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Title: Hematite template route to hollow-type silica spheres

Abstract

Hollow-type silica spheres with controlled cavity size were prepared from Fe{sub 2}O{sub 3}-SiO{sub 2} core-shell composite particles by selective leaching of the iron oxide core materials using acidic solution. The spherical Fe{sub 2}O{sub 3} core particles with a diameter range of 20-400 nm were first prepared by the hydrolysis reaction of iron salts. Next, the Fe{sub 2}O{sub 3}-SiO{sub 2} core-shell particles were prepared by the deposition of a SiO{sub 2} layer onto the surface of Fe{sub 2}O{sub 3} particles using a two-step coating process, consisting of a primary coating with sodium silicate solution and a subsequent coating by controlled hydrolysis of tetraethoxysilicate (TEOS). The Fe{sub 2}O{sub 3} core was then removed by dissolving with acidic solution, giving rise to hollow-type silica particles. Scanning electron microscopy clearly revealed that the cavity size was closely related to the initial size of the core Fe{sub 2}O{sub 3} particle. According to the cross-sectional view obtained by transmission electron microscopy, the silica shell thickness was about 10 nm. The porous texture of the hollow-type silica particles was further characterized by nitrogen adsorption-desorption isotherm measurements. - Graphical abstract: TEM micrograph of the hollow silica particles. Wall thickness, as estimated by TEM from the ring around themore » perimeter of the hollow spheres, was {approx}10 nm. TEM micrographs of hollow silica spheres show that the sphericity of the core Fe{sub 2}O{sub 3} was preserved.« less

Authors:
 [1];  [1];  [1];  [2]
  1. Nanomaterial Laboratory, Nanospace Co. Ltd., Ansan Digital Park 6032, 1123 Singgil-dong, Danwon-gu, Ansan, Gyunggi-do 425-839 (Korea, Republic of)
  2. Department of Applied Chemistry, Hanyang University, Sa-1-dong, Sangnok-gu, Ansan 425-791 (Korea, Republic of)
Publication Date:
OSTI Identifier:
21049534
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 180; Journal Issue: 10; Other Information: DOI: 10.1016/j.jssc.2007.08.016; PII: S0022-4596(07)00331-3; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ADSORPTION; DESORPTION; HEMATITE; HYDROLYSIS; IRON OXIDES; ISOTHERMS; LAYERS; LEACHING; NITROGEN; POROUS MATERIALS; SCANNING ELECTRON MICROSCOPY; SILICA; SILICON OXIDES; SODIUM SILICATES; SOLUTIONS; SPHERICAL CONFIGURATION; SURFACE COATING; SURFACES; TRANSMISSION ELECTRON MICROSCOPY

Citation Formats

Han, Yang-Su, Jeong, Gee-Young, Department of Applied Chemistry, Hanyang University, Sa-1-dong, Sangnok-gu, Ansan 425-791, Lee, Sun-Young, and Kim, Ho-Kun. Hematite template route to hollow-type silica spheres. United States: N. p., 2007. Web. doi:10.1016/j.jssc.2007.08.016.
Han, Yang-Su, Jeong, Gee-Young, Department of Applied Chemistry, Hanyang University, Sa-1-dong, Sangnok-gu, Ansan 425-791, Lee, Sun-Young, & Kim, Ho-Kun. Hematite template route to hollow-type silica spheres. United States. https://doi.org/10.1016/j.jssc.2007.08.016
Han, Yang-Su, Jeong, Gee-Young, Department of Applied Chemistry, Hanyang University, Sa-1-dong, Sangnok-gu, Ansan 425-791, Lee, Sun-Young, and Kim, Ho-Kun. Mon . "Hematite template route to hollow-type silica spheres". United States. https://doi.org/10.1016/j.jssc.2007.08.016.
@article{osti_21049534,
title = {Hematite template route to hollow-type silica spheres},
author = {Han, Yang-Su and Jeong, Gee-Young and Department of Applied Chemistry, Hanyang University, Sa-1-dong, Sangnok-gu, Ansan 425-791 and Lee, Sun-Young and Kim, Ho-Kun},
abstractNote = {Hollow-type silica spheres with controlled cavity size were prepared from Fe{sub 2}O{sub 3}-SiO{sub 2} core-shell composite particles by selective leaching of the iron oxide core materials using acidic solution. The spherical Fe{sub 2}O{sub 3} core particles with a diameter range of 20-400 nm were first prepared by the hydrolysis reaction of iron salts. Next, the Fe{sub 2}O{sub 3}-SiO{sub 2} core-shell particles were prepared by the deposition of a SiO{sub 2} layer onto the surface of Fe{sub 2}O{sub 3} particles using a two-step coating process, consisting of a primary coating with sodium silicate solution and a subsequent coating by controlled hydrolysis of tetraethoxysilicate (TEOS). The Fe{sub 2}O{sub 3} core was then removed by dissolving with acidic solution, giving rise to hollow-type silica particles. Scanning electron microscopy clearly revealed that the cavity size was closely related to the initial size of the core Fe{sub 2}O{sub 3} particle. According to the cross-sectional view obtained by transmission electron microscopy, the silica shell thickness was about 10 nm. The porous texture of the hollow-type silica particles was further characterized by nitrogen adsorption-desorption isotherm measurements. - Graphical abstract: TEM micrograph of the hollow silica particles. Wall thickness, as estimated by TEM from the ring around the perimeter of the hollow spheres, was {approx}10 nm. TEM micrographs of hollow silica spheres show that the sphericity of the core Fe{sub 2}O{sub 3} was preserved.},
doi = {10.1016/j.jssc.2007.08.016},
url = {https://www.osti.gov/biblio/21049534}, journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 10,
volume = 180,
place = {United States},
year = {2007},
month = {10}
}