Blochowicz, Thomas ; Gögelein, C. ; Spehr, T. ; Müller, M. ; Stühn, B. (2007)
Polymer-induced transient networks in water-in-oil microemulsions studied by small-angle X-ray and dynamic light scattering.
In: Physical Review E, 76 (4)
doi: 10.1103/PhysRevE.76.041505
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We study water-in-oil microemulsions, in particular dispersions of water droplets coated with a monolayer of the anionic surfactant AOT in a continuous phase of n-decane. Upon addition of the amphiphilic triblock copolymer PEO(polyethylenoxide)-PI(polyisoprene)-PEO, a transient network is formed. At constant droplet size we vary the polymer concentration and there is clear evidence for an increasing crosslinking of the droplets from structural investigations with small-angle x-ray scattering. The dynamics of concentration fluctuations consisting of the translational diffusion of the droplets and the relaxation of the network are monitored with photon correlation spectroscopy. We mainly focus on the variation of the dynamic behavior as a function of the number of polymer molecules per droplet and the droplet volume fraction, which may be taken as a measure for the interdroplet distance. With increasing polymer content the dynamics of the system slows down and three different relaxation processes may be distinguished. We discuss the origin of the different relaxation modes. In particular, it turns out that the intermediate relaxation mode may be suppressed by index matching the oil matrix and the PI block and that it is effectively slowed down by an additional loading of the emulsion droplets with polyethylene glycol of increasing molecular weight.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2007 |
| Autor(en): | Blochowicz, Thomas ; Gögelein, C. ; Spehr, T. ; Müller, M. ; Stühn, B. |
| Art des Eintrags: | Bibliographie |
| Titel: | Polymer-induced transient networks in water-in-oil microemulsions studied by small-angle X-ray and dynamic light scattering |
| Sprache: | Englisch |
| Publikationsjahr: | Oktober 2007 |
| Verlag: | American Physical Society |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review E |
| Jahrgang/Volume einer Zeitschrift: | 76 |
| (Heft-)Nummer: | 4 |
| DOI: | 10.1103/PhysRevE.76.041505 |
| Zugehörige Links: | |
| Kurzbeschreibung (Abstract): | We study water-in-oil microemulsions, in particular dispersions of water droplets coated with a monolayer of the anionic surfactant AOT in a continuous phase of n-decane. Upon addition of the amphiphilic triblock copolymer PEO(polyethylenoxide)-PI(polyisoprene)-PEO, a transient network is formed. At constant droplet size we vary the polymer concentration and there is clear evidence for an increasing crosslinking of the droplets from structural investigations with small-angle x-ray scattering. The dynamics of concentration fluctuations consisting of the translational diffusion of the droplets and the relaxation of the network are monitored with photon correlation spectroscopy. We mainly focus on the variation of the dynamic behavior as a function of the number of polymer molecules per droplet and the droplet volume fraction, which may be taken as a measure for the interdroplet distance. With increasing polymer content the dynamics of the system slows down and three different relaxation processes may be distinguished. We discuss the origin of the different relaxation modes. In particular, it turns out that the intermediate relaxation mode may be suppressed by index matching the oil matrix and the PI block and that it is effectively slowed down by an additional loading of the emulsion droplets with polyethylene glycol of increasing molecular weight. |
| Zusätzliche Informationen: | Art.No.: 041505 |
| Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik 05 Fachbereich Physik > Institut für Festkörperphysik (2021 umbenannt in Institut für Physik Kondensierter Materie (IPKM)) 05 Fachbereich Physik > Institut für Festkörperphysik (2021 umbenannt in Institut für Physik Kondensierter Materie (IPKM)) > Struktur und Dynamik amorpher Systeme |
| Hinterlegungsdatum: | 15 Dez 2020 13:02 |
| Letzte Änderung: | 08 Jul 2021 07:16 |
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