Facile synthesis and thermal properties of waterglass-based silica xerogel nanocomposites containing reduced graphene oxide

Kazuma Oikawa, Kei Toyota, Shigeaki Sakatani, Yamato Hayashi, Hirotsugu Takizawa

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

In this study, new rGO-silica xerogel nanocomposites (SX-rGO) and its glass fiber reinforced composites (GFR-SX-rGO) were prepared, and its microstructure and thermal properties were evaluated. The raw material was a mixed dispersion prepared by adding 0.01–2.5 wt% of reduced graphene oxide (rGO) to waterglass (6% SiO2). A hydrogel was prepared via sol-gel reaction of this raw material, which was then immersed in hydrochloric acid, hydrophobized in a siloxane/2-propanol reaction system, and then dried at ambient pressure to obtain a hydrophobic carbon-silica xerogel composite. The obtained samples were characterized by N2 physisorption (at 77 K), solid 29Si Magic angle spinning nuclear magnetic resonance spectroscopy, Fourier-transform infrared spectroscopy, Raman spectroscopy, differential scanning calorimetry, thermogravimetric analysis, hydrophobicity, and thermal conductivity. It was found that as the amount of rGO was increased, the specific surface area of the nanocomposite decreased by ~25% from 535 to 403 cm2/g, and the average pore size and pore volume were almost halved. The thermal decomposition temperature of the SX-rGO was increased markedly by the addition of rGO. Moreover, the GFR-SX-rGO-0.5 showed low density (0.208 g/cm3), high contact angle (146°) and low thermal conductivity (0.0199 W/mK).

Original languageEnglish
Pages (from-to)4201-4207
Number of pages7
JournalCeramics International
Volume45
Issue number4
DOIs
Publication statusPublished - 2019 Mar

Keywords

  • Carbons
  • D.SiO
  • Silica xerogel
  • Thermal properties
  • Waterglass

ASJC Scopus subject areas

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

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