Issue 17, 2021

Metamaterial-like aerogels for broadband vibration mitigation


We report a mechanical metamaterial-like behavior as a function of the micro/nanostructure of otherwise chemically identical aliphatic polyurea aerogels. Transmissibility varies dramatically with frequency in these aerogels. Broadband vibration mitigation is provided at low frequencies (500–1000 Hz) through self-assembly of locally resonant metastructures wherein polyurea microspheres are embedded in a polyurea web-like network. A micromechanical constitutive model based on a discrete element method is established to explain the vibration mitigation mechanism. Simulations confirm the metamaterial-like behavior with a negative dynamic material stiffness for the micro-metastructured aerogels in a much wider frequency range than the majority of previously reported locally resonant metamaterials.

Graphical abstract: Metamaterial-like aerogels for broadband vibration mitigation

Supplementary files

Article information

Article type
15 Jan 2021
23 Feb 2021
First published
09 Mar 2021
This article is Open Access
Creative Commons BY license

Soft Matter, 2021,17, 4496-4503

Metamaterial-like aerogels for broadband vibration mitigation

S. Malakooti, M. I. Hatamleh, R. Zhang, T. Taghvaee, M. Miller, Y. Ren, N. Xiang, D. Qian, C. Sotiriou-Leventis, N. Leventis and H. Lu, Soft Matter, 2021, 17, 4496 DOI: 10.1039/D1SM00074H

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