This work studied the slow dynamics of liquids with mesoscopic structure and its relation to shear viscosity. Quasielastic scattering measurements were made on a liquid higher alcohol, 3,7-dimethyl-1-octanol, using γ-ray time-domain interferometry at a synchrotron radiation facility, SPring-8. The quasielastic scattering spectra were measured to determine the structural relaxation at two wavenumbers of the prepeak and the main peak of the static structure factor. It was found that relaxation at the prepeak is more than 10 times slower than that at the main peak. Compared with the viscoelastic spectrum, which exhibits bimodal relaxation, the relaxations at the prepeak and the main peak were shown to correspond to the slower and faster modes of the viscoelastic relaxation, respectively. This indicates that the dynamics of the mesoscopic structure represented as the prepeak contributes to the shear viscosity through the slowest mode of the viscoelastic relaxation.

中文翻译：

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具有介观结构的高级醇的结构弛豫和粘弹性

这项工作研究了具有介观结构的液体的慢动力学及其与剪切粘度的关系。在同步加速器辐射设施SPring-8上使用γ射线时域干涉仪对液态高级醇3,7-二甲基-1-辛醇进行准弹性散射测量。测量准弹性散射光谱以确定在前峰的两个波数和静态结构因子的主峰处的结构弛豫。研究发现，峰前的弛豫速度比主峰处的弛豫速度慢10倍以上。与显示双峰弛豫的粘弹性谱相比，在峰前和主峰处的弛豫分别对应于较慢和较快的粘弹性弛豫模式。