Müller, M. ; Stühn, B. ; Busse, K. ; Kressler, J. (2009)
Modification of a reverse microemulsion with a fluorinated triblock copolymer.
In: Journal of Colloid and Interface Science, 335 (2)
doi: 10.1016/j.jcis.2009.03.085
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
A w/o microemulsion consisting of n-decane, ACT, and water with a droplet volume fraction Phi = 0.2 and a molar ratio of water to ACT omega = 40 has been used as a model system to investigate the effect of added amphiphilic triblock copolymers on structure and conductivity of the system. Structure of the system is determined by small-angle X-ray scattering. Conductivity is measured in a wide frequency and temperature range. The pure microemulsion displays the known phenomenon of conductivity increase with temperature at the percolation temperature T-p. Droplets are found to decrease in size in the same temperature range. The triblock copolymer poly(perfluorohexyl ethyl methacrylate)-b-poly(ethylene oxide)-b-poly(perfluorohexylethyl methacrylate) has been added to the microemulsion such that the number of polymers per droplet z is between 0.5 and 2. The polymer dissolves in the microemulsion and is located in the droplet. Microemulsion droplets deform continuously from spherical to prolate ellipsoidal shape with increasing polymer content. Furthermore, a strong shift of T-p to higher T with increasing polymer content is observed. For z > 1.5 Delta T-p is nearly constant. Besides the confinement effect the specific interaction of the polymer blocks with the surfactant layer are of importance. (C) 2009 Elsevier Inc. All rights reserved.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2009 |
| Autor(en): | Müller, M. ; Stühn, B. ; Busse, K. ; Kressler, J. |
| Art des Eintrags: | Bibliographie |
| Titel: | Modification of a reverse microemulsion with a fluorinated triblock copolymer |
| Sprache: | Englisch |
| Publikationsjahr: | Juli 2009 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Colloid and Interface Science |
| Jahrgang/Volume einer Zeitschrift: | 335 |
| (Heft-)Nummer: | 2 |
| DOI: | 10.1016/j.jcis.2009.03.085 |
| Kurzbeschreibung (Abstract): | A w/o microemulsion consisting of n-decane, ACT, and water with a droplet volume fraction Phi = 0.2 and a molar ratio of water to ACT omega = 40 has been used as a model system to investigate the effect of added amphiphilic triblock copolymers on structure and conductivity of the system. Structure of the system is determined by small-angle X-ray scattering. Conductivity is measured in a wide frequency and temperature range. The pure microemulsion displays the known phenomenon of conductivity increase with temperature at the percolation temperature T-p. Droplets are found to decrease in size in the same temperature range. The triblock copolymer poly(perfluorohexyl ethyl methacrylate)-b-poly(ethylene oxide)-b-poly(perfluorohexylethyl methacrylate) has been added to the microemulsion such that the number of polymers per droplet z is between 0.5 and 2. The polymer dissolves in the microemulsion and is located in the droplet. Microemulsion droplets deform continuously from spherical to prolate ellipsoidal shape with increasing polymer content. Furthermore, a strong shift of T-p to higher T with increasing polymer content is observed. For z > 1.5 Delta T-p is nearly constant. Besides the confinement effect the specific interaction of the polymer blocks with the surfactant layer are of importance. (C) 2009 Elsevier Inc. All rights reserved. |
| Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik > Institut für Festkörperphysik (2021 umbenannt in Institut für Physik Kondensierter Materie (IPKM)) 05 Fachbereich Physik |
| Hinterlegungsdatum: | 27 Feb 2010 13:52 |
| Letzte Änderung: | 05 Mär 2013 09:32 |
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