利用光子相关成像解决堵塞胶体系统中的长程空间相关性
Resolving long-range spatial correlations in jammed colloidal systems using photon correlation imaging
摘要：
我们介绍了一种新的动态光散射方法，称为光子相关成像，它使我们能够解决软物质在空间和时间的动力学。我们证明光子相关成像通过调查的准二维粗化泡沫制成的高度包装，可变形的气泡和一个刚性的凝胶网络形成的稀释，有吸引力的胶体颗粒的缓慢动力学。我们发现这两个系统的动态是由间歇性重排事件。对于泡沫，重排延伸到几个气泡，但一个小的动态相关性观察到宏观长度尺度。对于凝胶，动力学相关性延伸到系统的大小。这些结果表明，在堵塞的系统中，动力学相关性可以是非常长的范围，并指出机械性能在确定其性质方面的关键作用。
英文摘要：
We introduce a new dynamic light scattering method, termed photon correlation imaging, which enables us to resolve the dynamics of soft matter in space and time. We demonstrate photon correlation imaging by investigating the slow dynamics of a quasi two-dimensional coarsening foam made of highly packed, deformable bubbles and a rigid gel network formed by dilute, attractive colloidal particles. We find the dynamics of both systems to be determined by intermittent rearrangement events. For the foam, the rearrangements extend over a few bubbles, but a small dynamical correlation is observed up to macroscopic length scales. For the gel, dynamical correlations extend up to the system size. These results indicate that dynamical correlations can be extremely long-ranged in jammed systems and point to the key role of mechanical properties in determining their nature.
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