Brownian and advective dynamics in microflow studied by coherent X-ray scattering experiments.
Brownian and advective dynamics in microflow studied by coherent X-ray scattering experiments.
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通过相干 X 射线散射实验研究微流中的布朗动力学和平流动力学。
DOI：
10.1107/s1600577516012613
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发表时间：
2016
影响因子：
2.5
通讯作者：
T. Pfohl
中科院分区：
文献类型：
--
作者：
Raphael Urbani;F. Westermeier;Benjamin Banusch;M. Sprung;T. Pfohl
将微流体技术与相干X射线照明相结合，不仅可以在单次散射实验中测量流动样品的结构，还可以测量流动样品的动力学。在这里，通过研究不同几何形状的微流中胶体悬浮液的平流和布朗动力学，证明了这种组合的力量。使用具有快速二维检测器的实验装置并通过计算强度自相关函数的二维图来执行X射线相关光谱，可以评估样品结构并进一步表征详细的流动行为，包括流动几何形状、主流方向、平流速度和扩散动力学。通过微聚焦X射线束在微流控装置上的扫描，利用X射线束的空间分辨率映射了直、弯曲和收缩微通道中胶体悬浮液的各向异性自相关函数。这种方法不仅在研究复杂流体中的流动模式方面具有巨大的潜力，而且在一般情况下表征材料中的各向异性动力学。
Combining microfluidics with coherent X-ray illumination offers the possibility to not only measure the structure but also the dynamics of flowing samples in a single-scattering experiment. Here, the power of this combination is demonstrated by studying the advective and Brownian dynamics of colloidal suspensions in microflow of different geometries. Using an experimental setup with a fast two-dimensional detector and performing X-ray correlation spectroscopy by calculating two-dimensional maps of the intensity auto-correlation functions, it was possible to evaluate the sample structure and furthermore to characterize the detailed flow behavior, including flow geometry, main flow directions, advective flow velocities and diffusive dynamics. By scanning a microfocused X-ray beam over a microfluidic device, the anisotropic auto-correlation functions of driven colloidal suspensions in straight, curved and constricted microchannels were mapped with the spatial resolution of the X-ray beam. This method has not only a huge potential for studying flow patterns in complex fluids but also to generally characterize anisotropic dynamics in materials.
影响因子：
8.6
作者：
B. Weinhausen;Oliva Saldanha;R. Wilke;C. Dammann;M. Priebe;M. Burghammer;M. Sprung;S. Köster
通讯作者：
B. Weinhausen;Oliva Saldanha;R. Wilke;C. Dammann;M. Priebe;M. Burghammer;M. Sprung;S. Köster