Silica aerogel are the most common aerogels, which are noncombustible materials with high thermal insulation. However, their low mechanical properties and dimensional instability limit their application, as they are very easily susceptible to fractures and cracks during processing and use. On the basis of these assumptions, this work addresses the development of hybrid aerogels based on silica matrix and reinforced with different levels of cellulose nanofibers, dried by supercritical extraction, using carbon dioxide as the solvent. The main results indicate that the incorporation of cellulose nanofibers assists in the dimensional stability of the aerogel, increases the mechanical strength and without significantly changing the density, and does not harm significantly the thermal insulation property.

二氧化硅气凝胶是最常见的气凝胶，是具有高隔热性的不可燃材料。然而，它们的低机械性能和尺寸不稳定性限制了它们的应用，因为它们在加工和使用过程中很容易受到破裂和裂纹的影响。基于这些假设，这项工作解决了基于二氧化硅基质并用不同含量的纤维素纳米纤维增强的混合气凝胶的开发，并使用二氧化碳作为溶剂通过超临界萃取进行干燥。主要结果表明，纤维素纳米纤维的加入有助于气凝胶的尺寸稳定性，增加机械强度，而不会显着改变密度，并且不会显着损害隔热性能。