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- W2477686913 abstract "Quadrupole splittings in the NMR spectra of counterions may be used to obtain information on the ionic interactions in surfactant mesophases and model membrane systems. On the basis of a survey of the general theory, the information provided and types of applications are outlined. Quadrupole splittings have been obtained for 7Li+, 23Na+, 39K+, 87Rb+, 35Cl-, 37Cl- and 81Br-using either continuous-wave or pulse NMR methods. In the case of strong quadrupole interactions, second-order effects may dominate the appearance of the spectrum. Multiple quantum transitions may often be observed under typical experimental conditions and constitute a possible source of misinterpretation. Experimental counterion quadrupole splittings were obtained as a function of sample composition and phase structure for different surfactant systems and their implications on counterion binding are discussed. 23Na quadrupole splittings vary considerably both in their magnitude and in their temperature and concentration dependences with the amphiphile polar head group demonstrating a marked specificity in the counterion binding. On the basis of previous work deductions are made about the values of the order parameters characterizing the partial orientation of the field gradients of bound counterions. Tentative conclusions about the geometrical structure of the surfaces of amphiphilic aggreates are presented." @default.
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- W2477686913 date "1976-06-01" @default.
- W2477686913 modified "2023-10-18" @default.
- W2477686913 title "The NMR Quadrupole Splitting Method for Studying Ion Binding in Liquid Crystals" @default.
- W2477686913 doi "https://doi.org/10.1021/bk-1976-0034.ch031" @default.
- W2477686913 hasPublicationYear "1976" @default.
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