Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2010-10-28
EPL, 92 (2010) 48001
Physics
Condensed Matter
Soft Condensed Matter
Accepted for publication in Europhys. Lett
Scientific paper
10.1209/0295-5075/92/48001
Many wormlike micellar systems exhibit appreciable shear thinning due to shear induced alignment. As the micelles get aligned introducing directionality in the system, the viscoelastic properties are no longer expected to be isotropic. An optical tweezers based active microrheology technique enables us to probe the out-of-equilibrium rheological properties of a wormlike micellar system simultaneously along two orthogonal directions - parallel to the applied shear, as well as perpendicular to it. While the displacements of a trapped bead - in response to active drag force carry signature of conventional shear thinning, its spontaneous position fluctuations along the perpendicular direction manifest an orthogonal shear thickening, an effect hitherto unobserved.
Khan Manas
Sood Ajay K.
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