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Static and Dynamic Perturbations of Droplet Microemulsion by Confinement and Adsorption of Polymer

Published online by Cambridge University Press:  15 February 2011

Jyotsana Lal ,
Bela Farago  and
Loic Auvray
Jyotsana Lal
Affiliation:
Laboratoire Leon Brillouin, CEN -Saclay, 91191 Gif-Sur-Yvette, Cedex, France.
Bela Farago
Affiliation:
Institute Laue Langevin, Grenoble, France.
Loic Auvray
Affiliation:
Laboratoire Leon Brillouin, CEN -Saclay, 91191 Gif-Sur-Yvette, Cedex, France.
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Abstract

The effects induced on the structure and dynamics of dilute microemulsion droplets by the confinement of polymer chains inside the droplets and by the adsorption of polymer on the surfactant shells from the outer continous phase were studied. The local structure changes were observed by small angle neutron scattering (SANS). The curvature fluctuations and the size distribution of the droplets increase for both chains inside and outside by different possible mechanisms, an induced size polydispersity minimizing osmotic stresses in the first case, a lowering of the film rigidity in the second one. Neutron spin echo techniques (NSE) were also used to probe the shape fluctuations of the same droplets with and without polymer. A sharp characteristic peak due to the contribution of the 1=2 mode is exhibited by the spectrum of relaxation times as a function of wavevector q. The height of this peak is decreased with the addition of polymer. i.e. the fluctuation of the 1=2 modes are dampened with the addition of polymer. The effect on the elastic coefficient K of the surfactant layer will be discussed below.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 366: Symposium N – Dynamics in Small Confining Systems , 1994 , 427
Copyright
Copyright © Materials Research Society 1995

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