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

Abstract

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.

Flexible Ceramic Nanofibrous Aerogels with Hierarchically Entangled Graphene Networks Enable Full-Frequency Noise Absorption

“…Noise reduction coe cient (NRC), the average value of absorption coe cients in 250, 500, 1000, and 2000 Hz, is usually used to appraise the noise absorption materials. 11,12,27 The NRC of the GCNAs with increasing GO loading amounts were 0.19, 0.21, 0.27, and 0.26, respectively (Fig. 3l-m), which was consistent with ow resistance.…”

“…[7][8][9] To address this problem, it is necessary to increase the thickness or density of the brous materials, while which in turn lead to high weights (>50 mg cm -3 ) and decreasing consumption of high-frequency sound waves. [10][11][12] Moreover, the vehicle's space left for sound-absorbing materials is limited, and increasing the density will improve fuel consumption, which violates the principle of energy saving. Most importantly, the ammable characteristic of synthetic brous sound-absorbing materials gives rise to poor thermostability, which is dangerous especially using near the engine and hood.…”

Bottom‐Up Ecofriendly Strategy for Construction of Sustainable Bacterial Cellulose Bioaerogel with Multifunctional Properties

“…Furthermore, the fiber vibration caused by the sound waves may also play an important role in sound absorption. [ 29 ] In a word, acoustic waves moved through porous BC bioaerogels and then were efficiently dissipated because the diffuse refraction or reflection would occur when they entered through these hierarchical pores and channels, and the sound waves are effectively attenuated. [ 30 ] This verifies that the BC bioaerogels are promising candidates as sound‐absorbing engineering materials.…”

Multichannel and Super-flexible SiZrOC Ultrafine Fibers for High Temperature Thermal Insulation

“…Ceramic fibers are considered as promising high temperature thermal insulators due to their outstanding fire resistance, high strength, as well as thermal and chemical resistance [6][7][8][9]. They can be used as both individual thermal insulators and reinforcements and opacifier of aerogel thermal insulators, which are both urgently demanded in the high temperature thermal insulation fields [9][10][11][12]. However, the thermal conductivities of the current ceramic fiber membranes are still high at high temperatures (>0.20 W m -1 •K -1 at 1000 ºC), because of these kinds of fibers are transparent in the infrared (IR) region or have high intrinsic solid thermal conductivity [13][14][15][16][17].…”