Orientation selection in lamellar phases by oscillatory shears

Zhi Feng Huang, Jorge Viñals

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


In order to address the selection mechanism that is responsible for the unique lamellar orientation observed in block copolymers under oscillatory shears, we use a constitutive law for the dissipative part of the stress tensor that respects the uniaxial symmetry of a lamellar phase. An interface separating two domains oriented parallel and perpendicular to the shear is shown to be hydrodynamically unstable, a situation analogous to the thin layer instability of stratified fluids under shears. The resulting secondary flows break the degeneracy between the parallel and perpendicular lamellar orientation, leading to a preferred perpendicular orientation in certain ranges of parameters of the polymer and of the shear.

Original languageEnglish (US)
Article number060501
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Issue number6
StatePublished - 2006


Dive into the research topics of 'Orientation selection in lamellar phases by oscillatory shears'. Together they form a unique fingerprint.

Cite this