Electro-kinetics of charged-sphere suspensions explored by integral low-angle super-heterodyne laser Doppler velocimetry

Electro-kinetics of charged-sphere suspensions explored by integral low-angle super-heterodyne laser Doppler velocimetry
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通过积分低角度超外差激光多普勒测速探索带电球悬浮体的电动学

DOI:
10.1088/0953-8984/24/46/464109
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发表时间:
2012
期刊:
Journal of Physics: Condensed Matter
影响因子:
--
通讯作者:
G. Nägele
G. Nägele
中科院分区:
--
文献类型:
--
作者:
T. Palberg;T. K¨oller;B. Sieber;H. Schweinfurth;H. Reiber;G. Nägele

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我们研究了胶体带电球悬浮液的流动行为,使用一个新设计的整体低角度超外差激光多普勒测速仪,它结合了以前的几种方法的优点。样品条件范围从强静电相互作用与显着的短程秩序,个别粒子没有空间相关性。所获得的功率谱对应于整个样品横截面的扩散加宽的速度分布。该仪器的优异性能是突出详细的例子电动悬浮液在一个封闭的单元中的矩形横截面。我们证明了我们的方法的电泳电渗实验的例子,表明一个全面的流动表征成为可能,通过分析测得的电动迁移率,流量剖面,有效的扩散系数和综合散射密度的优异性能。我们简要讨论目前的限制,可能的扩展和有趣的应用在其他领域。
We investigated the flow behaviour of colloidal charged-sphere suspensions using a newly designed integral low-angle super-heterodyne laser Doppler velocimetry instrument, which combines the advantages of several previous approaches. Sample conditions ranged from strong electrostatic interactions with pronounced short-range order to individual particles with no spatial correlations. The obtained power spectra correspond to diffusion broadened velocity distributions across the complete sample cross section. The excellent performance of the instrument is highlighted in detail by the example of electro-kinetic flow of suspensions in a closed cell of a rectangular cross section. We demonstrate the excellent performance of our approach with the example of electro-phoretic–electro-osmotic experiments, showing that a comprehensive flow characterization becomes possible by analysing the measured electro-kinetic mobilities, the flow-profile, an effective diffusion coefficient and the integrated scattering density. We briefly discuss present limitations, possible extensions and interesting applications in other fields.
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