Silica aerogels with high porosity, low density, and unusual three-dimensional network space structure are interesting for various applications. However, there are easily collapsed structures and poor mechanical qualities, which present a great obstacle to their practical applications. Herein, we reported a universal strategy to realize by combining wet-laid glass fiber felt (80 % glass fiber and 20 % hot melt fiber) with silica aerogel to assemble micro-nanopore structures. The results demonstrated that, compared to glass fiber felt (GF), the silica aerogel/glass fiber/hot melt fiber composites (SGMs) increased 0.33 MPa in tensile strength, and sound transmission loss (STL) could be improved by more than 10 dB when the frequency was above 2000 Hz. Besides, SGMs had good thermal stability (375 °C) and excellent thermal insulation with the optimal thermal conductivity coefficient 0.038 W (m k). It can be widely used in the field of sound insulation and thermal insulation.

中文翻译：

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湿法玻纤毡支架二氧化硅复合气凝胶的制备及其力学、声学和热学性能

二氧化硅气凝胶具有高孔隙率、低密度和不寻常的三维网络空间结构，对各种应用都很感兴趣。但其结构易倒塌、力学性能较差，给其实际应用带来了很大障碍。在此，我们报道了一种通用策略，通过将湿法玻璃纤维毡（80％玻璃纤维和20％热熔纤维）与二氧化硅气凝胶相结合来组装微纳米孔结构。结果表明，与玻璃纤维毡（GF）相比，二氧化硅气凝胶/玻璃纤维/热熔纤维复合材料（SGMs）的拉伸强度提高了0.33 MPa，声传输损失（STL）可改善10 dB以上当频率高于2000Hz时。此外，SGM具有良好的热稳定性（375℃）和优异的隔热性能，最佳导热系数为0.038W（mk）。可广泛应用于隔音、隔热领域。