Undulations in salt-free charged lamellar phases detected by small angle neutron scattering and neutron reflectivity

Golchi Salamat, Renko De Vries, Eric W. Kaler, Sushil Satija, Lipiin Sung

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

Neutron reflectivity of lamellar phases containing pentaethylene glycol n-dodecyl ether, sodium decylsulfonate, and D2O is measured at the solid-liquid interface. The scattering length density profiles deduced from fits to the reflectivity data show that undulations of the mixed surfactant bilayers close to the solid-liquid interface decrease as the molar ratio of ionic to nonionic surfactant increases. This is consistent with recent theoretical predictions. Small angle neutron scattering measurements of these samples show both small angle scattering and quasi-Bragg peaks. As the molar ratio of ionic to nonionic surfactant increases, the low-q scattering intensity decreases and higher order quasi-Bragg peaks appear. These changes in the bulk neutron scattering signal are consistent with the changes observed with reflectivity.

Original languageEnglish (US)
Pages (from-to)102-107
Number of pages6
JournalLangmuir
Volume16
Issue number1
DOIs
StatePublished - Jan 1 2000

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