科隆电子材料气凝胶 | 科隆材料 | 充电宝隔热材料 | 户外移动电源隔热材料 | 气凝胶隔热保温材料厂家 | 气凝胶 | 隔热材料 | 超低导热 | 气凝胶隔热膜 | 气凝胶隔热材料

研究团队：

Dou L, Zhang X, Cheng X, et al.

研究内容：

二氧化硅气凝胶具有导热系数低、耐热性能好的特点，是一种很有吸引力的隔热材料。然而，具有温度不变超弹性和超低热导率的二氧化硅气凝胶的制备仍然是极具挑战性的。本文以静电纺丝二氧化硅纳米纤维(SNFs)和二氧化硅纳米颗粒气凝胶(SNAs)为基体，以二氧化硅溶胶为高温纳米胶，设计合成了一种分层细胞结构二氧化硅纳米纤维气凝胶。这一途径导致本质上随机沉积的snf组装成纤维细胞结构，SNAs均匀分布在纤维细胞壁上。陶瓷纳米纤维气凝胶独特的分层细胞结构使其具有~ 0.2 mg cm−3的超低密度、负泊松比、超低热导率(23.27 mW m−1 K−1)、从−196°C到1100°C的温度不变超弹性以及大规模可编辑的形状的综合性能。这些有利的多重特性使气凝胶成为工业、航空航天甚至极端环境条件下隔热的理想材料。

Abstract

Silica aerogels are attractive for thermal insulation due to their low thermal conductivity and good heat resistance performance. However, the fabrication of silica aerogels with temperature-invariant superelasticity and ultralow thermal conductivity has remained extremely challenging. Herein, we designed and synthesized a hierarchical cellular structured silica nanofibrous aerogel by using electrospun SiO2 nanofibers (SNFs) and SiO2 nanoparticle aerogels (SNAs) as the matrix and SiO2 sol as the high-temperature nanoglue. This pathway leads to the intrinsically random deposited SNFs assembling into a fibrous cellular structure, and the SNAs are evenly distributed on the fibrous cell wall. The unique hierarchical cellular structure of the ceramic nanofibrous aerogels endows it with integrated performances of the ultralow density of ∼0.2 mg cm-3, negative Poisson's ratio, ultralow thermal conductivity (23.27 mW m-1 K-1), temperature-invariant superelasticity from -196 to 1100 °C, and editable shapes on a large scale. These favorable multifeatures present the aerogels ideal for thermal insulation in industrial, aerospace, and even extreme environmental conditions.

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