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Influence of supercritical drying fluids on structures and properties of low-density Cu-doped SiO2 composite aerogels

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Abstract

The Cu-doped SiO2 composite aerogels were successfully prepared by sol–gel process and subsequently supercritical drying with ethanol and CO2. The Cu-doped SiO2 composite aerogels had porous texture, low density (<100 mg cm−3) and high specific surface area (>800 m2 g−1), which were investigated by FESEM and nitrogen adsorption desorption porosimetry. The FTIR spectra of the aerogels showed that the ethanol-dried aerogels had been modified by ethyl while the corresponding CO2-dried aerogels had more Si–OH groups. The phase structure and thermal stability were investigated by XRD and TGA, respectively. Due to the reducibility of ethanol, the copper was crystalline in ethanol-dried sample. The Cu-doped SiO2 composite aerogels dried with supercritical ethanol had larger pore diameter and better thermal stability under 400 °C in comparison with CO2-dried composite aerogels. The structures and properties of Cu-doped SiO2 composite aerogels are obviously affected by supercritical drying conditions. The effect research could instruct the synthesis of different state of Cu in composite aerogels.

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Acknowledgments

The financial support for this research from the Science and Technology Development Foundation of China Academy of Engineering Physics (2012A0302015, 2012B0302050) and Innovation Foundation of China Academy of Engineering Physics are gratefully acknowledged.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, People’s Republic of China

    Yin Gao, Geng Chen & Lin Zhang

  2. Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, 621900, People’s Republic of China

    Yin Gao, Geng Chen, Zhijun We, Bowei Chen, Chuangchuang Huang, Xuan Luo, Ruizhuang Yang & Lin Zhang

  3. Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology and Research Center of Laser Fusion, CAEP, Mianyang, 621010, People’s Republic of China

    Yin Gao, Geng Chen, Yutie Bi & Lin Zhang

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  1. Yin Gao
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  2. Geng Chen
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  9. Lin Zhang
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Correspondence to Lin Zhang.

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Gao, Y., Chen, G., We, Z. et al. Influence of supercritical drying fluids on structures and properties of low-density Cu-doped SiO2 composite aerogels. J Sol-Gel Sci Technol 69, 407–411 (2014). https://doi.org/10.1007/s10971-013-3234-z

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  • DOI: https://doi.org/10.1007/s10971-013-3234-z

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