非离子烷基糖苷与阴离子表面活性剂的水性混合物中形成的胶束的小角中子散射和静态光散射研究

A small-angle neutron and static light scattering study of micelles formed in aqueous mixtures of a nonionic alkylglucoside and an anionic surfactant.

作者信息

Bergström L Magnus, Bastardo Luis A, Garamus Vasil M

机构信息

Department of Pharmacy, Pharmaceutical Physical Chemistry, Box 580, Uppsala University, SE-751 23 Uppsala, Sweden.

出版信息

J Phys Chem B. 2005 Jun 30;109(25):12387-93. doi: 10.1021/jp051113d.

DOI:10.1021/jp051113d

PMID:16852532

Abstract

The size and shape of micelles formed in aqueous mixtures of the anionic surfactant sodium dodecyl sulfate (SDS) and the nonionic sugar-based surfactant n-decyl beta-D-glucopyranoside (C(10)G) at different concentrations of added salt have been investigated with small-angle neutron and static light scattering. Rather small prolate ellipsoidal micelles form in the absence of added salt and at [NaCl] = 10 mM in D(2)O. The micelles grow considerably in length to large rods as the electrolyte concentration is raised to [NaCl] = 0.1 M. In excess of nonionic surfactant ([SDS]/[C(10)G] = 1:3) at [NaCl] = 0.1 M in D(2)O, several thousands of Angstroms long wormlike micelles are observed. Most interestingly, a conspicuously large isotope solvent effect was observed from static light scattering data according to which micelles formed at [SDS]/[C(10)G] = 1:3 and [NaCl] = 0.1 M in H(2)O are at least five times smaller than micelles formed in the corresponding samples in D(2)O.

摘要

通过小角中子散射和静态光散射研究了在不同添加盐浓度下，阴离子表面活性剂十二烷基硫酸钠（SDS）与非离子糖基表面活性剂正癸基-β-D-吡喃葡萄糖苷（C(10)G）的水性混合物中形成的胶束的大小和形状。在未添加盐以及重水（D₂O）中氯化钠浓度为10 mM时，形成相当小的长椭球形胶束。随着电解质浓度提高到氯化钠浓度为0.1 M，胶束长度大幅增长成为大棒状。在重水（D₂O）中氯化钠浓度为0.1 M且非离子表面活性剂过量（[SDS]/[C(10)G] = 1:3）时，观察到数千埃长的蠕虫状胶束。最有趣的是，根据静态光散射数据观察到显著的大同位素溶剂效应，即在水中[SDS]/[C(10)G] = 1:3且氯化钠浓度为0.1 M时形成的胶束比在相应重水（D₂O）样品中形成的胶束至少小五倍。