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Nistor CL, Ianchis R, Ghiurea M, et al. Aqueous Dispersions of Silica Stabilized with Oleic Acid Obtained by Green Chemistry. Nanomaterials (Basel). 2016;6(1)doi: 10.3390/nano6010009.
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. (2016). Aqueous Dispersions of Silica Stabilized with Oleic Acid Obtained by Green Chemistry. Nanomaterials (Basel, Switzerland), 6(1), . https://doi.org/10.3390/nano6010009
Nistor, Cristina Lavinia, et al. "Aqueous Dispersions of Silica Stabilized with Oleic Acid Obtained by Green Chemistry." Nanomaterials (Basel, Switzerland) vol. 6,1 (2016). doi: https://doi.org/10.3390/nano6010009
Nistor CL, Ianchis R, Ghiurea M, Nicolae CA, Spataru CI, Culita DC, Pandele Cusu J, Fruth V, Oancea F, Donescu D. Aqueous Dispersions of Silica Stabilized with Oleic Acid Obtained by Green Chemistry. Nanomaterials (Basel). 2016 Jan 05;6(1). doi: 10.3390/nano6010009. PMID: 28344265; PMCID: PMC5302543.
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Nanomaterials (Basel). 2016 Jan 05;6(1). doi: 10.3390/nano6010009.

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

Nanomaterials (Basel, Switzerland)

Cristina Lavinia Nistor, Raluca Ianchis, Marius Ghiurea, Cristian-Andi Nicolae, Catalin-Ilie Spataru, Daniela Cristina Culita, Jeanina Pandele Cusu, Victor Fruth, Florin Oancea, Dan Donescu

Affiliations

  1. R & D National Institute for Chemistry and Petrochemistry, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania. [email protected].
  2. R & D National Institute for Chemistry and Petrochemistry, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania. [email protected].
  3. R & D National Institute for Chemistry and Petrochemistry, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania. [email protected].
  4. R & D National Institute for Chemistry and Petrochemistry, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania. [email protected].
  5. R & D National Institute for Chemistry and Petrochemistry, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania. [email protected].
  6. "Ilie Murgulescu" Institute of Physical Chemistry of Romania Academy, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania. [email protected].
  7. "Ilie Murgulescu" Institute of Physical Chemistry of Romania Academy, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania. [email protected].
  8. "Ilie Murgulescu" Institute of Physical Chemistry of Romania Academy, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania. [email protected].
  9. R & D National Institute for Chemistry and Petrochemistry, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania. [email protected].
  10. R & D National Institute for Chemistry and Petrochemistry, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania. [email protected].

PMID: 28344265 PMCID: PMC5302543 DOI: 10.3390/nano6010009

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.

Keywords: hydrophobic; nanosilica; octadecyltrimethoxysilane; oleic acid; sodium silicate

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