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Enhancing thermal safety of hydrophobic silica aerogels by incorporating sodium dodecyl sulfate intercalated layered double hydroxides

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Abstract

To enhance the thermal safety and preserve the excellent thermal insulation of hydrophobic silica aerogels (SA), sodium dodecyl sulfate (SDS) intercalated layered double hydroxides (LDH) was incorporated into SA by in situ doping to form SDS-LDH/SA composites. The intercalation modification by SDS extends the layer spacing of LDH and improves the dispersibility of LDH in SA, in favor of the combination between LDH and SA. The physical combination between the SA and SDS-LDH is demonstrated by FTIR analyses. As the content of SDS-LDH rises, the SDS-LDH/SA continues to exhibit a low density (0.11–0.20 g/cm3), low thermal conductivity (<26.8 mW/m/K), and large specific surface area (709.4–839.2 m2/g), ensuring excellent thermal insulation performance. It further finds that the SDS-LDH effectively absorbs heat and inhibits the thermal decomposition of SA. Therein, the onset temperature of thermal decomposition of the SA with 20% SDS-LDH is 114.0 °C higher than that of pure SA. Additionally, it also finds that the gross calorific values of the SDS-LDH/SA decrease with the SDS-LDH content, and all these gross calorific values are lower than that of the pure SA. Hence, SDS intercalated LDH presents significant effects on enhancing the thermal safety of hydrophobic SA without impairing the thermal insulation too much.

Graphical Abstract

Highlights

  • SDS intercalated LDH was incorporated into SA by in-situ doping to form SDS-LDH/SA composites.

  • The intercalation modification by SDS not only increases the interlayer spacing of LDH but also improves the dispersion of LDH in matrix materials.

  • The addition of SDS-LDH has no significant effect on the excellent thermal insulation properties of SA and effectively improves the thermal safety of SA.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (Nos. 52274248 and 51904336). This work was also supported in part by the High Performance Computing Center of Central South University.

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Authors and Affiliations

  1. School of Resource and Safety Engineering, Central South University, Changsha, 410083, China

    Zhi Li, Min Hu, Kai Shen, Fang Zhou, Qiong Liu & Xiaoxu Wu

  2. Department of Engineering Technology and Application, The Army Infantry College of PLA, Nanchang, 330103, China

    Zhenkui Chen

  3. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, 230027, China

    Xudong Cheng

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Writing—original draft: Min Hu and Zhi Li; Writing—review and editing: Xiaoxu Wu, Fang Zhou, Xudong Cheng, Qiong Liu, Zhenkui Chen and Zhi Li; Visualization: Min Hu and Kai Shen; Investigation: Min Hu; Supervision and funding acquisition: Zhi Li. All authors have read and agreed to the published version of the manuscript.

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Li, Z., Hu, M., Shen, K. et al. Enhancing thermal safety of hydrophobic silica aerogels by incorporating sodium dodecyl sulfate intercalated layered double hydroxides. J Sol-Gel Sci Technol (2024). https://doi.org/10.1007/s10971-024-06379-9

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