Hu Yong, Guo Zipeng, Ragonese Andrew, Zhu Taishan, Khuje Saurabh, Li Changning, Grossman Jeffrey C, Zhou Chi, Nouh Mostafa, Ren Shenqiang
Department of Mechanical and Aerospace Engineering, The State University of New York at Buffalo, Buffalo, NY 14260.
Department of Industrial and Systems Engineering, The State University of New York at Buffalo, Buffalo, NY 14260.
Proc Natl Acad Sci U S A. 2020 Nov 3;117(44):27204-27210. doi: 10.1073/pnas.2013934117. Epub 2020 Oct 19.
Molecular ferroelectrics combine electromechanical coupling and electric polarizabilities, offering immense promise in stimuli-dependent metamaterials. Despite such promise, current physical realizations of mechanical metamaterials remain hindered by the lack of rapid-prototyping ferroelectric metamaterial structures. Here, we present a continuous rapid printing strategy for the volumetric deposition of water-soluble molecular ferroelectric metamaterials with precise spatial control in virtually any three-dimensional (3D) geometry by means of an electric-field-assisted additive manufacturing. We demonstrate a scaffold-supported ferroelectric crystalline lattice that enables self-healing and a reprogrammable stiffness for dynamic tuning of mechanical metamaterials with a long lifetime and sustainability. A molecular ferroelectric architecture with resonant inclusions then exhibits adaptive mitigation of incident vibroacoustic dynamic loads via an electrically tunable subwavelength-frequency band gap. The findings shown here pave the way for the versatile additive manufacturing of molecular ferroelectric metamaterials.
分子铁电体结合了机电耦合和电极化率，在依赖刺激的超材料领域展现出巨大潜力。尽管前景广阔，但目前机械超材料的物理实现仍因缺乏快速成型的铁电超材料结构而受阻。在此，我们提出一种连续快速打印策略，通过电场辅助增材制造，在几乎任何三维（3D）几何形状中对水溶性分子铁电超材料进行体积沉积，并实现精确的空间控制。我们展示了一种由支架支撑的铁电晶格，它能够实现自我修复，并具有可重新编程的刚度，可对机械超材料进行动态调谐，且具有长寿命和可持续性。然后，一种带有谐振内含物的分子铁电结构通过电可调亚波长频段间隙，实现了对入射振动声动态载荷的自适应减轻。此处所示的研究结果为分子铁电超材料的多功能增材制造铺平了道路。
