曲刚度。即使曲率半径与板的高度相当，纳米级的厚度也可使板在急剧弯曲后完全恢复其形状。与质量相同的实心板相比，最佳选择的几何形状可将弯曲刚度和弹簧常数提高四个数量级以上，远远超过了先前在宏观和纳米尺度上都证明的增强因子。纳米纸板可以作为微型飞行器或星际光帆的机翼，扫描探针悬臂以及其他微观和宏观系统的结构组件而找到应用。
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