1. Determining threadlike micelle lengths from rheometry
- Author
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Weizhong Zou, Michael Rene Weaver, Grace Tan, and Ronald G. Larson
- Subjects
Physics ,Persistence length ,Mesoscopic physics ,Rheometry ,Mechanical Engineering ,Thermodynamics ,Modulus ,Condensed Matter Physics ,Plateau (mathematics) ,Micelle ,Mean field theory ,Mechanics of Materials ,General Materials Science ,Scaling - Abstract
We show that the average length ⟨ L ⟩ of threadlike micelles in surfactant solutions predicted by fitting results of a mesoscopic simulation, the “pointer algorithm,” to experimental G′(ω), G″(ω) data, is longer than, and more accurate than, that from a scaling law that equates ⟨ L ⟩ / l e to the modulus ratio G 0 / G m i n ′ ′. Here, G0 is the plateau modulus, G m i n ′ ′ is obtained at the local minimum in G″, and l e is the entanglement length. The accuracy of the pointer algorithm is supported by the agreement of its predictions with results from a recent application of the slip-spring simulation method to threadlike micelles. Improved fits of the pointer algorithm to the slip-spring results are obtained for weakly entangled micelles (with an average number of entanglements of Z
- Published
- 2021