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Nanomaterials 2016, 6(1), 9; doi:10.3390/nano6010009

Aqueous Dispersions of Silica Stabilized with Oleic Acid Obtained by Green Chemistry

1
R & D National Institute for Chemistry and Petrochemistry, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania
2
“Ilie Murgulescu” Institute of Physical Chemistry of Romania Academy, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania
*
Author to whom correspondence should be addressed.
Academic Editors: Jordi Sort, Yoshihiro Ito, Baoshan Xing and Thomas Nann
Received: 10 November 2015 / Revised: 18 December 2015 / Accepted: 30 December 2015 / Published: 5 January 2016
View Full-Text   |   Download PDF [3490 KB, uploaded 5 January 2016]   |  

Abstract

The present study describes for the first time the synthesis of silica nanoparticles starting from sodium silicate and oleic acid (OLA). The interactions between OLA and sodium silicate require an optimal OLA/OLANa molar ratio able to generate vesicles that can stabilize silica particles obtained by the sol-gel process of sodium silicate. The optimal molar ratio of OLA/OLANa can be ensured by a proper selection of OLA and respectively of sodium silicate concentration. The titration of sodium silicate with OLA revealed a stabilization phenomenon of silica/OLA vesicles and the dependence between their average size and reagent’s molar ratio. Dynamic light scattering (DLS) and scanning electron microscopy (SEM) measurements emphasized the successful synthesis of silica nanoparticles starting from renewable materials, in mild condition of green chemistry. By grafting octadecyltrimethoxysilane on the initial silica particles, an increased interaction between silica particles and the OLA/OLANa complex was achieved. This interaction between the oleyl and octadecyl chains resulted in the formation of stable gel-like aqueous systems. Subsequently, olive oil and an oleophylic red dye were solubilized in these stable aqueous systems. This great dispersing capacity of oleosoluble compounds opens new perspectives for future green chemistry applications. After the removal of water and of the organic chains by thermal treatment, mesoporous silica was obtained. View Full-Text
Keywords: nanosilica; hydrophobic; octadecyltrimethoxysilane; oleic acid; sodium silicate nanosilica; hydrophobic; octadecyltrimethoxysilane; oleic acid; sodium silicate
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Nistor, C.L.; Ianchis, R.; Ghiurea, M.; Nicolae, C.-A.; Spataru, C.-I.; Culita, D.C.; Pandele Cusu, J.; Fruth, V.; Oancea, F.; Donescu, D. Aqueous Dispersions of Silica Stabilized with Oleic Acid Obtained by Green Chemistry. Nanomaterials 2016, 6, 9.

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