Anomalous change in lamellar spacing by shear flow in nonionic surfactant/water system

T. Kato, K. Minewaki, K. Miyazaki, Y. Kawabata, M. Imai

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

Abstract

Small-angle neutron scattering (SANS) is measured on a lamellar phase in C16E7 (hepta(oxyethylene glycol)-n-hexadecylether) /water system (40 - 55 wt% of C16E7) at 70 °C under shear flow. As the shear rate increases from 0.3 to 1 s-1, the repeat distance (d) is reduced suddenly and discontinuously. With the further increase in the shear rate, d increases slightly after taking a minimum (d∗). These results are obtained for all the principal orientations of lamellae. While d at rest increases from 6.5 nm to 8.5 nm with decreasing concentration from 55 to 40 wt%, d∗ is almost independent of concentration and nearly equal to the thickness of bilayers (∼ 5 nm) obtained from the line shape analysis of small angle X-ray scattering at rest. These results suggest segregation into surfactant-rich and water-rich regions.

Original languageEnglish
Title of host publicationSlow Dynamics in Complex Systems
Subtitle of host publication3rd International Symposium on Slow Dynamics in Complex Systems
EditorsMichio Tokuyama, Irwin Oppenheim
PublisherAmerican Institute of Physics Inc.
Pages94-95
Number of pages2
ISBN (Electronic)0735401837
DOIs
Publication statusPublished - 2004 Apr 30
Externally publishedYes
Event3rd International Symposium on Slow Dynamics in Complex Systems - Sendai, Japan
Duration: 2003 Nov 32003 Nov 8

Publication series

NameAIP Conference Proceedings
Volume708
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other3rd International Symposium on Slow Dynamics in Complex Systems
CountryJapan
CitySendai
Period03/11/303/11/8

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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