Aerogels are a novel type of open‐cell porous material. They are particularly suitable for passive sound‐absorption due to their high porosity and high‐surface areas of the internal structures, but with the drawbacks of limited absorption rate of low‐frequency sound and poor mechanical performance. Here, it is first demonstrated that the M13 phage aerogel(M13AG) with hierarchically porous and ribbing structures is beneficial to sound‐absorption and the local piezoelectric effect attributed to M13 phages can further improve the sound‐absorption ability in the low‐frequency. The sound‐absorption coefficient of the M13AG with thickness of 20 mm attains peak value of 0.992 at 1600 Hz. In addition, the M13AG is assembled on a metallic foam framework to enhance its mechanical performance. The resulting M13AG/nickel foam exhibits enhanced compressive yield strength up to 0.14 MPa. This study opens up a new opportunity for passive sound‐absorption.

中文翻译：

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分层结构的M13噬菌体气凝胶，可增强声音吸收

气凝胶是一种新型的开孔多孔材料。由于它们的高孔隙率和内部结构的高表面积，它们特别适合于被动式吸声，但缺点是低频声的吸收率有限且机械性能较差。在这里，首次证明具有分层多孔和肋状结构的M13噬菌体气凝胶（M13AG）有利于吸声，归因于M13噬菌体的局部压电效应可以进一步提高低频的吸声能力。厚度为20 mm的M13AG的吸声系数在1600 Hz时达到0.992的峰值。此外，M13AG组装在金属泡沫框架上，以增强其机械性能。所得的M13AG /镍泡沫显示出高达0.14 MPa的增强的压缩屈服强度。这项研究为被动吸声开辟了新的机会。