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Comparative studies on the physicochemical properties of in-situ hydrophobic silica aerogels by ambient pressure drying method

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Abstract

Hydrophobic SiO2 aerogels show great promise for diverse smart applications due to their superhydrophobic surfaces combined with low thermal conductivity property. Hydrophobic tetraethoxysilane (TEOS)/methyltrimethoxysilane (MTMS) (TM) and TEOS/methyltriethoxysilane (MTES) (TE) gels were prepared by in-situ technique, and dried by ambient pressure drying (APD). The evolution of microstructure and chemical-physical properties of the TM and TE aerogels treated by different temperatures were investigated. Under the ultra-low and high temperature treatment, the TM and TE aerogels showed the low thermal conductivity (0.020 ~ 0.031 W m− 1 K− 1), high specific surface area (410.85 ~ 830.10 m2 g− 1) and good hydrophobicity with the water contact value from 124.2 ~ 155.7°. This work provided an effective method to prepare hydrophobic SiO2 aerogels with excellent ultra-low, high temperature resistant using double silicon sources as co-precursors, which could be an appropriate candidate for thermal insulation, catalysis and environmental protection.

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Acknowledgements

The authors gratefully acknowledge support from the Key Research and Development Project of Jiangsu Province BE2021134, BE2019734), National Natural Science Foundation of China (52202367, 52102361), Natural Science Foundation of Jiangsu Province (BK20200827, BK20200711) and Key Laboratory of Advanced Functional Composites Technology (6142906210508). Natural Science Foundation of Jiangsu Province (BK20200827), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), China. Any opinions, findings, and conclusions or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of these programs.

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Authors and Affiliations

  1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 210009, China

    Shengyuan Wang, Zhixiang Zhu, Ya Zhong, Sheng Cui & Xiaodong Shen

  2. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing, 210009, China

    Shengyuan Wang, Zhixiang Zhu & Ya Zhong

  3. Jiangsu Anjia Advanced Material Technology Co., LTD, Suqian, 223800, China

    Ya Zhong, Jun Gao & Feng Jing

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  1. Shengyuan Wang
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Contributions

Ya Zhong: Conceptualization, Data curation, Investigation, Methodology, Writing-original draft. Shengyuan Wang: Conceptualization, Methodology. Zhixiang Zhu: Investigation, Writing-review & editing. Jun Gao: Software, Supervision. Feng Jing: Supervision, Writing-review & editing, Funding acquisition. Sheng Cui: Supervision, Resources. Xiaodong Shen: Supervision, Formal analysis. All authors reviewed the manuscript.

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Correspondence to Ya Zhong.

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Wang, S., Zhu, Z., Zhong, Y. et al. Comparative studies on the physicochemical properties of in-situ hydrophobic silica aerogels by ambient pressure drying method. J Porous Mater 30, 2043–2055 (2023). https://doi.org/10.1007/s10934-023-01486-4

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