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7 papers · 2 filters
A spatio-temporal study of rheo-oscillations in a sheared lamellar phase using ultrasound
Sebastien Manneville, Jean-Baptiste Salmon, Annie Colin
We present an experimental study of the flow dynamics of a lamellar phase sheared in the Couette geometry. High-frequency ultrasonic pulses at 36 MHz are used to measure time-resol…
High-frequency ultrasonic speckle velocimetry in sheared complex fluids
S. Manneville, L. Becu, A. Colin
High-frequency ultrasonic pulses at 36 MHz are used to measure velocity profiles in a complex fluid sheared in the Couette geometry. Our technique is based on time-domain cross-cor…
Textural Analysis of a Mesophase with Banana Shaped Molecules
Yu. A. Nastishin, M. F. Achard, H. T. Nguyen +1
Observed under the polarizing microscope, the B7bis phase in the banana compound D14F3 [J.P. Bedel et al, Liq. Cryst., 27, 1411 (2000)] displays two types of textures of defects, n…
The liquid-crystalline smectic blue phases
Eric Grelet
Smectic blue phases (BPSm) are new mesophases of thermotropic liquid crystals, which exhibit a double geometrical frustration: the extension of chirality in three spatial dimension…
Shear-banding in a lyotropic lamellar phase, Part 2: Temporal fluctuations
J-. B. Salmon, S. Manneville, A. Colin
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…
Shear-banding in a lyotropic lamellar phase, Part 1: Time-averaged velocity profiles
J-. B. Salmon, S. Manneville, A. Colin
Using velocity profile measurements based on dynamic light scattering and coupled to structural and rheological measurements in a Couette cell, we present evidences for a shear-ban…