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6th Workshop Operator Theory in Krein Spaces and Operator Polynomials 20.11.2006
Workshop - Visualisierung in den Geowissenschaften 13.11.2006
The 2nd "MATHEredaktiON" 13.10.2006
9. Colloquium 13.10.2006
8. Colloquium
Canceled because of illness.
Montag, den 20. November 2006, 17.00 Uhr s.t.
(Ab 16:30 Uhr Kaffee, Tee und Kekse im Raum MA 315)

Technische Universität Berlin, Institut für Mathematik, MA 004 Straße des 17. Juni 136, 10623 Berlin

Prof. L. Pamela Cook
(Dept. Mathematical Sciences, University of Delaware, Newark/USA)

Thema: Wormlike micellar solutions: Modeling and predictions

Abstract: Surfactants are amphiphilic molecules that can self-assemble in solution. Under certain conditions, they self-assemble into long highly flexible worm-like micelles. These wormlike structures can entangle and thus exhibit viscoelastic properties like polymers; however, in contrast to polymers, they can also break and reform continuously thus presenting an additional relaxation mechanism. Experimental observations show that these solutions exhibit distinctive (inhomogeneous) behaviors under different deformation conditions; for example, in steady shear flow these surfactant solutions develop ‘shear bands’ (or more accurately “shear rate bands”). Concurrent with this banding is the development of a shear stress plateau in the flow curve over a broad range of shear rates.

In this talk a reaction-diffusion constitutive model is presented that incorporates a discrete version of the breaking and reforming dynamics proposed by Cates, and models each wormy micelle as an element of an interconnected elastic network. The rheological predictions of this constitutive model are investigated both analytically and computationally under homogeneous and nonhomogeneous flow conditions; in steady and transient shear, in uniaxial extension and in step strain. These predictions are compared to those of other models and to results from experiments with a cetyl pyridinium chloride/sodium salicylate (CpyCl/NaSal) micellar solution.
13.10.2006
"MathInside - Mathematik ist überall" Urania Lectures 13.10.2006
Matheon media-award 2006 10.08.2006
Invitation 11.06.2006
Computing by the Numbers: Algorithms, Precision, and Complexity, July 20 - July 21 06.06.2006
Science Café at the URANIA (in German) 05.05.2006
Science-Café at Urania 10.04.2006
Gerd Fischer at the Matheon Lounge 03.03.2006
Workshop on Nonlinear Eigenvalue Problems 15.02.2006
"MathInside - Mathematik ist überall" Urania Lectures 01.02.2006
Festival of Mathematics 22.01.2006
Matheon Lounge: Why aren't you a millionaire, yet? 15.01.2006
Science Café at the URANIA (in German) 05.01.2006
 
 
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