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arXiv 1708.02003cond-mat.soft
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电渗泵和模块化微泳过程中高分辨率pH-characterization的大规模显微光度测量

Large scale Micro-Photometry for high resolution pH-characterization during electro-osmotic pumping and modular micro-swimming

Ran Niu, Stanislav Khodorov, Julian Weber, Alexander Reinmüller, Thomas Palberg

摘要:

微流控泵以及人工微游泳者方便地实现利用泳动溶剂流量的基础上,局部梯度的温度,电解质浓度或pH值。在这里,我们提出了一种简便的微光度法监测pH梯度,并证明其性能和范围上不同的实验情况,包括电渗泵和模块化的微游泳者组装的离子交换树脂珠和聚苯乙烯胶体。结合目前的显微镜和DSLR相机,我们的方法在3920 × 2602 μm^2的视场内以视频帧速率提供了2 μm的空间分辨率。在最佳条件下,我们实现了约相等的贡献,统计和系统的不确定性的pH值为0.05的分辨率。我们的定量微光度表征的pH梯度的发展,在时间和达到几毫米预计提供有价值的输入可靠的建模和模拟的各种复杂的流动情况,涉及pH梯度,包括人工微游泳,微流体泵送,甚至电对流。

英文摘要:

Micro-fluidic pumps as well as artificial micro-swimmers are conveniently realized exploiting phoretic solvent flows based on local gradients of temperature, electrolyte concentration or pH. We here present a facile micro-photometric method for monitoring pH gradients and demonstrate its performance and scope on different experimental situations including an electro-osmotic pump and modular micro-swimmers assembled from ion exchange resin beads and polystyrene colloids. In combination with the present microscope and DSLR camera our method offers a 2 μm spatial resolution at video frame rate over a field of view of 3920x2602 μm^2. Under optimal conditions we achieve a pH-resolution of 0.05 with about equal contributions from statistical and systematical uncertainties. Our quantitative micro-photometric characterization of pH gradients which develop in time and reach out several mm is anticipated to provide valuable input for reliable modeling and simulations of a large variety of complex flow situations involving pH-gradients including artificial micro-swimmers, microfluidic pumping or even electro-convection.

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