The effect of branching on shear banding in wormlike micelles (WLMs) under large amplitude oscillatory shear (Laos)

Michelle A. Calabrese, Simon A. Rogers, Lionel Porcar, Norman J. Wagner

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Self-assembled wormlike micelles (WLMs) are of particular scientific and technological interest due to their ability to branch, break, and reform under shear, which can lead to nonlinear flow phenomena and instabilities such as shear banding [1,2]. As measuring chain branching in polymer physics is a long-standing scientific challenge, branched WLMs are also used as a model system for studying branched polymers. Nonlinear rheology and large amplitude oscillatory shear (Laos) have shown to be useful in the study of chain branching [3], but quantitative relationships are still lacking. Thus, understanding the coupling between flow behavior and molecular topology requires experimental methods that combine time- and spatially-resolved small angle neutron scattering (SANS) measurements of structure with rheometry for nonlinear deformations [4]. Here, we explore the relationship between branching, microstructure and nonlinear responses using a series of well-characterized, branched WLM solutions [1, 5-7]. While micellar branching is physically distinct from chemical branching in polymers [8], we observe similar responses under shear startup and Laos [3, 9].

Original languageEnglish (US)
Title of host publicationEngineering Sciences and Fundamentals 2016 - Core Programming Area at the 2016 AIChE Annual Meeting
PublisherAIChE
Pages104-106
Number of pages3
Volume1
ISBN (Electronic)9781510834347
StatePublished - 2016
EventEngineering Sciences and Fundamentals 2016 - Core Programming Area at the 2016 AIChE Annual Meeting - San Francisco, United States
Duration: Nov 13 2016Nov 18 2016

Other

OtherEngineering Sciences and Fundamentals 2016 - Core Programming Area at the 2016 AIChE Annual Meeting
CountryUnited States
CitySan Francisco
Period11/13/1611/18/16

ASJC Scopus subject areas

  • Materials Science(all)
  • Chemical Engineering(all)
  • Engineering(all)

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    Calabrese, M. A., Rogers, S. A., Porcar, L., & Wagner, N. J. (2016). The effect of branching on shear banding in wormlike micelles (WLMs) under large amplitude oscillatory shear (Laos). In Engineering Sciences and Fundamentals 2016 - Core Programming Area at the 2016 AIChE Annual Meeting (Vol. 1, pp. 104-106). AIChE.