A novel gradient-pore structure SiO2/SiCnw ceramic composite nanofibrous aerogels for efficient low-frequency noise reduction and thermal insulation

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-09-01 DOI:10.1016/j.ceramint.2025.06.242

Mengmeng Yang , Zhao Zhao , Wei Hu , Lihao Liu , Heng Cai , Hongchao Liu , Bohang An , Min Li , Qiong Wu , Zhaofeng Chen

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引用次数: 0

Abstract

The rapid development of industry and transportation has given rise to serious noise pollution, which posing serious threats to the social economy and human physical and mental health. However, commonly existing fibrous noise absorption materials with single pore-structure are limited by their large density, poor sound absorption ability, which are difficult dissipation of noise at low frequency. Herein, gradient-structured fire-resistance elastic ceramic nanofiber aerogels with dual scale structure at micro and macro levels are success-fully structured through step-by-step directional freeze-casting technology. The macro gradient pore structure improved the noise injection, and self-assembly nano network constructed by SiCnw improved the acoustic contact area of aerogel. In addition, the good thermal conductivity of SiCnw helps to convert sound energy into heat energy and quickly dissipate heat, further improving the sound absorption effect. The noise reduction coefficient of the obtained ceramic fibrous aerogels reaches 0.55, and the maximum value of the sound absorption coefficient can be close to 1. In addition, the hydrophobic group in the binder gives the aerogel good mechanical properties (60 % compressibility) and super hydrophobic properties (water contact angle ≈136°). The successful construction of lightweight, hydrophobic, fire-resistant gradient structure aerogel will provide a new prospect for the upgrading of the next generation noise absorber.

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一种新型的梯度孔结构SiO2/SiCnw陶瓷复合纳米纤维气凝胶，用于高效的低频降噪和隔热

工业和交通的快速发展造成了严重的噪声污染，对社会经济和人类身心健康造成了严重威胁。然而，现有的单孔结构纤维吸声材料密度大，吸声能力差，低频噪声难以消散。本文通过分步定向冷冻铸造技术，成功构建了微观和宏观双尺度结构的梯度结构耐火弹性陶瓷纳米纤维气凝胶。宏观梯度孔结构改善了噪声注入，SiCnw构建的自组装纳米网络提高了气凝胶的声接触面积。此外，SiCnw良好的导热性有助于将声能转化为热能，迅速散热，进一步提高吸声效果。所得陶瓷纤维气凝胶的降噪系数达到0.55，吸声系数最大值可接近1。此外，粘合剂中的疏水性基团使气凝胶具有良好的力学性能（60%的可压缩性）和超疏水性（水接触角≈136°）。轻质、疏水、耐火梯度结构气凝胶的成功构建，将为下一代吸声材料的升级换代提供新的前景。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.