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首页> 外文期刊>Berichte der Bunsengesellschaft fur Physikalische Chemie >Small Angle Scattering Applied to Microemulsions
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Small Angle Scattering Applied to Microemulsions

机译：小角度散射应用于微乳

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摘要

We present a procedure for the evaluation of small-angle scattering data from microemulsions. A model independent picture of the structures in the various one-phase samples emerges from the Indirect Fourier Transformation analysis of the measured small-angle neutron scattering (SANS) spectra. The data analysis makes no a priori assumptions about the type of structure. Rather, the pair distance distribution functions are so unique that an unambiguous assignment of spherical, cylindrical or planar geometry is possible. In addition, the scattering length density profile normal to the interface is obtained by a deconvolution technique. We have investigated the microstructures in the binary system water (D_2O)/pentaethylene glycol monoperdeutero-n-dodecyl ether (C_(12)D_(25)E_5) and in the ternary system (D_2O)/pentaethylene glycol mono-n-dodecyl ether (C_(12)E_5)/perdeuterated n-octane (C_8D_(18)) by small-angle neutron scattering. Spherical, cylindrical and planar morphologies were induced by changing the temperature of samples with fixed compositions. The same structural sequence exists in both the binary and the ternary mixtures. The spherical, cylindrical and planar structures are observed for water-rich samples by increasing temperature. For oil-rich samples the same structural sequence occurs as function of decreasing temperature. Both for water-rich and oil-rich samples, increasing the surfactant concentration at a constant ratio of surfactant to either oil or water, appropriately, causes the structures become more concentrated, but preserves the local structure and its dimensions.
机译：我们提出了一种从微乳中评估小角度散射数据的程序。通过对测量的小角中子散射（SANS）光谱进行间接傅里叶变换分析，可以得出各种单相样品中结构的独立于模型的图片。数据分析没有对结构类型进行先验假设。而是，对距离分布函数是如此独特，以至于球形，圆柱形或平面几何形状的明确分配是可能的。另外，通过解卷积技术获得垂直于界面的散射长度密度分布。我们研究了二元体系水（D_2O）/五乙二醇单过氘代正十二烷基醚（C_（12）D_（25）E_5）和三元体系（D_2O）/五乙二醇单正十二烷基醚的微观结构（C_（12）E_5）/氘化正辛烷（C_8D_（18））。通过改变具有固定成分的样品的温度来诱导球形，圆柱形和平面形貌。二元和三元混合物中存在相同的结构序列。通过升高温度，可以观察到富水样品的球形，圆柱形和平面结构。对于富含油的样品，随着温度降低，其结构顺序相同。对于富水和富油的样品，以表面活性剂与油或水的恒定比例适当增加表面活性剂的浓度，会导致结构变得更浓缩，但保留了局部结构及其尺寸。

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