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Polymer loaded microemulsions: Changeover from finite size effects to interfacial interactions

Kuttich, B. and Ivanova, O. and Grillo, I. and Stühn, B. (2016):
Polymer loaded microemulsions: Changeover from finite size effects to interfacial interactions.
In: JOURNAL OF CHEMICAL PHYSICS, AMER INST PHYSICS, 145, (16), ISSN 0021-9606, [Article]

Abstract

Form fluctuations of microemulsion droplets are observed in experiments using dielectric spectroscopy (DS) and neutron spin echo spectroscopy (NSE). Previous work on dioctyl sodium sulfosuccinate based water in oil microemulsions in the droplet phase has shown that adding a water soluble polymer (Polyethylene glycol M = 1500 g mol(-1)) modifies these fluctuations. While for small droplet sizes (water core radius r(c) < 37 angstrom) compared to the size of the polymer both methods consistently showed a reduction in the bending modulus of the surfactant shell as a result of polymer addition, dielectric spectroscopy suggests the opposite behaviour for large droplets. This observation is now confirmed by NSE experiments on large droplets. Structural changes due to polymer addition are qualitatively independent of droplet size. Dynamical properties, however, display a clear variation with the number of polymer chains per droplet, leading to the observed changes in the bending modulus. Furthermore, the contribution of structural and dynamical properties on the changes in bending modulus shifts in weight. With increasing droplet size, we initially find dominating finite size effects and a changeover to a system, where interactions between the confined polymer and the surfactant shell dominate the bending modulus. Published by AIP Publishing.

Item Type: Article
Erschienen: 2016
Creators: Kuttich, B. and Ivanova, O. and Grillo, I. and Stühn, B.
Title: Polymer loaded microemulsions: Changeover from finite size effects to interfacial interactions
Language: Afar
Abstract:

Form fluctuations of microemulsion droplets are observed in experiments using dielectric spectroscopy (DS) and neutron spin echo spectroscopy (NSE). Previous work on dioctyl sodium sulfosuccinate based water in oil microemulsions in the droplet phase has shown that adding a water soluble polymer (Polyethylene glycol M = 1500 g mol(-1)) modifies these fluctuations. While for small droplet sizes (water core radius r(c) < 37 angstrom) compared to the size of the polymer both methods consistently showed a reduction in the bending modulus of the surfactant shell as a result of polymer addition, dielectric spectroscopy suggests the opposite behaviour for large droplets. This observation is now confirmed by NSE experiments on large droplets. Structural changes due to polymer addition are qualitatively independent of droplet size. Dynamical properties, however, display a clear variation with the number of polymer chains per droplet, leading to the observed changes in the bending modulus. Furthermore, the contribution of structural and dynamical properties on the changes in bending modulus shifts in weight. With increasing droplet size, we initially find dominating finite size effects and a changeover to a system, where interactions between the confined polymer and the surfactant shell dominate the bending modulus. Published by AIP Publishing.

Journal or Publication Title: JOURNAL OF CHEMICAL PHYSICS
Volume: 145
Number: 16
Place of Publication: 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
Publisher: AMER INST PHYSICS
Divisions: 05 Department of Physics > Institute for condensed matter physics > Experimental Condensed Matter Physics
05 Department of Physics > Institute for condensed matter physics
05 Department of Physics
Event Location: 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
Date Deposited: 30 Jan 2017 12:10
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