Abstract
Quadrupole splittings in 2H NMR spectra from 2H2O have been determined in the binary systems 2H2O-C12H25(O-CH2CH2)xOH for x = 4 and 6. The average order parameter for the water molecules, as determined from the quadrupole splittings, is at a given number of water molecules per ethylene oxide group considerably higher for the surfactant with a short ethylene oxide chain. In the hexagonal phase, the order parameter decreases with increasing temperature. The temperature dependence is more complex in the lamellar phase. At low water contents the order parameter decreases with increasing temperature while at higher water contents the order parameter passes through a maximum. The results are discussed in terms of the temperature dependent repulsion between hydrated ethylene oxide groups and in relation to the stability regions for the different liquid crystalline phases.
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Klason, T., Henriksson, U. (1984). The Interaction Between Water and Ethylene Oxide Groups in Oligo (Ethylene Glycol) Dodecyl Ethers as Studied by 2H NMR in Liquid Crystalline Phases. In: Mittal, K.L., Lindman, B. (eds) Surfactants in Solution. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2280-9_7
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DOI: https://doi.org/10.1007/978-1-4899-2280-9_7
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