3rd meeting of young researchers at UP 1 - IJUP - Universidade do ...

Synthesis of Silica Nanoparticles with Hydro/Oleophobic and
Thermal Insulation Properties
A. Monteiro 1 , R. Neto 1 , C. Pereira 1 , B. Jarrais 2 , A. Carneiro 2 , M. F. R. Pereira 3 and C.
Freire 1
1 REQUIMTE, Dep. Química e Bioquímica, Fac. Ciências, Univ. Porto, 4169-007 Porto.
2 Centro de Nanotecnologia e Materiais Técnicos, Funcionais e Inteligentes (CeNTI), 4760-034 Vila
Nova de Famalicão.
3 Laboratório de Catálise e Materiais (LCM), Laboratório Associado LSRE/LCM, Dep. Engenharia
Química, Fac. Engenharia, Univ. Porto, 4200-465 Porto.
In the era of Nanotechnology, the design of functional and technical textiles with improved
properties is attracting growing interest, since the consumers increasingly demand products
with better performances [1]. The incorporation of silica nanoparticles (SNPs) on fabrics is a
promising route for the production of novel high performance textiles with
superhydro/oleophobic and/or thermal insulating properties (Fig. 1) [1].
Fig. 1 – Schematic representation of textiles functionalization with SNPs.
This work reports the synthesis of different types of SNPs with hydro/oleophobic and/or
thermal insulating properties, by two different methods.
The first methodology consisted on the simultaneous synthesis and functionalization of SNPs,
in the presence of a template, by co-condensation of tetraethylorthosilicate and a variety of
organosilanes containing hydro/oleophobic groups.
In the second approach, SNPs were synthesized using a different silica precursor without
adding any template [2]. Monodispersed SNPs were prepared by sol-gel, following a two-step
procedure: acid hydrolysis of the silica precursor followed by condensation in basic medium.
The functionalized SNPs were characterized by FTIR-ATR, SEM-EDS, TG and DLS. The
hydrophobicity and oleophobicity properties were evaluated through contact angles
measurements. These nanoparticles will be further incorporated onto textiles.
Acknowledgments: The authors wish to thank Evonik-Goldschmidt GmbH for providing some
silanes. This work was partially funded by Projecto de Investigação Científica na Pré-Graduação 2009,
U.P. and Santander Totta, and by FCT and FEDER (Portugal), through project
PTDC/CTM/108820/2008. CP thanks FCT for a grant.
References:
+
Silica nanoparticles Textile substrate Functional textile
[1] Mahltig, B., Haufe, H., Böttcher, H. (2005), Functionalisation of textiles by inorganic sol–gel
coatings, Journal of Materials Chemistry, 15, 4385–4398.
[2] Hah, H. J., Kim, J. S., Jeon, B. J., Koo, S. M., Lee, Y. E. (2003), Simple preparation of
monodisperse hollow silica particles without using templates, Chem. Commun., 1712–1713.
350 3 rd meeting of young researchers at UP