ANM
2010
3rd
International Conference on Advanced Nano Materials
12-15 September 2010 - Agadir, Morocco
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Abstract
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ANMM175 |
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FROM WHITE TO BLACK HYBRID SILICA NANOCOMPOSITES |
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Clara Pereira,1 Andreia
Monteiro,1 Hugo Gaspar,1 Lisete S. G. Fernandes,2 Eloy del Río,3
André M. Pereira,4 Pedro B. Tavares,2 Ginesa Blanco,3 Jose M.
Pintado,3 João P. Araújo,4 Ana P. Carvalho,5 João
Pires,5 Manuel F. R. Pereira6 and Cristina Freire1 |
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1 REQUIMTE, Dep. de Química e Bioquímica, Fac. de Ciências, Univ. do Porto, 4169-007 Porto, Portugal
2 Dep. de Química and CQ-VR, Univ. de Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal
3 Dep. de Ciencia de Materiales e Ingeniería Metalúrgica
y Química Inorgánica, Univ. de Cadiz, Aptdo. 40, 11510
Puerto Real, Spain
4 IFIMUP and IN – Instituto de Nanociência e
Nanotecnologia, Dep. de Física e Astronomia, Fac. de
Ciências, Univ. do Porto, 4169-007 Porto, Portugal
5 Dep. de Química e Bioquímica and CQB, Fac. de Ciências, Univ. de Lisboa, 1749-016 Lisboa, Portugal
6 Lab. de Catálise e Materiais (LCM), Lab. Associado LSRE/LCM,
Dep. de Engenharia Química, Fac. de Engenharia, Univ. do Porto,
4200-465 Porto, Portugal |
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Since
the birth of Nanotechnology, new challenges emerged in various areas of
research towards the design of novel hybrid functional nanomaterials
and technological processes. Due to their unique features and
versatility, silica-based nanomaterials, specifically silica
nanoparticles and silica-carbon nanocomposites, are of special interest
for a myriad of applications namely in biology, medicine, catalysis,
environmental remediation, electrochemical devices and energy.
This work reports the synthesis of positively charged hybrid silica
nanoparticles by a one-pot co-condensation methodology of a silica
precursor and a quarternary ammonium silane, under alkaline conditions
and in the presence and absence of a cationic surfactant. These
nanomaterials were characterized by several techniques. The SEM and TEM
techniques revealed that the hybrid silica nanoparticles synthesized
without surfactant presented nearly spherical shape with sizes ranging
from 100-170 nm, whereas those prepared in the presence of surfactant
showed higher size in the range of 140-270 nm and a rougher surface.
The presence of the charged organosilane was confirmed by FTIR, EDS,
XPS, TGA and 13C and 29Si solid state NMR.
The black analog of the silica nanoparticles arose from the thermal
treatment of the white functional silica nanoparticles, resulting in a
silica-carbon nanocomposite, which was also characterized by several
techniques. A change in the morphology and surface chemical composition
was induced, resulting in a graphitic layer incorporated throughout the
silica nanoparticles framework.
Acknowledgments: This work was funded by FCT and FEDER, through project
ref. PTDC/CTM/108820/2008, and by Portuguese-Spanish Bilateral
Cooperation through project REF E-72/10. CP and AMP thank FCT for their
fellowships.
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