Tailoring spontaneous pillar structure using phase-separating organosiloxane sol-gel systems in micro-fabricated grooves

Kazuyoshi Kanamori, Kazuki Nakanishi, Kazuyuki Hirao, Hiroshi Jinnai

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

A sharp transition to pillar structure has been observed in simple sol-gel systems accompanying phase separation inside rectangular-sectioned open grooves which were fabricated on a silica glass chip. The structural variation was investigated using two contrastive systems; one with a rapid sol-gel reaction and the other with a sluggish reaction. In the slower system, transition from web-like bicontinuous structure to pillar structure, we call it as "web-to-pillar transition", occurred when the bulk characteristic length Λ m exceeded the width of the groove D. On the other hand, the transition did not occur in the same condition in the faster system; it occurred when Λ m became much longer than D. A consistent formation mechanism model was also proposed using a relation between interfacial curvatures and pressure.

Original languageEnglish
Pages (from-to)183-191
Number of pages9
JournalJournal of Sol-Gel Science and Technology
Volume35
Issue number3
DOIs
Publication statusPublished - 2005 Sep 1
Externally publishedYes

Keywords

  • Confined geometry
  • Methylsiloxane gel
  • Phase separation
  • Pillar structure
  • Wetting

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Chemistry(all)
  • Biomaterials
  • Condensed Matter Physics
  • Materials Chemistry

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