TY  - JOUR
AU  - Lang, Christian
AU  - Porcar, Lionel
AU  - Kriegs, Hartmut
AU  - Lettinga, P.
TI  - A quest for shear banding in ideal and non ideal colloidal rods
JO  - Journal of physics / D Applied physics D
VL  - 52
IS  - 7
SN  - 1361-6463
CY  - Bristol
PB  - IOP Publ.
M1  - FZJ-2018-06984
SP  - -
PY  - 2019
AB  - We assess the possibility of shear banding of semidilute rod-like colloidal suspensions under steady shear flow very close to the isotropic-nematic spinodal, using a combination of rheology, small angle neutron scattering, and laser Doppler velocimetry. Model systems are employed which allow for a length and stiffness variation of the particles. The rheological signature reveals that these systems are strongly shear thinning at moderate shear rates. It is shown that the longest and most flexible rods undergo the strongest shear thinning and have the greatest potential to form shear bands. Although we find a small but significant gradient of the orientational order parameter throughout the gap of the shear cell, no shear banding transition is tractable in the region of intermediate shear rates. At very low shear rates, gradient banding and wall slip occur simultaneously, but the shear bands are not stable over time.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000453285500002
DO  - DOI:10.1088/1361-6463/aaf40c
UR  - https://juser.fz-juelich.de/record/858040
ER  -