Ultralight\nand Resilient Electrospun Fiber Sponge\nwith a Lamellar Corrugated Microstructure for Effective Low-Frequency\nSound Absorption

Abstract

Low-density\n3D ultrafine fiber assemblies obtained from direct\nelectrospinning enable promising applications in sound absorption\nfields but are often hindered by their poor structure stability. Here,\nwe demonstrate an electrospun ultrafine fiber sponge with a microstructure-derived\nreversible elasticity and high sound absorption property, which is\nachieved by designing a hierarchical lamellar corrugated architecture\nthat functioned as elastic units. The obtained electrospun fiber sponge\ncan quickly recover to the original height even under the distortion\nfrom burdens 8900 times its weight. Particularly, the material can\nmaintain its structural stability after 100 cycles at 60% strain.\nMoreover, the initial hierarchical structure and hydrophobicity of\nthe prepared materials endow them with an ultralight property (density\nof 6.63 mg cm^–3), superior low-frequency sound absorption,\nand excellent performance maintenance. The successful synthesis of\nthese fascinating materials may provide new insights into the design\nof lightweight and efficient sound absorption materials.