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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