Thermal behavior and coloration study of silica-coated α-Fe 2O 3 and β-FeOOH nanocapsules

Ri Yu, Yoo Jin Kim, Jae Hwan Pee, Kyung Ja Kim, Woong Kim

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


This manuscript reports characterization of the colorations and thermal behaviors of the silica-coated α-Fe 2O 3 and β-FeOOH nanocapsules. Prepared β-FeOOH and α-Fe 2O 3 nanoparticles were coated with silica using tetraethylorthosilicate (TEOS) and cetyltrimethyl-ammonium bromide (CTAB) as a surface modifier for the comparison of physical properties of both samples. XRD patterns of the silica-coated β-FeOOH and α-Fe 2 by 3 nanoparticles were heated to 1000 °C, show a hematite (α-Fe 2O 3) structure. The silica-coated ev -FeOOH nanoparticles became almost entirely hollow at 1000 °C due to their volume reduction. In addition, the coloration values of the transformation nano capsule α-Fe 2O 3 are lower than those of the silica-coated a-Fe 2O 3 nanostructures. On the other hand, the silica-coated α-Fe 2 10 3 nanoparticles retained their colorations and shapes after being heated to 1000 °C. The morphologies, crystal structures and colorations of the as prepared samples were analyzed by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction and CIE colorimeter.

Original languageEnglish
Pages (from-to)6283-6286
Number of pages4
JournalJournal of Nanoscience and Nanotechnology
Issue number7
Publication statusPublished - 2011 Jul


  • Coloration
  • Silica Coating.
  • α-Fe O
  • β-FeOOH

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics


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