Aqueous Dispersions of Silica Stabilized with Oleic Acid Obtained by Green Chemistry
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...
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| Format: | Article |
| Language: | English |
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MDPI AG
2016-01-01
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| Series: | Nanomaterials |
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| Online Access: | http://www.mdpi.com/2079-4991/6/1/9 |
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| author | 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 |
| author_facet | 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 |
| author_sort | Cristina Lavinia Nistor |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-11T07:52:15Z |
| format | Article |
| id | doaj.art-f761a098c46a422c82906757ccc53287 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-12-11T07:52:15Z |
| publishDate | 2016-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-f761a098c46a422c82906757ccc532872022-12-22T01:15:19ZengMDPI AGNanomaterials2079-49912016-01-0161910.3390/nano6010009nano6010009Aqueous Dispersions of Silica Stabilized with Oleic Acid Obtained by Green ChemistryCristina Lavinia Nistor0Raluca Ianchis1Marius Ghiurea2Cristian-Andi Nicolae3Catalin-Ilie Spataru4Daniela Cristina Culita5Jeanina Pandele Cusu6Victor Fruth7Florin Oancea8Dan Donescu9R & D National Institute for Chemistry and Petrochemistry, Spl. Independentei 202, 6th District, 060021 Bucharest, RomaniaR & D National Institute for Chemistry and Petrochemistry, Spl. Independentei 202, 6th District, 060021 Bucharest, RomaniaR & D National Institute for Chemistry and Petrochemistry, Spl. Independentei 202, 6th District, 060021 Bucharest, RomaniaR & D National Institute for Chemistry and Petrochemistry, Spl. Independentei 202, 6th District, 060021 Bucharest, RomaniaR & D National Institute for Chemistry and Petrochemistry, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania“Ilie Murgulescu” Institute of Physical Chemistry of Romania Academy, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania“Ilie Murgulescu” Institute of Physical Chemistry of Romania Academy, Spl. Independentei 202, 6th District, 060021 Bucharest, Romania“Ilie Murgulescu” Institute of Physical Chemistry of Romania Academy, Spl. Independentei 202, 6th District, 060021 Bucharest, RomaniaR & D National Institute for Chemistry and Petrochemistry, Spl. Independentei 202, 6th District, 060021 Bucharest, RomaniaR & D National Institute for Chemistry and Petrochemistry, Spl. Independentei 202, 6th District, 060021 Bucharest, RomaniaThe 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.http://www.mdpi.com/2079-4991/6/1/9nanosilicahydrophobicoctadecyltrimethoxysilaneoleic acidsodium silicate |
| spellingShingle | 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 Aqueous Dispersions of Silica Stabilized with Oleic Acid Obtained by Green Chemistry Nanomaterials nanosilica hydrophobic octadecyltrimethoxysilane oleic acid sodium silicate |
| title | Aqueous Dispersions of Silica Stabilized with Oleic Acid Obtained by Green Chemistry |
| title_full | Aqueous Dispersions of Silica Stabilized with Oleic Acid Obtained by Green Chemistry |
| title_fullStr | Aqueous Dispersions of Silica Stabilized with Oleic Acid Obtained by Green Chemistry |
| title_full_unstemmed | Aqueous Dispersions of Silica Stabilized with Oleic Acid Obtained by Green Chemistry |
| title_short | Aqueous Dispersions of Silica Stabilized with Oleic Acid Obtained by Green Chemistry |
| title_sort | aqueous dispersions of silica stabilized with oleic acid obtained by green chemistry |
| topic | nanosilica hydrophobic octadecyltrimethoxysilane oleic acid sodium silicate |
| url | http://www.mdpi.com/2079-4991/6/1/9 |
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