TY  - JOUR
AU  - Rogers, S.
AU  - Kohlbrecher, J.
AU  - Lettinga, M.P.
TI  - The molecular origin of stress generation in worm-like micelles, using a rheo-SANS LAOS approach
JO  - Soft matter
VL  - 8
SN  - 1744-683X
CY  - Cambridge
PB  - Royal Society of Chemistry (RSC)
M1  - PreJuSER-21988
SP  - 3831 - 3839
PY  - 2012
N1  - Financial support by the German Research Foundation within SFB TR 6, and the European Network Nanodirect (grant no. NMP4-SL-2008-213948). The authors thank P. Ballesta for fruitful discussions.
AB  - We combine large-amplitude oscillatory shear (LAOS) and time-resolved small angle neutron scattering (t-SANS) measurements on the dynamic response of a dispersion of surfactant worm-like micelles. By viewing the response as being the result of a sequence of physical processes, we observe new features of the system response. We identify three distinct frequency regimes including a high frequency Maxwell-like, a yielding, and a settled flow regime. For each regime we identify the molecular origins, on a Kuhn segment scale, of the stress response. We show the ability of the material to 'over-orient' pre-yielding, compared with stationary flow. Finally, we present a stress-orientation rule which is rate-based at low frequencies and strain-based at high frequencies.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000306276300011
DO  - DOI:10.1039/c2sm25569c
UR  - https://juser.fz-juelich.de/record/21988
ER  -