Zeta potential determination with a microchannel fabricated in solidified solvents
Zeta potential determination with a microchannel fabricated in solidified solvents
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DOI：
10.1016/j.jcis.2018.07.137
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发表时间：
2018-12-15
影响因子：
9.9
通讯作者：
Okada, Tetsuo
中科院分区：
文献类型：
--
作者：
Inagawa, Arinori;Fukuyama, Mao;Okada, Tetsuo
本文提出了一种简单且通用的方法来测定通道壁的 zeta 电位，并讨论了冷冻溶剂表面的测量值，这不仅具有科学意义，而且对于微流体平台也具有潜在用途。固体表面的zeta电位是讨论其电动特性、双电层中离子的分布和反应以及表面包围的空间中的流体行为的重要参数。虽然胶体物质的 Zeta 电位可以通过其电泳迁移率来确定，但通常很难确定块体材料的 Zeta 电位。在本文中，通过测量作为探针的微粒的表观迁移率来确定在冷冻溶剂中制造的微通道的zeta电位。已经使用微芯片电泳在各种条件下预先测量了微粒的电泳迁移率。这种方法使我们能够确定水冰和冷冻环己烷的 zeta 电位。我们讨论了冰的 zeta 电位的 pH 依赖性，以及 NaCl 浓度对冰和冷冻环己烷的影响。 (C) 2018 Elsevier Inc. 保留所有权利。
This paper proposes a simple and versatile method for the determination of the zeta potential of a channel wall and discusses the values measured for the surface of frozen solvents, which are not only of scientific interest but also of potential use for microfluidic platforms. The zeta potential of the solid surface is an important parameter for discussing its electrokinetic properties, the distribution and reaction of ions in an electric double layer, and the fluidic behavior in the space surrounded by the surface. While the zeta potential of colloidal matters can be determined from their electrophoretic mobility, it is often difficult to determine that of a bulk material. In this paper, the zeta potential of a microchannel fabricated in a frozen solvent is determined by measuring the apparent mobility of microparticles as the probe. The electrophoretic mobility of the microparticles has been measured in advance using microchip electrophoresis under various conditions. This approach allows us to determine the zeta potential of water-ice and frozen cyclohexane. We discuss the pH dependence of the zeta potential of ice and also effects of the NaCl concentration on that of ice and frozen cyclohexane. (C) 2018 Elsevier Inc. All rights reserved.