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Issue 31, 2013
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Controlling the morphology and pore size of mesostructured silica nanoparticles: the role of the iron oxidation state

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Abstract

We demonstrate morphology and pore size dependence of silica nanoparticles (SNPs) synthesized via control of the iron oxidation state. In the absence of any Fe species, only spherical SNPs are produced, whereas in the presence of Fe3+ and Fe2+ ions, SNPs with rod-like and nanosheet morphologies, respectively, are formed. The average pore size increases from 1.7 nm in the absence of iron to 3.2 and 5.9 nm as Fe3+ and Fe2+, respectively, were used during the synthesis. Both samples of SNPs synthesized in the presence of Fe2+ and Fe3+ have 0.2 wt% of tetrahedral iron in the silica framework, whereas most of the iron is in the silica extraframework, as verified by Mössbauer spectroscopy, UV-vis diffuse reflectance, FTIR, XRD data and TPR analysis. These Fe2+ and Fe3+ cations play a fundamental role in controlling these properties because they change the curvature and the surface charge density of CTAB micelles, thus favoring the spherical to rod-like transition. The rod-like shape was retained in Fe3+-containing samples, whereas a nanosheet-like morphology was produced in Fe2+-containing samples due to the breakage of silica walls during the thermal treatment to remove the template. The control of the textural properties is interesting to allow the fabrication of selective photocatalysts for oxidation of different organic substrates.

Graphical abstract: Controlling the morphology and pore size of mesostructured silica nanoparticles: the role of the iron oxidation state

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Publication details

The article was received on 24 Mar 2013, accepted on 04 Jun 2013 and first published on 05 Jun 2013


Article type: Paper
DOI: 10.1039/C3DT50794G
Dalton Trans., 2013,42, 11271-11280

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    Controlling the morphology and pore size of mesostructured silica nanoparticles: the role of the iron oxidation state

    J. V. Coelho, M. S. Guedes, D. Barrera, K. Sapag, M. C. Pereira and L. C. A. D. Oliveira, Dalton Trans., 2013, 42, 11271
    DOI: 10.1039/C3DT50794G

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