The impact of aluminum oxide deposition on the high-temperature resistance of silica aerogels

IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Journal of Sol-Gel Science and Technology Pub Date : 2024-09-21 DOI:10.1007/s10971-024-06547-x
Shuai Gao, Meixu Han, Jinwen Pan, Yang Zhong, Hongyi Jiang
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Abstract

Silica aerogel (SA) was synthesized through the sol-gel process followed by ambient pressure drying, with aluminum-deposited silica aerogel (ASA) subsequently produced via aluminum deposition using an AlCl3·6H2O hydrolysis solution. This study examined the impact of deposition time and calcination temperature on ASA’s characteristics. Compared to the non-aluminum-deposited SA, ASA with 12 h of deposition time (ASA-12h) showcased a significant increase in specific surface area, reaching 675m2 ∙ g−1 at room temperature. Post-calcination at 800 °C and 1000 °C resulted in specific surface areas of 613m2 ∙ g−1 and 265m2 ∙ g−1, respectively, markedly surpassing those of SA (240 m2∙g−1 at 800 °C and 16m2 ∙ g−1 at 1000 °C). The results demonstrate that during the aging process, the deposited aluminum is coated by the aging solution, enabling it to remain stable and distribute uniformly. This deposition not only increases the particle size but also enhances structural stability. Furthermore, the formation of new Si-O-Al bonds improves the thermal stability of the silicon dioxide lattices. These insights pave the way for the industrial production of aerogels that are resistant to high temperatures.

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氧化铝沉积对二氧化硅气凝胶耐高温性的影响
通过溶胶-凝胶工艺合成了二氧化硅气凝胶(SA),然后进行常压干燥,随后使用 AlCl3-6H2O 水解溶液通过铝沉积制得铝沉积二氧化硅气凝胶(ASA)。本研究考察了沉积时间和煅烧温度对 ASA 特性的影响。与未沉积铝的硅酸钠相比,沉积时间为 12 小时的硅酸钠(ASA-12h)的比表面积显著增加,室温下达到 675m2 ∙ g-1。在 800 °C 和 1000 °C 煅烧后,比表面积分别达到 613m2 ∙ g-1 和 265m2 ∙ g-1,明显超过了 SA 的比表面积(800 °C 时为 240 m2∙g-1 ,1000 °C 时为 16m2 ∙ g-1)。结果表明,在老化过程中,沉积的铝被老化溶液包覆,使其保持稳定并均匀分布。这种沉积不仅增大了颗粒尺寸,还增强了结构稳定性。此外,新的 Si-O-Al 键的形成提高了二氧化硅晶格的热稳定性。这些见解为耐高温气凝胶的工业化生产铺平了道路。
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来源期刊
Journal of Sol-Gel Science and Technology
Journal of Sol-Gel Science and Technology 工程技术-材料科学:硅酸盐
CiteScore
4.70
自引率
4.00%
发文量
280
审稿时长
2.1 months
期刊介绍: The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.
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