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A proton nuclear magnetic resonance relaxation study of C12E6/D2O

TitleA proton nuclear magnetic resonance relaxation study of C12E6/D2O
Publication TypeJournal Article
Year of Publication2000
AuthorsBurnell, EE, Capitani, D, Casieri, C, Segre, AL
JournalJournal of Physical Chemistry B
Volume104
Pagination8782-8791
Date PublishedSep
Type of ArticleArticle
ISBN Number1089-5647
KeywordsCHAIN, CYCLING, LYOTROPIC LIQUID-CRYSTAL, NMR-RELAXOMETRY, PHASES, POTASSIUM PALMITATE, REPTATION, SPIN-LATTICE RELAXATION, SURFACTANTS, SYSTEM, WATER
Abstract

Aqueous solutions of the nonionic surfactant, n-dodecylhexaoxyethylene glycol [C12H25(OCH2CH2)(6)OH], termed C12E6, form various phases at room temperature: there is a micellar phase at high water content, hexagonal, cubic, and lamellar mesophases at intermediate water contents, and an isotropic phase at very low water content. Proton nuclear magnetic resonance (NMR) T-1(-1) relaxation rates have been measured for the C12E6/D2O system as a function of composition, spectral frequency, and temperature. The results are interpreted in terms of the possible molecular motions for the C12E6 molecule in the different phases. A review of relaxation theory is presented with special attention to molecular exchange between sites that are associated with different relaxation rates.

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