SUPA, COSMIC and School of Physics and Astronomy, The University of Edinburgh, King's Buildings, Mayfield Road, Edinburgh EH9 3JZ, United Kingdom.
J Chem Phys. 2011 Feb 7;134(5):054505. doi: 10.1063/1.3525101.
Intermediate scattering functions are measured for colloidal hard sphere systems using both dynamic light scattering and x-ray photon correlation spectroscopy. We compare the techniques, and discuss the advantages and disadvantages of each. Both techniques agree in the overlapping range of scattering vectors. We investigate the scaling behavior found by Segré and Pusey [Phys. Rev. Lett. 77, 771 (1996)] but challenged by Lurio et al. [Phys. Rev. Lett. 84, 785 (2000)]. We observe a scaling behavior over several decades in time but not in the long-time regime. Moreover, we do not observe long-time diffusive regimes at scattering vectors away from the peak of the structure factor and so question the existence of long-time diffusion coefficients at these scattering vectors.
使用动态光散射和 X 射线光子相关光谱法测量胶体硬球系统的中间散射函数。我们比较了这两种技术，并讨论了每种技术的优缺点。在散射矢量的重叠范围内，两种技术都一致。我们研究了 Segré 和 Pusey [Phys. Rev. Lett. 77, 771 (1996)] 发现的标度行为，但受到了 Lurio 等人的挑战 [Phys. Rev. Lett. 84, 785 (2000)]。我们在几个时间尺度上观察到了标度行为，但在长时间范围内没有观察到。此外，我们在远离结构因子峰值的散射矢量处没有观察到长时间的扩散状态，因此对这些散射矢量处是否存在长时间扩散系数提出了质疑。
