Ślosarczyk Agnieszka
Institute of Building Engineering, Faculty of Civil and Transport Engineering, Poznan University of Technology, Piotrowo 3, 60-965 Poznań, Poland.
Nanomaterials (Basel). 2021 Jan 20;11(2):258. doi: 10.3390/nano11020258.
The article presents the synthesis of silica aerogel from a much cheaper precursor of water glass that was reinforced with short pitch carbon fiber by way of ambient pressure drying. Before being added to the silica gel, the carbon fibers were surface modified to increase adhesion at the interfacial border. We were able to obtain stable structures of the composite with the amount of fibers above 10% by volume. The presence of fibers in the silica matrix resulted in lower synthesis time of the composite, improved adhesion of fibers to the aerogel nanostructure, and increased mechanical and structural parameters. An additional effect of the presence of fibers in excess of 10% by volume was a new function of the nanocomposite-the ability to conduct electric current. The most optimal parameters of the composite, however, were obtained for silica aerogel reinforced with 10 vol.% of carbon fibers. This material indicated relatively low density and good physical parameters. The paper also analyzes the results on the synthesis of fiber-reinforced silica aerogels that have appeared in recent years and compares these to the results gained in presented work.
本文介绍了以水玻璃这种便宜得多的前驱体合成二氧化硅气凝胶，并通过常压干燥用短切沥青碳纤维对其进行增强的方法。在添加到硅胶之前，对碳纤维进行了表面改性，以增加界面处的附着力。当纤维体积含量超过10%时，我们能够获得复合材料的稳定结构。二氧化硅基体中纤维的存在缩短了复合材料的合成时间，改善了纤维与气凝胶纳米结构的附着力，并提高了机械和结构参数。纤维体积含量超过10%还产生了一个额外的效果，即纳米复合材料具有了传导电流的新功能。然而，对于用10体积%的碳纤维增强的二氧化硅气凝胶，获得了复合材料的最佳参数。这种材料具有相对较低的密度和良好的物理参数。本文还分析了近年来出现的纤维增强二氧化硅气凝胶的合成结果，并将其与本研究获得的结果进行了比较。
