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Synthesis of homogeneously dispersed cobalt nanoparticles in the pores of functionalized SBA-15 silica
Division of Engineering Materials, Department of Applied Physics and Mechanical Engineering, Luleå University of Technology, Luleå, Sweden..
Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, The Institute of Technology.
Division of Engineering Materials, Department of Applied Physics and Mechanical Engineering, Luleå University of Technology, Luleå, Sweden.
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2012 (English)In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 221, no S1, 359-364 p.Article in journal (Refereed) Published
Abstract [en]

Cobalt nanoparticles were prepared at room temperature by reducing cobalt sulfate heptahydrate with sodium borohydride and using functionalized SBA-15 mesoporous silica as a hard template. It was found that both external and internal fuctionalization of silica walls play a crucial role on the infiltration and reaction of the reagents in the silica framework. Subsequent heat treatment of the impregnated silica at 500 °C in air or nitrogen atmospheres leads to growth of crystals of the deposited cobalt and formation of cobalt and cobalt oxide nanoparticles, respectively. Dissolution of the silica template by NaOH resulted in well dispersed Co and Co3O4 nanoparticles ranging in size from 2 to 4 nm. The functionalization of the silica was studied by FTIR, N2-physisorption, and thermogravimetric techniques and the obtained nanoparticles were characterized by XRD, TEM and EDX analysis.

Place, publisher, year, edition, pages
Elsevier, 2012. Vol. 221, no S1, 359-364 p.
Keyword [en]
Functionalization; Cobalt; Cobalt oxide; Nanoparticles; SBA-15 silica; Sodium borohydride
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-67917DOI: 10.1016/j.powtec.2012.01.025ISI: 000303222300046OAI: oai:DiVA.org:liu-67917DiVA: diva2:414221
Note
funding agencies|Swedish International Development Cooperation Agency, Sida||Available from: 2011-05-02 Created: 2011-05-02 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Synthesis of Mesoporous Silica and their Use as Templates for Metal and Metal Oxide Nanoparticles
Open this publication in new window or tab >>Synthesis of Mesoporous Silica and their Use as Templates for Metal and Metal Oxide Nanoparticles
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis covers the synthesis and characterization of two types of mesoporous silica, SBA-15 silica with two-dimensional hexagonal arrangement, and SBA-16 silica with three-dimensional cubic arrangement. The obtained mesoporous materials were then used as hard templates for synthesizing of different types of nanostructures.

In the first part, the effects of some synthesis parameters on the morphology and texture properties of the mesoporous silica have been studied. By varying the synthesis temperature solid spheres of SBA-16 with different sizes were synthesized and by additions of heptane as a swelling agent, SBA-16 in a hollow-sphere morphology with a large pore size was obtained. In the case of SBA-15, dispersed rods were synthesized in the presence of heptane and NH4F in a low-temperature synthesis. The length of the rods was varied by changing the concentration of HCl, and the pore size was tuned by changing the hydrothermal treatment time and temperature. Furthermore, the reaction time was decreased with a well-retained pore size and morphology. This work has resulted in SBA-15 rods with large pore sizes for this morphology.

In the second part, SBA-15 and SBA-16 silica were used to synthesize different nanostructured materials such as metal and metal oxide nanoparticles. In fact, most of the work in this part is focused on the use of mesoporous silica as hard templates for synthesis of different types of nanoparticles. The synthesis of these nanoparticles was carried out by infiltration of a suitable precursor in the pores of the silica template. The mesoporous frameworks act as molds controlling the size and the final shape of the formed nanostructures. Subsequent dissolution of the silica templates by NaOH resulted in e.g., monodispersed zirconia, hematite, and cobalt nanoparticles with narrow size distributions.

Functionalization of the SBA-15 surfaces was carried out in the synthesis of cobalt nanoparticles. This functionalization plays a crucial role on the infiltration and reaction of the reagents in the pores of the silica. By functionalization of the external surface, a highly hydrophobic surface was achieved, which proved to be sufficient to avoid formation of large cobalt particles outside the silica channels, while the internal functionalization enhances the attraction of cobalt ions to the silica pores, and as a result the nanoparticles grew inside these pores.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2011. 76 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1372
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-67920 (URN)978-91-7393-156-4 (ISBN)
Public defence
2011-05-31, Planck, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
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Available from: 2011-05-02 Created: 2011-05-02 Last updated: 2013-10-02Bibliographically approved

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Ballem, Mohamed A.Cordoba, José M.Odén, Magnus

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