Phase behavior and characterization of micellar and cubic phases in the nonionic surfactant C⟨-17⟩E⟨84⟩/water system.: A PFG NMR, SAXS, Cryo-TEM, and fluorescence study

被引:27
作者
Hakansson, B
Hansson, P
Regev, O
Soderman, O
机构
[1] Univ Lund, Ctr Chem & Chem Engn, Div Phys Chem 1, S-22100 Lund, Sweden
[2] Ben Gurion Univ Negev, Dept Chem Engn, IL-84105 Beer Sheva, Israel
关键词
D O I
10.1021/la9800811
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
An extensive study of the diffusion behavior of the C[17]E[84]/water system is presented. The surfactant, when mixed with water, forms a micellar phase below approximate to 13 wt% and a cubic phase between approximate to 20-60 wt % (at 25 degrees C). In addition to the pulsed Geld gradient (PFG) NMR technique (used to determine the self-diffusion coefficients), the system has been investigated by small-angle X-ray scattering (SAXS), cryo-transmission electronmicroscopy (cryo-TEM), and time-resolved fluorescence quenching(TRFQ). The self-diffusion coefficient (D) and the transverse relaxation time (T-2) of the surfactant molecules decrease significantly when going from the micellar to the cubic phase. The results of the PFG NMR, SAXS, cryo-TEM, and TRFQ experiments show that the cubic phase is composed of discrete aggregates. On the basis of the rapid transverse H-1 NMR relaxation in the cubic phase, it is argued that the micellar building blocks of the cubic phase are nonspherical. Furthermore, the SAXS data for four different concentrations of the surfactant (25, 35, 45, and 55 wt %) in the cubic phase can be indexed to the space group Im3m. If the data from the NMR and the SAXS measurements are combined, a lifetime of the surfactant monomers in the micelles of 8 and 7 ms was obtained at 25 and 35 wt % C[17]E[84], respectively.
引用
收藏
页码:5730 / 5739
页数:10
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