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Dynamics of Wormlike Micelles in Elongational Flows



Philip A. Stone, Paul Dalhaimer, Dennis E. Discher, Eric J. Amis, Steven D. Hudson, Kalman D. Migler


Micelles formed of amphiphilic diblock copolymers may have applications in drug delivery and in understanding the physics of biological structures. Wormlike micelles, in particular, provide an opportunity to study the behavior of semiflexible rods in elongational flows. We utilize microfluidic devices coupled with fluorescence microscopy to study the dynamics of wormlike micelles formed from amphiphilic diblock copolymers. Individual micelles are imaged in a planar elongational flow generated by a simple cross-flow device with dimensions of the order of 100 microns. A sharp transition is seen between the regime where Brownian motion dominates the micellar dynamics and where the micelles stretch with the flow. For a solvent viscosity, hs = 4 cP, this transition occurs in the range of elongation rates, 0.5


Brownian dynamics, elongational flow, fluorescence microscopy, microfluidics, wormlike micelles


Stone, P. , Dalhaimer, P. , Discher, D. , Amis, E. , Hudson, S. and Migler, K. (2006), Dynamics of Wormlike Micelles in Elongational Flows, Macromolecules, [online], (Accessed July 13, 2024)


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Created January 1, 2006, Updated February 17, 2017