Ludwig, Michael ; Geisler, Ramsia ; Prévost, Sylvain ; Klitzing, Regine von (2023)
Shape and Structure Formation of Mixed Nonionic−Anionic Surfactant Micelles.
In: Molecules, 2021, 26 (14)
doi: 10.26083/tuprints-00019619
Artikel, Zweitveröffentlichung, Verlagsversion
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Kurzbeschreibung (Abstract)
Aqueous solutions of a nonionic surfactant (either Tween20 or BrijL23) and an anionic surfactant (sodium dodecyl sulfate, SDS) are investigated, using small-angle neutron scattering (SANS). SANS spectra are analysed by using a core-shell model to describe the form factor of self-assembled surfactant micelles; the intermicellar interactions are modelled by using a hard-sphere Percus–Yevick (HS-PY) or a rescaled mean spherical approximation (RMSA) structure factor. Choosing these specific nonionic surfactants allows for comparison of the effect of branched (Tween20) and linear (BrijL23) surfactant headgroups, both constituted of poly-ethylene oxide (PEO) groups. The nonionic–anionic surfactant mixtures are studied at various concentrations up to highly concentrated samples (Φ ≲ 0.45) and various mixing ratios, from pure nonionic to pure anionic surfactant solutions. The scattering data reveal the formation of mixed micelles already at concentrations below the critical micelle concentration of SDS. At higher volume fractions, excluded volume effects dominate the intermicellar structuring, even for charged micelles. In consequence, at high volume fractions, the intermicellar structuring is the same for charged and uncharged micelles. At all mixing ratios, almost spherical mixed micelles form. This offers the opportunity to create a system of colloidal particles with a variable surface charge. This excludes only roughly equimolar mixing ratios (X≈ 0.4–0.6) at which the micelles significantly increase in size and ellipticity due to specific sulfate–EO interactions.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2023 |
| Autor(en): | Ludwig, Michael ; Geisler, Ramsia ; Prévost, Sylvain ; Klitzing, Regine von |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Shape and Structure Formation of Mixed Nonionic−Anionic Surfactant Micelles |
| Sprache: | Englisch |
| Publikationsjahr: | 14 November 2023 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | 2021 |
| Ort der Erstveröffentlichung: | Basel |
| Verlag: | MDPI |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Molecules |
| Jahrgang/Volume einer Zeitschrift: | 26 |
| (Heft-)Nummer: | 14 |
| Kollation: | 23 Seiten |
| DOI: | 10.26083/tuprints-00019619 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/19619 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichung DeepGreen |
| Kurzbeschreibung (Abstract): | Aqueous solutions of a nonionic surfactant (either Tween20 or BrijL23) and an anionic surfactant (sodium dodecyl sulfate, SDS) are investigated, using small-angle neutron scattering (SANS). SANS spectra are analysed by using a core-shell model to describe the form factor of self-assembled surfactant micelles; the intermicellar interactions are modelled by using a hard-sphere Percus–Yevick (HS-PY) or a rescaled mean spherical approximation (RMSA) structure factor. Choosing these specific nonionic surfactants allows for comparison of the effect of branched (Tween20) and linear (BrijL23) surfactant headgroups, both constituted of poly-ethylene oxide (PEO) groups. The nonionic–anionic surfactant mixtures are studied at various concentrations up to highly concentrated samples (Φ ≲ 0.45) and various mixing ratios, from pure nonionic to pure anionic surfactant solutions. The scattering data reveal the formation of mixed micelles already at concentrations below the critical micelle concentration of SDS. At higher volume fractions, excluded volume effects dominate the intermicellar structuring, even for charged micelles. In consequence, at high volume fractions, the intermicellar structuring is the same for charged and uncharged micelles. At all mixing ratios, almost spherical mixed micelles form. This offers the opportunity to create a system of colloidal particles with a variable surface charge. This excludes only roughly equimolar mixing ratios (X≈ 0.4–0.6) at which the micelles significantly increase in size and ellipticity due to specific sulfate–EO interactions. |
| Freie Schlagworte: | small-angle neutron scattering, surfactant, micelles, mixed micelles, Tween20, polysorbate 20, BrijL23, Brij 35, SDS |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-196191 |
| Zusätzliche Informationen: | This article belongs to the Special Issue Functional Colloids for Advanced Nanomaterials and Composites: From Theory to Applications |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 530 Physik |
| Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik 05 Fachbereich Physik > Institut für Physik Kondensierter Materie (IPKM) 05 Fachbereich Physik > Institut für Physik Kondensierter Materie (IPKM) > Soft Matter at Interfaces (SMI) |
| Hinterlegungsdatum: | 14 Nov 2023 14:02 |
| Letzte Änderung: | 15 Nov 2023 08:27 |
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| Suche nach Titel in: | TUfind oder in Google |
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- Shape and Structure Formation of Mixed Nonionic−Anionic Surfactant Micelles. (deposited 14 Nov 2023 14:02) [Gegenwärtig angezeigt]
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