Inorganic nanocrystal self-assembly via the inclusion interaction of β-cyclodextrins: Toward 3D spherical magnetite

Yanglong Hou, Hiroshi Kondoh, Masatsugu Shimojo, Erika O. Sako, Noriaiki Ozaki, Toshihiro Kogure, Toshiaki Ohta

Research output: Contribution to journalArticlepeer-review

79 Citations (Scopus)


Synthesis and three-dimensional (3D) assembly of magnetite nanocrystals were realized by a one-pot procedure, in which Fe(acac)3 (acac = acetylacetonate) was partly reduced by hydrazine accompanied with ethylene glycol and spontaneously assembled into spherical nanostructures in the presence of surfactants including β-cyclodextrin, oleic acid, and oleylamine. The size of the assembled spheres can coarsely be controlled in a limited range (100 nm to 2 μm) by changing the reaction temperature and the concentration of β-cyclodextrin. X-ray diffraction and far Fourier transform infrared spectroscopy were employed to clarify the structures of magnetite in the assembled spheres. Electron diffraction pattern in a selected-area exhibits a high-crystallinity characteristic of cubic structure magnetite. We found that the formation of spherical magnetite aggregates highly depends on the presence of β-cyclodextrin, while oleic acid and oleylamine improve the morphology of individual magnetite nanoparticles in the assembled spheres. In addition, the thermal gravimetric analysis and differential thermal analysis were applied to determine the content of magnetite in the products. Magnetic properties were also studied by using a superconducting quantum interference device magnetometer.

Original languageEnglish
Pages (from-to)4845-4852
Number of pages8
JournalJournal of Physical Chemistry B
Issue number11
Publication statusPublished - 2005 Mar 24
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry


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