Orientation selection in lamellar phases by oscillatory shears

Zhi Feng Huang, Jorge Viñals

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

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
Volume73
Issue number6
DOIs
StatePublished - Jun 12 2006

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Perpendicular
shear
Block Copolymers
Stratified Fluid
Secondary Flow
secondary flow
Constitutive Law
Stress Tensor
stress tensors
Thin Layer
block copolymers
Degeneracy
Polymers
Unstable
Symmetry
fluids
polymers
symmetry
Range of data

Cite this

Orientation selection in lamellar phases by oscillatory shears. / Huang, Zhi Feng; Viñals, Jorge.

In: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, Vol. 73, No. 6, 060501, 12.06.2006.

Research output: Contribution to journalArticle

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