Folmer Britta M, Nydén Magnus
Nestlé Research Centre, Vers-chez-les-Blanc, 1000 Lausanne 26, Switzerland.
Langmuir. 2008 Jun 1;24(13):6441-6. doi: 10.1021/la703758p. Epub 2008 May 29.
The self-assembly of a sterol ethoxylate surfactant with 30 oxyethylene units in water was studied by 1H NMR self-diffusion measurements in a wide concentration range in the micellar region (0-25 wt %). The data showed that the surfactant aggregates do not interact by hard sphere interactions but rather a strong concentration dependence of the diffusion coefficient was noted which was explained by polymer scaling theory. In the cubic phase (30-65 wt %), the self-diffusion data from water, from surfactant, and from free polyoxyethylene suggest spherical micelles, although water diffusion was much restricted due to binding to the surfactant headgroup. From X-ray measurements in the cubic phase, the unit cell size was calculated, and together with surfactant self-diffusion measurements the exchange dynamics between free and aggregated surfactant was obtained.
通过在胶束区域（0-25 wt%）的宽浓度范围内进行的1H NMR自扩散测量，研究了具有30个氧乙烯单元的甾醇乙氧基化物表面活性剂在水中的自组装。数据表明，表面活性剂聚集体并非通过硬球相互作用相互作用，而是注意到扩散系数有很强的浓度依赖性，这可以用聚合物标度理论来解释。在立方相（30-65 wt%）中，来自水、表面活性剂和游离聚氧乙烯的自扩散数据表明存在球形胶束，尽管由于与表面活性剂头基的结合，水的扩散受到很大限制。通过立方相的X射线测量，计算了晶胞尺寸，并结合表面活性剂自扩散测量，获得了游离和聚集表面活性剂之间的交换动力学。
