Synthesis of multi-functional porous superhydrophobic trioxybenzene cross-linked silica aerogels with improved textural properties

D. B. Mahadik, Qi Wang, Puttavva Meti, Kyu Yeon Lee, Young Dae Gong, Hyung Ho Park

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3 Citations (Scopus)


The development of organically modified cross-linked silica aerogels with an ordered porous structure and a high surface area is of utmost importance for practical applications. However, practical applications have been limited, as the organic cross-linkers lead to decrease the textural properties due to large phase separation and large size difference between organic and inorganics. Also cross-linkers are not commercially available or are prohibitively expensive. To overcome these, we proposed to use small size organic cross-linker i. e aryl group with three cross-linking sites to minimize phase separation and to obtain ordered silica network. Initially, three cross-linkers are synthesized starting from trihydroxybenzene and tetraethoxysilane using acid catalyst. Further, using these cross-linkers, trioxybenzene cross-linked silica aerogels were prepared by a simple cost-effective sol-gel process. Three different structural isomers of trihydroxybenzene precursors were used to analyze its suitability to obtain cost-effective silica aerogels with high porosity and hydrophobicity. Among these cross-linked silica aerogels, 1,3,5-trihydroxybenzene cross-linked aerogels possess a high surface area (1268 m2/g) and uniform porous morphology with a highly interconnected structure due to symmetry and lower phase separation. It also exhibits low density (0.02431 g/cm3) and low shrinkage, leading to excellent thermal insulation performance with low thermal conductivity (0.061 W/m·K). Also, the cross-linked aerogels are hydrophobic without using silylating reagents. This is helpful for large-scale production of aerogels for thermal applications.

Original languageEnglish
Pages (from-to)17969-17977
Number of pages9
JournalCeramics International
Issue number11
Publication statusPublished - 2020 Aug 1

Bibliographical note

Funding Information:
This work was supported (in part) by the Yonsei University Research Fund (Post Doc. Researcher Supporting Program) of 2018 (project no.: 2018-12-0015 ). This work was supported by the Samsung Research Funding & Incubation Center of Samsung Electronics under Project Number SRFC-TA1703-04 .

Publisher Copyright:
© 2020 Elsevier Ltd and Techna Group S.r.l.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry


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