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Malakooti, Sadeq ; Hatamleh, Mohammad I. ; Zhang, Rui ; Taghvaee, Tahereh ; Miller, Max ; Ren, Yao ; Xiang, Ning ; Qian, Dong ; Sotiriou-Leventis, Chariklia ; Leventis, Nicholas ; et al ( , Soft Matter)null (Ed.)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.more » « less
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Malakooti, Sadeq ; Churu, Habel Gitogo ; Lee, Alison ; Xu, Tingge ; Luo, Huiyang ; Xiang, Ning ; Sotiriou-Leventis, Chariklia ; Leventis, Nicholas ; Lu, Hongbing ( , Journal of Non-Crystalline Solids)
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Malakooti, Sadeq ; Churu, Habel Gitogo ; Lee, Alison ; Rostami, Saman ; May, Samuel John ; Ghidei, Suzie ; Wang, Fen ; Lu, Qun ; Luo, Huiyang ; Xiang, Ning ; et al ( , Advanced Engineering Materials)