期刊
NATURE MATERIALS
卷 15, 期 4, 页码 438-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT4561
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- Robert Bosch-Foundation
The strength of lightweight mechanical metamaterials, which aim to exploit material-strengthening size effects by their microscale lattice structure, has been limited by the resolution of three-dimensional lithography technologies and their restriction to mainly polymer resins. Here, we demonstrate that pyrolysis of polymeric microlattices can overcome these limitations and create ultra-strong glassy carbon nanolattices with single struts shorter than 1 mu m and diameters as small as 200 nm. They represent the smallest lattice structures yet produced-achieved by an 80% shrinkage of the polymer during pyrolysis-and exhibit material strengths of up to 3 GPa, corresponding approximately to the theoretical strength of glassy carbon. The strength-to-density ratios of the nanolattices are six times higher than those of reported microlattices. With a honeycomb topology, effective strengths of 1.2 GPa at 0.6 g cm(3) are achieved. Diamond is the only bulk material with a notably higher strength-to-density ratio.
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