Research Progress on Sound Absorption of Electrospun Fibrous Composite Materials

Abstract

Noise is considered severe environmental pollutant that affects human health. Using sound absorption materials to reduce noise is a way to decrease the hazards of noise pollution. Micro/nanofibers have advantages in sound absorption due to their properties such as small diameter, large specific surface area, and high porosity. Electrospinning is a technology for producing micro/nanofibers, and this technology has attracted interest in the field of sound absorption. To broaden the applications of electrospun micro/nanofibers in acoustics, the present study of electrospun micro/nano fibrous materials for sound absorption is summarized. First, the factors affecting the micro/nanofibers’ sound absorption properties in the process of electrospinning are presented. Through changing the materials, process parameters, and duration of electrospinning, the properties, morphologies, and thicknesses of electrospun micro/nanofibers can be controlled. Hence, the sound absorption characteristics of electrospun micro/nanofibers will be affected. Second, the studies on porous sound absorbers, combined with electrospun micro/nanofibers, are introduced. Then, the studies of electrospun micro/nanofibers in resonant sound absorption are concluded. Finally, the shortcomings of electrospun micro/nano fibrous sound absorption materials are discussed, and the future research is forecasted.

Sound Absorption Performance and Mechanical Properties of the 3D-Printed Bio-Degradable Panels

“…In general, the materials used with the FFF process have much lower costs compared to classic technologies (plastic mass injection of components) or additive technologies such as SLS. When sound reaches a barrier, depending on the sound absorption performance of the material, six phenomena can occur: absorption, transmission, reflection, refraction, scattering and diffraction [ 18 ].…”

Enhanced Low Frequency Sound Absorption of Bilayer Nanocomposite Acoustic Absorber Laminated with Microperforated Nanofiber Felt

“…Recently, nanofibers were reported to have been effective in acoustic management, particularly in addressing low frequencies. 7,38,39 Laminating electrospun nanofibrous mats on foams and fibers, blending them with other fibers, changing their spatial structure, and making nanofibrous aerogels expand the contact area of the material with sound waves thereby improves the low-frequency absorption. So in this work, we develop a facile way to address low frequency sounds by producing a nanofiber felt which is then combined with a nanofibrous cryogel responsible for the mid and high frequency sounds to provide wideband absorption.…”

“…Embedding rigid structures in homogeneous porous materials can achieve efficient broadband sound absorption with the disadvantages of a high working frequency and narrow bandwidth. Recently, nanofibers were reported to have been effective in acoustic management, particularly in addressing low frequencies. ,, Laminating electrospun nanofibrous mats on foams and fibers, blending them with other fibers, changing their spatial structure, and making nanofibrous aerogels expand the contact area of the material with sound waves thereby improves the low-frequency absorption.…”

“…From 0.17, the value increased to 0.33 as the nanofiber felt was introduced to the pure cryogel. Nanofibers’ high specific surface area promotes more collisions between the sound waves and the fibers boosting the consumption of acoustic energy as manifested in the absorption coefficient profile of the pure nanofibrous cryogel. ,,− We can verify from the SAC profile of a similar thickness of a commercial polyurethane (PU) foam that the use of nanofibers indeed boosts the acoustic performance of the sound absorbers. PU foam has a maximum coefficient of only 0.33 at 5000 Hz, which when compared to the cryogel shows very poor acoustic performance.…”

The Application of Nanofibrous Resonant Membranes for Room Acoustics

“…Review [ 6 ] presents research on micro/nanofiber materials fabricated by electrospinning for sound absorption. Nanofibers have sound absorption benefits due to their small fiber diameter, high specific surface area, and high porosity.…”