Microstructure in D2O/n-hexaethylene glycol monododecyl ether (C12E6)/CO2 mixtures determined by small-angle neutron scattering

R. G. Zielinski, E. W. Kaler, M. E. Paulaitis

Research output: Contribution to journalArticle

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Abstract

Phase behavior and small-angle neutron scattering (SANS) experiments were performed on mixtures of D2O/ CO2/n-hexaethylene glycol monododecyl ether (C12E6) as a function of temperature (25-31°C), pressure (63.1-90.7 bar), and CO2 composition (0-3.9 wt %). The addition of carbon dioxide shifts the liquid-liquid miscibility gap present in C12E6/D2O mixtures to lower temperatures. Parameters extracted from model fits of the SANS spectra indicate that, while micellar structure remains essentially unchanged, critical concentration fluctuations increase as the phase boundary and plait point are approached. The variations of micelle structure, scattering contrast, and particle volume fraction with pressure, temperature, and carbon dioxide concentration are consistent with only a minimal amount of carbon dioxide entering the micelles under all conditions.

Original languageEnglish (US)
Pages (from-to)10354-10358
Number of pages5
JournalJournal of physical chemistry
Volume99
Issue number25
DOIs
StatePublished - Jan 1 1995

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