Oriented nanocrystal mosaic in monodispersed CaCO 3 microspheres with functional organic molecules

Hiroaki Imai, Natsuki Tochimoto, Yuichi Nishino, Yoko Takezawa, Yuya Oaki

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


Monodispersed microspheres of vaterite CaCO 3 with a diameter adjusted to the range of 1-10 μm were produced through an amorphous intermediate with polystyrene sulfate. Whereas the microspheres were composed of nanocrystals with a diameter of ca. 20 nm covered with the organic polymer, the crystallographic direction of the entire sphere was evaluated to be macroscopically uniform from its single-crystalline features on polarization anisotropy and morphological evolution into a hexagonal shape with an additional growth process. A particular mosaic with a radially grown backbone structure consisting of oriented nanocrystals was suggested to exist in the microspheres from the electron diffraction patterns. The rigid mosaic framework was covered with a flexible organic component. Thus, various functional organic molecules including hydrophilic and hydrophobic dyes were successfully introduced into the microspheres due to the amphiphilic nature of the organic phase.

Original languageEnglish
Pages (from-to)876-882
Number of pages7
JournalCrystal Growth and Design
Issue number2
Publication statusPublished - 2012 Feb 1

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


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