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- W2567966056 abstract "Molecular aggregation in a mixture of Triton X-100/n-hexanol/cyclohexane at a molar ratio of 1/16/74 is studied upon addition of small amounts of water. The composition of organic components has been chosen at a ratio n-hexanol/cyclohexane where a well-formed hydrogen bond network has been described. The ratio Triton X-100/n-hexanol has been chosen to afford a stoichiometry of ethylene oxide (EO) residues/n-hexanol of 1/2. At these conditions the addition of water consecutively produces the appearance of three defined phases: a clear solution, a lamellar phase, and a microemulsion. The two corresponding transitions occur at water/EO/n-hexanol molar ratios of 2/1/2 (clear to lamella), and 3/1/2 (lamella to microemulsion), while phase separation occurs at a molar ratio of 4/1/2, highlighting the important role of stoichiometry. Molecular dynamics measured by 1H NMR techniques, such as DOSY, and calculations of T1 and T2 relaxation times allow distinguishing the transition between the different phases and justifying their structure. Molecular assembly in the three phases is organized around hydrogen bond networks in which the hydroxyl groups of both TX-100 and n-hexanol, ethylene oxide groups of TX-100, and water participate. 1D 1H NMR spectral changes correlate with the different characteristics of the different phases. As the main characteristics of the lamellar phase we find a very restricted mobility of the molecules involved, and water chemical shifts in 1D 1H NMR spectra of around 5.0 ppm, higher than that of bulk water appearing at 4.7 ppm." @default.
- W2567966056 created "2017-01-13" @default.
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- W2567966056 date "2017-01-20" @default.
- W2567966056 modified "2023-10-18" @default.
- W2567966056 title "Water-Induced Phase Transition in Cyclohexane/<i>n</i>-Hexanol/Triton X-100 Mixtures at a Molar Composition of 1/16/74 Studied by NMR" @default.
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- W2567966056 doi "https://doi.org/10.1021/acs.jpcb.6b11752" @default.
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