Flame Retardant, Heat Insulating Cellulose Aerogels from Waste Cotton Fabrics by in Situ Formation of Magnesium Hydroxide Nanoparticles in Cellulose Gel Nanostructures
Flame Retardant, Heat Insulating Cellulose Aerogels from Waste Cotton Fabrics by in Situ Formation of Magnesium Hydroxide Nanoparticles in Cellulose Gel Nanostructures
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通过在纤维素凝胶纳米结构中原位形成氢氧化镁纳米颗粒，从废棉织物中制备阻燃、隔热纤维素气凝胶
DOI：
10.1021/acssuschemeng.5b00438
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发表时间：
2015-08-01
影响因子：
8.4
通讯作者：
Lu, Canhui
中科院分区：
文献类型：
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作者：
Han, Yangyang;Zhang, Xinxing;Lu, Canhui
纤维素气凝胶具有低密度、高机械强度和低导热系数等优点，是一种很有前途的环保隔热材料。然而，纤维素气凝胶作为绝热材料在建筑和家用电器中的应用受到其高度易燃特性的阻碍。在这项工作中，阻燃纤维素气凝胶制造从废弃棉织物通过原位合成的氢氧化镁纳米粒子（MH NPs）的纤维素凝胶纳米结构，然后冷冻干燥。我们的研究结果表明，从NaOH/尿素溶液制备的三维纳米多孔纤维素凝胶可以作为骨架/模板的非团聚生长的MH纳米颗粒。所制备的杂化纤维素气凝胶具有优异的阻燃性能，可在40 s内完全熄灭。复合气凝胶的热导率从0.056上升到0.081 W m（-1）k（-1），比表面积从38.8下降到37.6 cm（2）g（-1），表明复合气凝胶保持了纤维素气凝胶优异的隔热性能。由于该方法的概念简单，生物质废物是可持续的，并且容易以低成本获得，因此本方法适合于工业规模生产，并且在未来的绿色建筑材料中具有很大的潜力。
Cellulose aerogels with low density, high mechanical strength, and low thermal conductivity are promising candidates for environmentally friendly heat insulating materials. The application of cellulose aerogels as heat insulators in building and domestic appliances, however, is hampered by their highly flammable characteristics. In this work, flame retardant cellulose aerogels were fabricated from waste cotton fabrics by in situ synthesis of magnesium hydroxide nanoparticles (MH NPs) in cellulose gel nanostructures, followed by freeze-drying. Our results demonstrated that the three-dimensionally nanoporous cellulose gel prepared from the NaOH/urea solution could serve as scaffold/template for the nonagglomerated growth of MH NPs. The prepared hybridized cellulose aerogels showed excellent flame retardancy, which could extinguish within 40 s. Meanwhile, the thermal conductivity of the composite aerogel increased moderately from 0.056 to 0.081 W m(-1) k(-1) as the specific surface area decreased slightly from 38.8 to 37.6 cm(2) g(-1), which indicated that the excellent heat insulating performance of cellulose aerogel was maintained. Because the concepts of the process are simple and biomass wastes are sustainable and readily available at low cost, the present approach is suitable for industrial scale production and has great potential in the future of green building materials.