Spontaneous Crack Healing in Nanostructured Silica-Based Thin Films

Shun Itoh, Satoshi Kodama, Maho Kobayashi, Shintaro Hara, Hiroaki Wada, Kazuyuki Kuroda, Atsushi Shimojima*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Self-healing materials that can spontaneously repair damage under mild conditions are desirable in many applications. Significant progress has recently been made in the design of polymer materials capable of healing cracks at the molecular scale using reversible bonds; however, such a self-healing mechanism has rarely been applied to rigid inorganic materials. Here, we demonstrate the self-healing ability of lamellar silica-based thin films formed by self-assembly of silica precursors and quaternary ammonium-type surfactants. Specifically, spontaneous healing of cracks (typically less than 1.5 μm in width) was achieved under humid conditions even at room temperature. The randomly oriented lamellar structure with thin silica layers is suggested to play an essential role in crack closure and the reformation of siloxane networks on the fracture surface. These findings will lead to the creation of smart self-healing silica-based materials based on reversible siloxane bonds.

Original languageEnglish
Pages (from-to)10289-10294
Number of pages6
JournalACS Nano
Issue number10
Publication statusPublished - 2017 Oct 24


  • mesostructures
  • self-assembly
  • self-healing
  • siloxane
  • thin films

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)


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