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Dual modification of silica aerogel monoliths

  • Original Paper: Nano- and macroporous materials (aerogels, xerogels, cryogels, etc.)
  • Published:
Journal of Sol-Gel Science and Technology Aims and scope Submit manuscript

Abstract

A facile and versatile method based on hydrolysis and subsequent condensation of silica alkoxides through sol–gel approach is proposed to obtain an internal-hydrophobic and surface-hydrophilic silica aerogel monoliths. Wet gel monoliths were modified in turn by the hydrophobic agent trimethychlorosilane (TMCS) and hydrophilic modifier 3-aminopropylsilanetriol and finished with supercritical CO2 drying. The silica aerogels were characterized by scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FT-IR), water contact angle, and microcomputer-controlled electron universal tests. The characterization on microstructure of prepared internal-hydrophobic and surface-hydrophilic silica aerogel monoliths indicated that the monoliths have a typical network structure with a porous interior, which exhibits hydrophobic performance (Max. contact angle = 137°) and a hydrophilic surface (Min. contact angle = 60°). The dually modified silica aerogel monoliths were coated with a pure acrylic emulsion layer through which the compressive strength was enhanced greatly which proved that the proposed approach is valuable to silica aerogel modification.

Highlights

  • The monoliths have a typical network structure with a porous interior, which exhibits hydrophobic performance (Max. contact angle = 137°), and a hydrophilic surface (Min. contact angle = 60°).

  • The dually modified silica aerogel monoliths were coated with a pure acrylic emulsion layer through which the compressive strength was enhanced greatly.

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Funding

This study was financially supported by the Joint Fund of the National Natural Science Foundation of China and China Academy of Engineering Physics (NSAF) (No. 11076010).

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Authors and Affiliations

  1. Department of Material Science and Engineering, Henan University of Technology, 450007, Zhengzhou, China

    Fang He, Juan Cheng, Xiao-Hua Zhu & Zhen-Tao Qi

  2. Institute of System Engineering, Chinese Academy of Engineering Physics, 621900, Mianyang, China

    Ju-Ying Wu & Yu-Hong Huang

Authors
  1. Fang He
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  2. Juan Cheng
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  3. Ju-Ying Wu
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  4. Yu-Hong Huang
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  5. Xiao-Hua Zhu
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Correspondence to Fang He.

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He, F., Cheng, J., Wu, JY. et al. Dual modification of silica aerogel monoliths. J Sol-Gel Sci Technol 90, 323–329 (2019). https://doi.org/10.1007/s10971-019-04954-z

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  • DOI: https://doi.org/10.1007/s10971-019-04954-z

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