Adsorption of Equimolar Mixtures of Cationic and Anionic Surfactants at the Water/Hexane Interface
In mixed solutions of anionic and cationic surfactants, called catanionics, ion pairs are formed which behave like non-ionic surfactants with a much higher surface activity than the single components. In equimolar mixtures of NaC<sub>n</sub>SO<sub>4</sub> and C<sub>m<...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-12-01
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| Series: | Colloids and Interfaces |
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| Online Access: | https://www.mdpi.com/2504-5377/5/1/1 |
| _version_ | 1811183418747125760 |
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| author | Nenad Mucic Jelena Skrbic Sandra Bucko Lidija Petrovic Jaroslav Katona Valentin B. Fainerman Eugene V. Aksenenko Emanuel Schneck Reinhard Miller |
| author_facet | Nenad Mucic Jelena Skrbic Sandra Bucko Lidija Petrovic Jaroslav Katona Valentin B. Fainerman Eugene V. Aksenenko Emanuel Schneck Reinhard Miller |
| author_sort | Nenad Mucic |
| collection | DOAJ |
| description | In mixed solutions of anionic and cationic surfactants, called catanionics, ion pairs are formed which behave like non-ionic surfactants with a much higher surface activity than the single components. In equimolar mixtures of NaC<sub>n</sub>SO<sub>4</sub> and C<sub>m</sub>TAB, all surface-active ions are paired. For mixtures with <i>n</i> + m = const, the interfacial properties are rather similar. Catanionics containing one long-chain surfactant and one surfactant with medium chain length exhibit a strong increase in surface activity as compared with the single compounds. In contrast, catanionics of one medium- and one short chain surfactant have a surface activity similar to that of the medium-chain surfactant alone. Both the Frumkin model and the reorientation model describe the experimental equilibrium data equally well, while the adsorption kinetics of the mixed medium- and short-chain surfactants can be well described only with the reorientation model. |
| first_indexed | 2024-04-11T09:45:49Z |
| format | Article |
| id | doaj.art-d879c16d07ea432cb7a769aa89937a91 |
| institution | Directory Open Access Journal |
| issn | 2504-5377 |
| language | English |
| last_indexed | 2024-04-11T09:45:49Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Colloids and Interfaces |
| spelling | doaj.art-d879c16d07ea432cb7a769aa89937a912022-12-22T04:31:03ZengMDPI AGColloids and Interfaces2504-53772020-12-0151110.3390/colloids5010001Adsorption of Equimolar Mixtures of Cationic and Anionic Surfactants at the Water/Hexane InterfaceNenad Mucic0Jelena Skrbic1Sandra Bucko2Lidija Petrovic3Jaroslav Katona4Valentin B. Fainerman5Eugene V. Aksenenko6Emanuel Schneck7Reinhard Miller8Faculty of Technology, University of Novi Sad, 21000 Novi Sad, SerbiaFaculty of Technology, University of Novi Sad, 21000 Novi Sad, SerbiaFaculty of Technology, University of Novi Sad, 21000 Novi Sad, SerbiaFaculty of Technology, University of Novi Sad, 21000 Novi Sad, SerbiaFaculty of Technology, University of Novi Sad, 21000 Novi Sad, SerbiaSINTERFACE Technologies, D12489 Berlin, GermanyInstitute of Colloid Chemistry and Chemistry of Water, National Academy of Sciences of Ukraine, 03680 Kyiv, UkrainePhysics Department, Technical University Darmstadt, D64289 Darmstadt, GermanyPhysics Department, Technical University Darmstadt, D64289 Darmstadt, GermanyIn mixed solutions of anionic and cationic surfactants, called catanionics, ion pairs are formed which behave like non-ionic surfactants with a much higher surface activity than the single components. In equimolar mixtures of NaC<sub>n</sub>SO<sub>4</sub> and C<sub>m</sub>TAB, all surface-active ions are paired. For mixtures with <i>n</i> + m = const, the interfacial properties are rather similar. Catanionics containing one long-chain surfactant and one surfactant with medium chain length exhibit a strong increase in surface activity as compared with the single compounds. In contrast, catanionics of one medium- and one short chain surfactant have a surface activity similar to that of the medium-chain surfactant alone. Both the Frumkin model and the reorientation model describe the experimental equilibrium data equally well, while the adsorption kinetics of the mixed medium- and short-chain surfactants can be well described only with the reorientation model.https://www.mdpi.com/2504-5377/5/1/1surfactant adsorptioncatanionic surfactantswater/hexane interfaceinterfacial tensiondrop profile analysis tensiometryeffect of alkyl chain length |
| spellingShingle | Nenad Mucic Jelena Skrbic Sandra Bucko Lidija Petrovic Jaroslav Katona Valentin B. Fainerman Eugene V. Aksenenko Emanuel Schneck Reinhard Miller Adsorption of Equimolar Mixtures of Cationic and Anionic Surfactants at the Water/Hexane Interface Colloids and Interfaces surfactant adsorption catanionic surfactants water/hexane interface interfacial tension drop profile analysis tensiometry effect of alkyl chain length |
| title | Adsorption of Equimolar Mixtures of Cationic and Anionic Surfactants at the Water/Hexane Interface |
| title_full | Adsorption of Equimolar Mixtures of Cationic and Anionic Surfactants at the Water/Hexane Interface |
| title_fullStr | Adsorption of Equimolar Mixtures of Cationic and Anionic Surfactants at the Water/Hexane Interface |
| title_full_unstemmed | Adsorption of Equimolar Mixtures of Cationic and Anionic Surfactants at the Water/Hexane Interface |
| title_short | Adsorption of Equimolar Mixtures of Cationic and Anionic Surfactants at the Water/Hexane Interface |
| title_sort | adsorption of equimolar mixtures of cationic and anionic surfactants at the water hexane interface |
| topic | surfactant adsorption catanionic surfactants water/hexane interface interfacial tension drop profile analysis tensiometry effect of alkyl chain length |
| url | https://www.mdpi.com/2504-5377/5/1/1 |
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