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Progress in Chemistry 2010, Vol. 22 Issue (10): 1892-1900 Previous Articles   Next Articles

• Review •

Preparation of Silica Aerogels via Ambient Pressure Drying

Wu Guoyou1  Cheng Xuan1, 2**   YU Yuxi1, 2   Zhang Ying1, 2   

  1. （1. Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen F J 361005, China; 2. Fujian Key Laboratory of Advanced Materials, Xiamen University, Xiamen F J 361005, China）
  • Received: Revised: Online: Published:
  • Contact: Cheng Xuan E-mail:xcheng@xmu.edu.cn
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Silica aerogels are the lightest materials with a typical interconnected nanostructure. They have received much attention due to their extraordinary properties and their potential applications in many fields. Conventionally silica aerogels have been made by supercritical drying process which is complicated, expensive and unsafe to a certain extent. In order to promote the production of silica aerogels on a large scale and for commercial applications, it is urgently necessary to probe the preparing technique of silica aerogels via ambient pressure drying at a reasonable cost. In recent years, significant developments in the ambient pressure drying technique have been obtained. This article gives an overview of the recent research progresses in preparation methods of silica aerogels via ambient pressure drying technique and the most updated information in preparation of silica aerogel composite materials. Silica aerogel composite materials reinforced by fiber and polymer improve the mechanical properties and further widening the application areas of silica aerogels.

Contents
1 Introduction
2 Drying methods
2.1 Drying principle
2.2 Supercritical drying technique
2.3 Ambient pressure drying technique
3 Studies in silica aerogel composites
3.1 Silica aerogel composites reinforced by fibers
3.2 Silica aerogel composites reinforced by polymers
4 Summarization

Key words: silica aerogels, preparation, ambient pressure drying, composite materials

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