Analysis of relaxation mechanism of thread-like micelle solution

Satoru Yamamoto, Taku Ozawa, Kosuke Ohata

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Dissipative particle dynamics is applied to study the crossing dynamics at an entanglement point of surfactant thread-like micelles in an aqueous solution. This chapter investigates the possibility of a phantom crossing, which is the relaxation mechanism for the pronounced viscoelastic behavior of a surfactant thread-like micellar solution. When two thread-like micelles are encountered at an entanglement point under a condition close to thermal equilibrium, they fuse to form a four-armed branch point. Then, a phantom crossing reaction occurs occasionally, or one micelle is cut down at the branch point. When increasing the repulsive forces between hydrophilic parts of the surfactants, fusion occurs less and the thread-like micelle is frequently broken down at an entanglement point. In these three schemes (i.e., a phantom crossing, a cut at the branch point, and a break at the entanglement point), the breakage occurs somewhere along the thread-like micelle. The breakage is considered as an essential process in the relaxation mechanism, and a phantom crossing can be seen as a special case of these processes. To explain the experimental evidence that a terminal of thread-like micelles is scarcely observed, a mechanism is also proposed where the generated terminal merges into the connected micelle part between two entanglement points owing to thermal motion.

Original languageEnglish
Title of host publicationComputer Simulation of Polymeric Materials
Subtitle of host publicationApplications of the OCTA System
PublisherSpringer Singapore
Pages347-358
Number of pages12
ISBN (Electronic)9789811008153
ISBN (Print)9789811008146
DOIs
Publication statusPublished - Jan 1 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Engineering(all)
  • Materials Science(all)

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  • Cite this

    Yamamoto, S., Ozawa, T., & Ohata, K. (2016). Analysis of relaxation mechanism of thread-like micelle solution. In Computer Simulation of Polymeric Materials: Applications of the OCTA System (pp. 347-358). Springer Singapore. https://doi.org/10.1007/978-981-10-0815-3_25