Ultralight and Hydrophobic Palygorskite-based Aerogels with Prominent Thermal Insulation and Flame Retardancy
Ultralight and Hydrophobic Palygorskite-based Aerogels with Prominent Thermal Insulation and Flame Retardancy
复制标题
具有优异隔热和阻燃性能的超轻疏水凹凸棒石基气凝胶
DOI：
10.1021/acsami.9b20923
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发表时间：
2020-03-11
影响因子：
9.5
通讯作者：
Chen, Jing
中科院分区：
文献类型：
--
作者：
Jin, Huiran;Zhou, Xinyu;Chen, Jing
粘土基气凝胶是一种极具发展前景的保温阻燃材料，但如何获得具有高抗燃性、低导热性、疏水性和机械坚固性的粘土基气凝胶仍是一个难题。在这项工作中，通过与非常小比例的海藻酸盐结合，成功地制造了基于坡缕石的气凝胶，形成了独特的分层介微孔结构。采用乙醇溶液替代法和冷冻干燥工艺制备的气凝胶具有超低密度（0.035 ~ 0.052 g/cm(3)）、实用机械强度（0.7 ~ 2.1 MPa）、导热系数（25 ~ 1000℃）为0.0332 ~ 0.165 W/mK的特点。通过简单的化学气相沉积甲基三甲氧基硅烷（MTMS）来获得气凝胶的疏水性。pal基气凝胶具有良好的耐火性能，其极限氧指数可达90%，耐热性可达1000℃，火焰持续10 min。这种可再生的pal基气凝胶具有3D框架，是一种很有前途的材料，可用于建筑和航空航天领域的隔热和高耐火。
Clay-based aerogel is a promising material in the field of thermal insulation and flame retardant, but obtaining clay- based aerogel with high fire resistance, low thermal conductivity, hydrophobicity, and mechanical robustness remains a challenge. In this work, palygorskite-based aerogel was successfully fabricated via combining with a very small proportion of alginate to form a distinctive hierarchically meso-microporous structure. By employing ethanol solution (EA) replacement method and freeze-drying process, the resultant aerogel exhibited ultralow density (0.035-0.052 g/cm(3)), practical mechanical strengths (0.7-2.1 MPa), and low thermal conductivity of 0.0332-0.165 W/mK (25-1000 degrees C). The hydrophobicity of aerogel was achieved by simple chemical vapor deposition of methyltrimethoxysilane (MTMS). The Pal-based aerogel showed good performance in both fire resistance with high limiting oxygen index up to 90%, and heat resistance with tolerance of flame up to 1000 degrees C for 10 min. This renewable Pal-based aerogel with a 3D framework is a promising material to be applied in fields of construction and aerospace for thermal insulation and high fire resistance.