NMR spectroscopy was used to study the behaviors of three binary surfactant micellar solutions, NP-10/DTAC, NP-10/C12-C4-C12 and NP-10/C12-C8-C12 respectively. Relative arrangement and the sites of interactions between the surfactant molecule pairs in the mixed micelles, as well as the differences in inter-/intra- molecular interactions were investigated. 2D NOESY experiments revealed that the number of sites of interaction varied across the different binary mixtures, and the degree of interactions increased in the following order:NP-10/C12-C8-C12 > NP-10/C12-C4-C12 > NP-10/DTAC. Self-diffusion coefficient experiments showed that the influence of NP-10 on the hydro-dynamic radius of the mixed micelles was greater than that of quaternary ammonium salts. Spin-spin relaxation time experiments indicated that, for NP-10/DTAC and NP-10/C12-Cs-C12 (s=4 or 8) binary systems, intra-molecular interactions dominated and inter-molecular interactions began to decrease at molar ratios 1:3 and 1:2. These points corresponded to the optimal molar ratio for synergic effects. Spatial distance measurements supported this result, confirmed that the optimal molar ratio was 1:3 and 1:2.
ZHAO Rui-ge
,
ZHANG Zhan-hui
,
YANG Qiu-qing
,
MA Er-qian
,
LI Yong-xiao
. Interactions Between NP-10 and Single/Double Chain Quaternary Ammonium Salts Studied by NMR Spectroscopy[J]. Chinese Journal of Magnetic Resonance, 2017
, 34(1)
: 16
-24
.
DOI: 10.11938/cjmr20170103
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