Evanescent‐wave particle velocimetry measurements of zeta‐potentials in fused‐silica microchannels
Evanescent‐wave particle velocimetry measurements of zeta‐potentials in fused‐silica microchannels
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熔融石英微通道中 zeta 电位的倏逝波粒子测速法测量
DOI：
10.1002/elps.201300083
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发表时间：
2013
期刊：
影响因子：
2.9
通讯作者：
M. Yoda
中科院分区：
文献类型：
--
作者：
N. Cevheri;M. Yoda
壁面电位Ekw，即双电层剪切面处的电位，取决于BGE溶液的性质，如电解质的价态和类型、pH值和离子强度。大多数的方法估计从测量的平均速度幅值ueo，通常在整个毛细管空间平均。在这些初步研究中，使用渐逝波粒子测速法测量各种单价水溶液在稳定pH下的ueo，以评估少量二价阳离子的影响，以及BGE溶液的pH和离子强度。简而言之，根据33 μm熔融二氧化硅微通道中半径α = 104 nm荧光聚苯乙烯颗粒的测量速度来估计NaCl-NaOH和硼酸盐缓冲液-NaOH溶液的EOF速度大小。使用激光多普勒微电泳分别测量颗粒的α-电位;然后从ueo确定α-w。结果表明，倏逝波粒子测速法可用于估计各种BGE解决方案的BMWW，并且它可在未来用于估计局部壁面势能，从而估计BMWW的空间变化。
The wall ζ‐potential ζw, the potential at the shear plane of the electric double layer, depends on the properties of the BGE solution such as the valence and type of electrolyte, the pH and the ionic strength. Most of the methods estimate ζw from measurements of the EOF velocity magnitude ueo, usually spatially averaged over the entire capillary. In these initial studies, evanescent‐wave particle velocimetry was used to measure ueo in steady EOF for a variety of monovalent aqueous solutions to evaluate the effect of small amounts of divalent cations, as well as the pH and ionic strength of BGE solutions. In brief, the magnitude of the EOF velocity of NaCl‐NaOH and borate buffer‐NaOH solutions was estimated from the measured velocities of radius α = 104 nm fluorescent polystyrene particles in 33 μm fused‐silica microchannels. The particle ζ‐potentials were measured separately using laser‐Doppler micro‐electrophoresis; ζw was then determined from ueo. The results suggest that evanescent‐wave particle velocimetry can be used to estimate ζw for a variety of BGE solutions, and that it can be used in the future to estimate local wall ζ‐potential, and hence spatial variations in ζw.
影响因子：
2.4
作者：
Datta S;Conlisk AT;Li HF;Yoda M
通讯作者：
Yoda M