Normal photochromism of spiropyran in montmorillonite interlayer

Naoki Saso, Takashi Yamamoto, Yasushi Umemura, Yasuaki Einaga

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Spiropyran-montmorillonite hybrid materials have been fabricated by the Langmuir-Blodgett (LB) and an intercalation method. The LB method using clay minerals could be applied to fabricate hybrid ultrathin films consisting of a non-amphiphilic spiropyran. It is confirmed that hybrid LB films possess the layered structure and exhibit "normal photochromism" without any changes in the layered structure. In case of the intercalation method, hybrid compounds also possess the layered structure. Interestingly, intercalation hybrid compounds exhibit "reverse photochromism". It is suggested that a different process in formation of the layered structure influences the observed photochromism.

Original languageEnglish
Pages (from-to)309-315
Number of pages7
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Issue number1-3
Publication statusPublished - 2008 Mar 20


  • Clay mineral
  • Intercalation method
  • Langmuir-Blodgett method
  • Photochromism
  • Spiropyran

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry


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