Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, North Carolina, 27695, United States.
Department of Civil, Construction and Environmental Engineering, North Carolina State University, Raleigh, NC, 27695, United States.
Sci Rep. 2017 Aug 22;7(1):9145. doi: 10.1038/s41598-017-09521-6.
We present an engineered nanolattice material with enhanced mechanical properties that can be broadly applied as a thin film over large areas. The nanolattice films consist of ordered, three-dimensional architecture with thin-shell tubular elements, resulting in favorable modulus-density scaling (n ~ 1.1), enhanced energy dissipation, and extremely large material recoverability for strains up to 20% under normal compressive loading. At 95.6% porosity, the nanolattice film has demonstrated modulus of 1.19 GPa and specific energy dissipation of 325.5 kJ/kg, surpassing previously reported values at similar densities. The largest length scale in the reported nanolattice is the 500 nm unit-cell lattice constant, allowing the film to behave more like a continuum material and be visually unobservable. Fabricated using three-dimensional colloidal nanolithography and atomic layer deposition, the process can be scaled for large-area patterning. The proposed nanolattice film can find applications as a robust multifunctional insulating film that can be applied in integrated photonic elements, optoelectronic devices, and microcircuit chips.
我们提出了一种具有增强机械性能的工程纳米晶格材料，可广泛用作大面积薄膜。纳米晶格薄膜由有序的三维结构组成，具有薄壳管状元件，从而实现了有利的模量-密度标度（n~1.1）、增强的能量耗散以及在正常压缩载荷下高达 20%应变的极高材料可恢复性。在 95.6%的孔隙率下，纳米晶格薄膜表现出 1.19 GPa 的模量和 325.5 kJ/kg 的比能量耗散，超过了以前在类似密度下报道的值。所报道的纳米晶格中的最大长度尺度是 500nm 的单元晶格常数，这使得薄膜更像连续体材料，肉眼不可见。使用三维胶体纳米光刻和原子层沉积制造，该工艺可扩展到大面积图案化。所提出的纳米晶格薄膜可作为一种坚固的多功能绝缘薄膜，应用于集成光子元件、光电设备和微电路芯片。
