Engineering durable hydrophobic surfaces on porous alumina ceramics using in-situ formed inorganic-organic hybrid nanoparticles

Jianqiang Gu, Junwei Wang, Yanan Li, Xin Xu, Chusheng Chen*, Louis Winnubst

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

11 Citations (Scopus)

Abstract

Hydrophobic surfaces are required for a variety of applications owing to their water repellent and self-cleaning properties. In this work, we present a novel approach to prepare durable hydrophobic surfaces on porous ceramics. A polydimethylsiloxane (PDMS) film was applied to a porous alumina wafer, followed by pyrolysis at 400 °C in a non-oxidizing atmosphere (H2:N2 = 5:95), giving rise to nanoparticles. In these particles, Si, C and O elements formed amorphous networks to which methyl groups that had survived the pyrolysis were bonded. The as-modified porous alumina wafer was hydrophobic with a water contact angle of 136°, which is attributed to the presence of the methyl groups. The hydrophobicity was maintained after immersion in aqueous solutions in a pH range of 2–12 and acetone. The hydrophobicity was also retained after exposure to temperatures as high as 450 °C in an oxidative atmosphere (air) and after mechanical abrasion with sandpaper. The hydrophobic porous alumina ceramics developed in the present study are promising for use as membranes in various separation processes.

Original languageEnglish
Pages (from-to)4843-4848
Number of pages6
JournalJournal of the European Ceramic Society
Volume37
Issue number15
DOIs
Publication statusPublished - 1 Dec 2017

Keywords

  • Alumina
  • Durable hydrophobic surface
  • Inorganic-organic hybrid nanoparticles
  • Polydimethylsiloxane
  • Pyrolysis

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