Thermal Behavior and Coloration Study of Silica-Coated α-Fe2O3 and β-FeOOH Nanocapsules
This manuscript reports characterization of the colorations and thermal behaviors of the silica-coated α-Fe2O3 and β-FeOOH nanocapsules. Prepared β-FeOOH and α-Fe2O3 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-Fe2O3 nanoparticles were
heated to 1000 °C, show a hematite (α-Fe2O3) structure. The silica-coated β-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-Fe2O3 are lower than those of the silica-coated α-Fe2O3 nanostructures. On the other hand, the silica-coated α-Fe2O3 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.
Keywords: ALPHA-FE2O3; BETA-FEOOH; COLORATION; SILICA COATING
Document Type: Research Article
Publication date: 01 July 2011
- Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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