MAGNETIC MESOPOROUS SILICA NANOCOMPOSITES PREPARED WITH DIFFERENT SIZED Fe3O4: STRUCTURAL AND MAGNETIC PROPERTIES, CATALYTIC EFFECTS

Year 2018, Volume: 19 Issue: 2, 514 - 522, 30.06.2018

Sezer Erdem , Beyhan Erdem , Ramis Mustafa Öksüzoğlu

https://doi.org/10.18038/aubtda.338384

Cited By: 2

Abstract

The magnetically separable mesoporous silica
nanocomposites were successfully prepared through a one-pot method including the
co-condensation of tetraethoxysilane (TEOS) as silica precursor and
3-mercaptopropyl trimethoxysilane (MPTMS) as functionalizing agent accompanied
with hydrogen peroxide for oxidation of mercapto groups and triblock copolymers
as structure directing agent in the presence of ferromagnetic and
superparamagnetic Fe₃O₄ nanoparticles. By incorporating
the superparamagnetic (near zero coercivity) Fe₃O₄
nanoparticles to the mesoporous silica (SBA-15) and functionalizing with
sulfonic acid groups instead of ferromagnetic Fe₃O₄ nanoparticles,
we developed versatile nanocomposite having superior properties with respect to
magnetism, catalysis and porosity. Reducing the particle size of Fe₃O₄
from the ferromagnetic regime to the superparamagnetic regime, the pore closure
could be eliminated because of the more open pore as well as saving magnetic
properties.

Keywords

Magnetic nanocomposites, Mesoporous silica, Esterification, Fe3O4, SBA-15

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