In-situ acid catalysis strategy to achieve rapid ambient pressure drying preparation of aerogels

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology Pub Date : 2024-08-16 DOI:10.1007/s10971-024-06518-2

Zun Zhao, Yuelei Pan, Mingyuan Yan, Yueyue Xiao, Hui Yang, Xudong Cheng

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Abstract

Aerogel possesses distinctive features rendering it widely applicable in thermal insulation. Nevertheless, supercritical fluid drying (SCFD) method and freeze-drying employed for aerogels necessitates the complex process, resulting in heightened energy consumption and more risk. To achieve the cost-effective preparation of silica aerogel, we introduce an in-situ acid catalysis strategy for rapidly crafting high-performance SiO₂ aerogel materials under ambient conditions. The resultant SiO₂ aerogels exhibit remarkable porosity (95%) and a substantial specific surface area (759 m²/g). Furthermore, SiO₂ aerogel composites display low thermal conductivity (0.015 W·m⁻¹ K⁻¹), coupled with commendable mechanical property. More importantly, we reveal the mechanism of the in-situ acid catalysis (ISAC) strategy. The entire production cycle of SiO₂ aerogel composites and powder is only 6 and 4 h respectively, which greatly reduces the preparation time while ensuring excellent performances. This study introduces a novel approach for the industrial, low-cost, and rapid preparation of SiO₂ aerogel materials through ambient pressure drying.

Graphical Abstract

Abstract Image

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实现气凝胶快速常压干燥制备的原位酸催化策略

气凝胶具有独特的特性，可广泛应用于隔热领域。然而，气凝胶采用的超临界流体干燥（SCFD）法和冷冻干燥法工艺复杂，能耗高，风险大。为了实现经济高效地制备二氧化硅气凝胶，我们引入了一种原位酸催化策略，用于在环境条件下快速制备高性能二氧化硅气凝胶材料。制备出的二氧化硅气凝胶具有显著的孔隙率（95%）和巨大的比表面积（759 m²/g）。此外，二氧化硅气凝胶复合材料还显示出较低的热导率（0.015 W-m-1 K-1）以及值得称赞的机械性能。更重要的是，我们揭示了原位酸催化（ISAC）策略的机理。二氧化硅气凝胶复合材料和粉末的整个生产周期分别仅为 6 小时和 4 小时，在确保优异性能的同时大大缩短了制备时间。本研究介绍了一种通过常压干燥工业化、低成本、快速制备SiO2气凝胶材料的新方法。

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来源期刊

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.