Structure-sound absorption property relationships of electrospun thin silica fiber sheets: Quantitative analysis based on acoustic models

Akasaka, Shuichi; Kato, Takahisa; Azuma, Keisuke; Konosu, Yuichi; Matsumoto, Hidetoshi; Asai, Shigeo

doi:10.1016/j.apacoust.2019.03.016

Cited by 37 publications

(14 citation statements)

References 20 publications

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“…Third, a sound absorption peak can be observed at the frequency of ~1 kHz in the sound absorption curves (Fig. 7b ), which can be attributed to the fiber vibration 63 . The resonant frequency of the SAC sponges at the absorption peak shows a tendency to move to a lower frequency with the increasing thickness, which can be ascribed to the increased areal density of the SAC sponges 64 – 66 .…”

Section: Resultsmentioning

confidence: 94%

Highly compressible and anisotropic lamellar ceramic sponges with superior thermal insulation and acoustic absorption performances

et al. 2020

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Advanced ceramic sponge materials with temperature-invariant high compressibility are urgently needed as thermal insulators, energy absorbers, catalyst carriers, and high temperature air filters. However, the application of ceramic sponge materials is severely limited due to their complex preparation process. Here, we present a facile method for large-scale fabrication of highly compressible, temperature resistant SiO 2-Al 2 O 3 composite ceramic sponges by blow spinning and subsequent calcination. We successfully produce anisotropic lamellar ceramic sponges with numerous stacked microfiber layers and density as low as 10 mg cm −3. The anisotropic lamellar ceramic sponges exhibit high compression fatigue resistance, strain-independent zero Poisson's ratio, robust fire resistance, temperatureinvariant compression resilience from −196 to 1000°C, and excellent thermal insulation with a thermal conductivity as low as 0.034 W m −1 K −1. In addition, the lamellar structure also endows the ceramic sponges with excellent sound absorption properties, representing a promising alternative to existing thermal insulation and acoustic absorption materials.

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Section: Resultsmentioning

confidence: 94%

Highly compressible and anisotropic lamellar ceramic sponges with superior thermal insulation and acoustic absorption performances

et al. 2020

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“…[39] The previous papers have indicated that electrospun nanofiber membranes have higher sound absorption capability than conventional nonwoven fabrics in the low-frequency sound region, [39,40] and they are more like a resonant absorber to convert sound into vibrations with a small proportion of thermal energy resulting from the friction between nanofibers and airflow. [41,42] Increasing fiber fineness significantly increases their vibration velocity, and uniform nanofibers show higher vibration velocity than defect fibers. [21] The vibration deformation caused by sound is the source of charge generation and acoustoelectric conversion of piezoelectric nanofibers.…”

Section: Resultsmentioning

confidence: 99%

High‐Performance Voice Recognition Based on Piezoelectric Polyacrylonitrile Nanofibers

Shao

Wang

Cao

et al. 2021

Adv Elect Materials

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Acoustic sensors show a wide application in diverse fields. However, it is still a challenge to develop highly sensitive transducing materials for the detection of low‐to‐middle decibel sounds. Herein, for the first time the remarkable property of an acoustic sensor based on electrospun polyacrylonitrile (PAN) nanofibers in the recognition of human voices is reported. The nanofiber device shows a sensitivity as high as 23 401 mV P−1 to 70 dB sound, which is much higher than most of the acoustic sensors reported in the literature. First the sounds from different musical instruments are used as a standard sound source to show the high accuracy of the nanofiber device to distinguish different sounds, e.g., from both the same and different instruments, and then people's voices are tested. Experimental results show that the device can distinguish people's voices with high resolution and the influence of background noise on speech recognition is very small. The acoustic sensor is stable and can be used in sound detection for a long time. Electrospun PAN membranes may be useful for the development of voice recognition systems for security, environmental protection, scientific research, and other high‐tech applications.

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“…On one hand, the smaller diameter of PVDF nanofibers increased the number of fibers per unit volume of PFFSs under the same density and thickness, thus resulting in the formation of a large contact area and more tortuous transmission path, which in turn increased the viscous friction of sound waves and improved the air flow resistivity of the PFFSs. [ 5,6,13,56,57 ] Therefore, the loss of low‐frequency sound energy was significantly increased. On the other hand, the addition of finer PVDF nanofibers also reduced the pore size of the PFFSs, which improved the complexity of the channels and enhanced the reflection of low‐frequency sound waves, thus extending the sound transmission length and resulting in more energy losses of the low‐frequency sound wave.…”

Section: Resultsmentioning

confidence: 99%

Interlocked Dual‐Network and Superelastic Electrospun Fibrous Sponges for Efficient Low‐Frequency Noise Absorption

Zong

Cao

et al. 2020

Small Structures

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Traffic noise is a major source of urban noise pollution, with severe threats to the physiological and psychological health of humans. Fibrous sound absorption materials are extensively applied in the control of traffic noise pollution; however, the larger fiber diameters and monotonous internal structure of such materials result in poor low‐frequency sound‐absorbing properties or unsatisfied mechanical properties. Herein, a biomimetic and robust strategy to design ultrastrong and superelastic fibrous sound absorption sponges is reported, which is achieved by integrating a one‐step forming technique of interlocked micro/nano dual fiber networks and an in situ crosslinking approach. The obtained vine‐like interlocked structured fibrous sponges can withstand a tensile force 10 000 times their weight without deformation. Furthermore, the materials also show outstanding compression fatigue resistance and a lightweight feature (8.70 mg cm−3). Most importantly, the interlocked dual‐network‐induced stable fluffy‐stacked structure endows the fibrous sponges with an enhanced low‐frequency sound‐absorbing property (absorption coefficient of 0.93 at 1000 Hz), which is superior to those of commercial and reported sound absorption materials. In addition, the materials also possess good hydrophobicity and temperature resistance. This work opens new pathways for the further development of highly efficient sound‐absorbing materials.

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Structure-sound absorption property relationships of electrospun thin silica fiber sheets: Quantitative analysis based on acoustic models

Cited by 37 publications

References 20 publications

Highly compressible and anisotropic lamellar ceramic sponges with superior thermal insulation and acoustic absorption performances

Highly compressible and anisotropic lamellar ceramic sponges with superior thermal insulation and acoustic absorption performances

High‐Performance Voice Recognition Based on Piezoelectric Polyacrylonitrile Nanofibers

Interlocked Dual‐Network and Superelastic Electrospun Fibrous Sponges for Efficient Low‐Frequency Noise Absorption

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