Shear-banding in a lyotropic lamellar phase, Part 2: Temporal fluctuations

Details Shear-banding in a lyotropic lamellar phase, Part 2: Temporal fluctuations Shear-banding in a lyotropic lamellar phase, Part 2: Temporal fluctuations

2003-07-24

arxiv.org/abs/cond-mat/0307609v1

Phys. Rev. E 68, 051504 (2003)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevE.68.051504

We analyze the temporal fluctuations of the flow field associated to a shear-induced transition in a lyotropic lamellar phase: the layering transition of the onion texture. In the first part of this work [Salmon et al., submitted to Phys. Rev. E], we have evidenced banded flows at the onset of this shear-induced transition which are well accounted for by the classical picture of shear-banding. In the present paper, we focus on the temporal fluctuations of the flow field recorded in the coexistence domain. These striking dynamics are very slow (100--1000s) and cannot be due to external mechanical noise. Using velocimetry coupled to structural measurements, we show that these fluctuations are due to a motion of the interface separating the two differently sheared bands. Such a motion seems to be governed by the fluctuations of $\sigma^\star$, the local stress at the interface between the two bands. Our results thus provide more evidence for the relevance of the classical mechanical approach of shear-banding even if the mechanism leading to the fluctuations of $\sigma^\star$ remains unclear.

Affiliated with

Also associated with

No associations

Rating

Shear-banding in a lyotropic lamellar phase, Part 2: Temporal fluctuations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Shear-banding in a lyotropic lamellar phase, Part 2: Temporal fluctuations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Shear-banding in a lyotropic lamellar phase, Part 2: Temporal fluctuations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-367559