The Effects of Ethanol Concentration and of Ionic Strength on the Zeta Potential of Titania in the Presence of Sodium Octadecyl Sulfate
Sodium octadecyl sulfate (C<sub>18</sub>H<sub>37</sub>SO<sub>4</sub>Na) induces a negative zeta potential of metal oxides at very low surfactant concentrations as compared with shorter-chained sodium alkyl sulfates. The problem of low solubility of sodium octadecy...
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| Format: | Article |
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MDPI AG
2020-11-01
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| Series: | Colloids and Interfaces |
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| Online Access: | https://www.mdpi.com/2504-5377/4/4/49 |
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| author | Marek Kosmulski Edward Mączka |
| author_facet | Marek Kosmulski Edward Mączka |
| author_sort | Marek Kosmulski |
| collection | DOAJ |
| description | Sodium octadecyl sulfate (C<sub>18</sub>H<sub>37</sub>SO<sub>4</sub>Na) induces a negative zeta potential of metal oxides at very low surfactant concentrations as compared with shorter-chained sodium alkyl sulfates. The problem of low solubility of sodium octadecyl sulfate in water was solved by the addition of the surfactant to dispersions as ethanolic stock solution, but then the presence of ethanol in dispersions was inevitable. We demonstrate that the concentration of ethanol (up to 5% by mass) in a dispersion containing titania (TiO<sub>2</sub>) and sodium octadecyl sulfate has an insignificant effect on the zeta potential of particles. We further demonstrate that the shifts in the IEP of titania induced by the presence of sodium octadecyl sulfate are independent of the NaCl concentration. The results obtained in this study can be generalized for 1-1 salts other than NaCl, for metal oxides other than titania, for organic co-solvents other than ethanol, and for sparingly soluble ionic surfactants other than sodium octadecyl sulfate. |
| first_indexed | 2024-03-10T15:09:16Z |
| format | Article |
| id | doaj.art-a393e8e1ef7844caa1d6e6640e2822e6 |
| institution | Directory Open Access Journal |
| issn | 2504-5377 |
| language | English |
| last_indexed | 2024-03-10T15:09:16Z |
| publishDate | 2020-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Colloids and Interfaces |
| spelling | doaj.art-a393e8e1ef7844caa1d6e6640e2822e62023-11-20T19:29:54ZengMDPI AGColloids and Interfaces2504-53772020-11-01444910.3390/colloids4040049The Effects of Ethanol Concentration and of Ionic Strength on the Zeta Potential of Titania in the Presence of Sodium Octadecyl SulfateMarek Kosmulski0Edward Mączka1Laboratory of Electrochemistry, Lublin University of Technology, ul. Nadbystrzycka 38, 20618 Lublin, PolandLaboratory of Electrochemistry, Lublin University of Technology, ul. Nadbystrzycka 38, 20618 Lublin, PolandSodium octadecyl sulfate (C<sub>18</sub>H<sub>37</sub>SO<sub>4</sub>Na) induces a negative zeta potential of metal oxides at very low surfactant concentrations as compared with shorter-chained sodium alkyl sulfates. The problem of low solubility of sodium octadecyl sulfate in water was solved by the addition of the surfactant to dispersions as ethanolic stock solution, but then the presence of ethanol in dispersions was inevitable. We demonstrate that the concentration of ethanol (up to 5% by mass) in a dispersion containing titania (TiO<sub>2</sub>) and sodium octadecyl sulfate has an insignificant effect on the zeta potential of particles. We further demonstrate that the shifts in the IEP of titania induced by the presence of sodium octadecyl sulfate are independent of the NaCl concentration. The results obtained in this study can be generalized for 1-1 salts other than NaCl, for metal oxides other than titania, for organic co-solvents other than ethanol, and for sparingly soluble ionic surfactants other than sodium octadecyl sulfate.https://www.mdpi.com/2504-5377/4/4/49isoelectric pointanionic surfactantanatasemixed solventelectrophoretic mobilitypH-dependent surface charging |
| spellingShingle | Marek Kosmulski Edward Mączka The Effects of Ethanol Concentration and of Ionic Strength on the Zeta Potential of Titania in the Presence of Sodium Octadecyl Sulfate Colloids and Interfaces isoelectric point anionic surfactant anatase mixed solvent electrophoretic mobility pH-dependent surface charging |
| title | The Effects of Ethanol Concentration and of Ionic Strength on the Zeta Potential of Titania in the Presence of Sodium Octadecyl Sulfate |
| title_full | The Effects of Ethanol Concentration and of Ionic Strength on the Zeta Potential of Titania in the Presence of Sodium Octadecyl Sulfate |
| title_fullStr | The Effects of Ethanol Concentration and of Ionic Strength on the Zeta Potential of Titania in the Presence of Sodium Octadecyl Sulfate |
| title_full_unstemmed | The Effects of Ethanol Concentration and of Ionic Strength on the Zeta Potential of Titania in the Presence of Sodium Octadecyl Sulfate |
| title_short | The Effects of Ethanol Concentration and of Ionic Strength on the Zeta Potential of Titania in the Presence of Sodium Octadecyl Sulfate |
| title_sort | effects of ethanol concentration and of ionic strength on the zeta potential of titania in the presence of sodium octadecyl sulfate |
| topic | isoelectric point anionic surfactant anatase mixed solvent electrophoretic mobility pH-dependent surface charging |
| url | https://www.mdpi.com/2504-5377/4/4/49 |
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