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Abstract：
During the last years, several authors have focused on the characterization of the size and charge of the nanoparticles by capillary electrophoresis. However, considering that nanoparticles are generally suspended in a solvent different from those commonly used as background electrolytes (BGE), an appropriate characterization of the behavior of the nanoparticles in the sample-BGE interface is required, as this might affect the overall electrophoretic behavior of the nanoparticles. In the present work, we address the evaluation of the behavior of COOH-coated maghemite nanoparticles in the vicinity of a pH boundary. To do so, different suspensions of nanoparticles prepared in acid media were injected into a borate/NaOH pH 9.5 BGE. The formation and evolution of boundaries in the sample-BGE interface in such systems was modeled by computer simulation. A systematic evaluation of the effect that parameters such as the co-ion, the sample pH or the injection time have on the electrophoretic behavior of the nanoparticles was carried out.
摘要：
在过去的几年里，一些作者专注于通过毛细管电泳表征纳米粒子的大小和电荷。然而,考虑到纳米颗粒通常悬浮在不同于通常用作背景电解质（BGE）的溶剂中，需要对样品-BGE界面中纳米颗粒的行为进行适当的表征，因为这可能会影响纳米粒子的整体电泳行为。在目前的工作中,我们致力于评估COOH包覆的磁赤铁矿纳米颗粒在pH边界附近的行为。要做到这一点，将在酸性介质中制备的纳米颗粒的不同悬浮液注射到硼酸盐/NaOHpH9.5BGE中。通过计算机模拟对此类系统中样品-BGE界面中边界的形成和演化进行了建模。对共离子等参数的影响进行系统评估，样品的pH值或注入时间对纳米粒子的电泳行为进行了研究。
