Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 6, Pages 1335-1338Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.1335
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The flow-structure relation of lamellar phases is studied using rheometry and cross-polarized microscopy under flow. The equilibrium phases show different defects. Low salinities lead to very viscous, ''onion phases, whereas at high salinity, a low viscosity plane lamellar phase is found. Under shear, the latter shows a sudden transition to a viscoelastic gel, with a texture and viscosity very similar to that of the onions. Gelation occurs after a certain delay time, increasing: rapidly with salinity, by the nucleation of onions. This allows one to relate the delay time to the defect energy.
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