OBSERVATION OF BULK PHASE-SEPARATION AND COEXISTENCE IN A SHEARED MICELLAR SOLUTION

Citation
P. Boltenhagen et al., OBSERVATION OF BULK PHASE-SEPARATION AND COEXISTENCE IN A SHEARED MICELLAR SOLUTION, Physical review letters, 79(12), 1997, pp. 2359-2362
Citations number
14
Categorie Soggetti
Physics
Journal title
ISSN journal
00319007
Volume
79
Issue
12
Year of publication
1997
Pages
2359 - 2362
Database
ISI
SICI code
0031-9007(1997)79:12<2359:OOBPAC>2.0.ZU;2-0
Abstract
We observe a shear-flow-induced phase transition in wormlike micelle s olutions which depends on whether the applied stress or the applied sh ear rate is held constant. When the shear stress is held constant, the system macroscopically phase separates into two coexisting phases wit h a single stable interface between them. By contrast, when the shear rate is held constant, the system still undergoes a phase transition, but the steady states are homogeneous and no coexistence is observed. This leads to dramatically different rheological behavior and unusual long-lived metastable states.