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A simple approach to the synthesis of hollow microspheres with magnetite/silica hybrid walls

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Abstract.
In this paper, we report a simple approach for templating synthesis of magnetic hollow composite
microspheres with magnetite/silica walls. This approach is based on the co-sedimentation of polymer
microspheres and magnetic colloids followed by impregnation with silica oligomer from tetraethyl
orthosilicate and the further removal of the polymer microspheres by pyrolysis. The diameter of the
hollow microspheres can be adjusted in range of 300 nm–2.0 μm by using polymer microspheres of
different sizes and the wall thickness is tunable from 10–50 nm by controlling ratio of magnetite
to the polymer microspheres. Magnetic characterizations show that the hollow microspheres have
superparamagnetism with magnetization saturation of 10–30 emu/g. HRTEM and N2 adsorption–
desorption isotherms reveal that the hollow microspheres have numerous nanopores in the walls with a
broad distribution in the range of 2 to 80 nm, which results in a high BET surface (67.6 m2/g) and pores
volume (0.14 cm3/g).

Keywords:
Synthesis
Templating
Hollow microspheres
Mesoporous materials
Magnetic
Sol–gel

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Informasi Detail

Judul Seri

Journal of Colloid and Interface Science

No. Panggil

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Penerbit

London : Elsevier Inc.., 2009

Deskripsi Fisik

Journal of Colloid and Interface Science 333 (2009) 329–334

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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