Journal Article

PreJuSER-21988

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The molecular origin of stress generation in worm-like micelles, using a rheo-SANS LAOS approach

Rogers, S.FZJ* ; Kohlbrecher, J. ; Lettinga, M. P.FZJ*

2012
Royal Society of Chemistry (RSC) Cambridge

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Please use a persistent id in citations: http://hdl.handle.net/2128/4633  doi:10.1039/c2sm25569c

Abstract: 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.

Keyword(s): J

Note: 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.

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Contributing Institute(s):

1. Weiche Materie (ICS-3)

Research Program(s):

1. BioSoft: Makromolekulare Systeme und biologische Informationsverarbeitung (P45)
2. NANODIRECT - Toolbox for Directed and Controlled Self-Assembly of nano-Colloids (213948) (213948)

Appears in the scientific report 2012

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Database coverage:
; ; ; Allianz-Lizenz / DFG ; Current Contents - Social and Behavioral Sciences ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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