Almost fooled again: New insights into cesium dodecyl sulfate micelle structures

Han Seung Lee, Manickam Adhimoolam Arunagirinathan, Apostolos Vagias, Sangwoo Lee, Jayesh R. Bellare, H. Ted Davis, Eric W Kaler, Alon McCormick (he /him), Frank S Bates

Research output: Contribution to journalArticlepeer-review

Abstract

Replacing sodium with cesium as the counterion for dodecyl sulfate in aqueous solution results in stronger complexation and charge shielding, which should lead to larger micelles and ultimately to a cylindrical structure (cf. spheres for sodium dodecyl sulfate), but small angle X-ray scattering (SAXS) and small angle neutron scattering patterns previously have been interpreted with ellipsoidal micelle models. We directly image CsDS micelles via cryo-transmission electron microscopy and report large core-shell spherical micelles at low concentrations (2 wt %) and cylindrical micelles at higher concentrations (5.0 and 8.1 wt %). These structures are shown to be consistent with SAXS patterns modeled using established form factors. These findings highlight the importance of combining real and reciprocal space imaging techniques in the characterization of self-assembled soft materials.

Original languageEnglish (US)
Pages (from-to)12743-12747
Number of pages5
JournalLangmuir
Volume30
Issue number43
DOIs
StatePublished - Nov 4 2014

Bibliographical note

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© 2014 American Chemical Society.

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