This title appears in the Scientific Report :
2009
Please use the identifier:
http://hdl.handle.net/2128/4662 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevLett.103.248302 in citations.
Competition between shear banding and wall slip in wormlike micelles
Competition between shear banding and wall slip in wormlike micelles
The interplay between shear band (SB) formation and boundary conditions (BC) is investigated in wormlike micellar systems (CPyCl-NaSal) using ultrasonic velocimetry coupled to standard rheology in Couette geometry. Time-resolved velocity profiles are recorded during transient strain-controlled exper...
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Personal Name(s): | Lettinga, M. P. |
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Manneville, S. | |
Contributing Institute: |
Weiche Materie; IFF-7 |
Published in: | Physical review letters, 103 (2009) S. 248302 |
Imprint: |
College Park, Md.
APS
2009
|
Physical Description: |
248302 |
DOI: |
10.1103/PhysRevLett.103.248302 |
Document Type: |
Journal Article |
Research Program: |
Kondensierte Materie |
Series Title: |
Physical Review Letters
103 |
Subject (ZB): | |
Link: |
Get full text OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1103/PhysRevLett.103.248302 in citations.
The interplay between shear band (SB) formation and boundary conditions (BC) is investigated in wormlike micellar systems (CPyCl-NaSal) using ultrasonic velocimetry coupled to standard rheology in Couette geometry. Time-resolved velocity profiles are recorded during transient strain-controlled experiments in smooth and sandblasted geometries. For stick BC standard SB is observed, although depending on the degree of micellar entanglement temporal fluctuations are reported in the highly sheared band. For slip BC wall slip occurs only for shear rates larger than the start of the stress plateau. At low entanglement, SB formation is shifted by a constant Delta gamma center dot, while for more entangled systems SB constantly "nucleate and melt." Micellar orientation gradients at the walls may account for these original features. |