A small angle x-ray scattering study of the droplet–cylinder transition in oil-rich sodium bis(2-ethylhexyl) sulfosuccinate microemulsions
A small angle x-ray scattering study of the droplet–cylinder transition in oil-rich sodium bis(2-ethylhexyl) sulfosuccinate microemulsions
复制标题
富油双(2-乙基己基)磺基琥珀酸钠微乳液中液滴-圆柱体转变的小角X射线散射研究
DOI：
--
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
E. M. Blokhuis
中科院分区：
文献类型：
--
作者：
D. Svergun;P. Konarev;V. Volkov;M. Koch;W. Sager;J. Smeets;E. M. Blokhuis
提出了一种多分散混合物x射线散射数据的非线性拟合方法。将其应用于分析富油的油包水型（w/o）琥珀酸双（2-乙基己基）酯磺酸钠（AOT）微乳液的液滴相结构随温度升高或盐的加入而发生的变化。对于不同的液滴尺寸（水/AOT摩尔比wo=25至56）和浓度（液滴重量分数cw=2%至20%），在L2相（w/o微乳液）的单相区域内的不同温度（15至60℃）和盐浓度（最高0.6%NaCl）下收集数据。这使我们能够区分来自单个散射粒子的贡献，例如，液滴和圆柱体的总散射强度。包含500多条散射曲线的完整数据集可以通过将AOT覆盖的水滴、长圆柱体和仅含结合水的反AOT胶束的散射加权和拟合到实验散射曲线来解释。
A method for nonlinear fitting of x-ray scattering data from polydisperse mixtures was developed. It was applied to the analysis of the structural changes in the droplet phase of oil-rich water-in-oil (w/o) sodium bis(2-ethylhexyl) sulfosuccinate (AOT) microemulsions with increasing temperature or upon addition of salt. Data were collected at different temperatures (15 to 60 °C) and salt concentrations (up to 0.6% NaCl) within the one-phase region of the L2 phase (w/o microemulsion) for different droplet sizes (water/AOT molar ratio wo=25 to 56) and concentrations (droplet weight fraction cw=2% to 20%). This allowed us to distinguish between contributions from individual scattering particles, e.g., droplets and cylinders to the total scattering intensity. The complete data set containing over 500 scattering curves could be interpreted by fitting the scattering of weighted sums of AOT covered water droplets, long cylinders, and inverse AOT micelles containing bound water only, to the experimental scatterin...