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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >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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Flame Retardant, Heat Insulating Cellulose Aerogels from Waste Cotton Fabrics by in Situ Formation of Magnesium Hydroxide Nanoparticles in Cellulose Gel Nanostructures

机译：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，从废棉织物中阻燃，隔热纤维素气凝胶

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摘要

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 nanostruc-tures, 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.
机译：低密度，高机械强度和低热导率的纤维素气凝胶是环保隔热材料的有前途的候选者。然而，纤维素气凝胶在建筑和家用电器中作为绝热材料的应用因其高度易燃的特性而受到阻碍。在这项工作中，通过在纤维素凝胶纳米结构中原位合成氢氧化镁纳米颗粒（MH NPs），然后冷冻干燥，由废弃的棉织物制成阻燃纤维素气凝胶。我们的结果表明，由NaOH /尿素溶液制备的三维纳米多孔纤维素凝胶可作为MH NPs非聚集生长的支架/模板。制备的杂化纤维素气凝胶具有优异的阻燃性，可以在40 s内熄灭。同时，随着比表面积从38.8 cm〜2 g〜（-1）略有减小，复合气凝胶的导热系数从0.056适度增加到0.081 W m〜（-1）k〜（-1），表明纤维素气凝胶具有优异的绝热性能。因为该方法的概念很简单，并且生物质废物是可持续的并且容易以低成本获得，所以本方法适合工业规模生产，并且在绿色建筑材料的未来中具有巨大潜力。

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