Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, NY 14260-3000, USA.
J Chromatogr A. 2009 Dec 25;1216(52):9048-54. doi: 10.1016/j.chroma.2009.08.063. Epub 2009 Aug 27.
Carbon nanoparticles obtained from the flame of an oil lamp were examined by means of capillary electrophoresis. The influence of buffer composition on the separation of the mixture of negatively charged carbon nanoparticles was studied by varying buffer selection, pH, and concentration. The electrophoretic pattern was affected by both the co- and counter-ion in the buffer solution, influencing selectivity and peak shape. The capillary electrophoretic separations at different pH revealed species with large electrophoretic mobilities under a wide range of pH. The mobility of selected species in the mixture of nanoparticles showed a strong dependence upon the solution ionic strength. The mobility of these nanoparticles as a function of ionic strength was compared to classical electrokinetic theory, suggesting that under the experimental conditions utilized, the species are small, highly charged particles with appreciable zeta potentials, even at low pH.
通过毛细管电泳研究了从油灯火焰中获得的碳纳米粒子。通过改变缓冲液选择、pH 值和浓度，研究了缓冲液组成对带负电荷的碳纳米粒子混合物分离的影响。电泳模式受缓冲液溶液中的共离子和抗衡离子的影响，影响选择性和峰形。在不同 pH 值下的毛细管电泳分离揭示了在很宽的 pH 范围内具有大电泳迁移率的物种。混合物中选定物种的迁移率强烈依赖于溶液的离子强度。将这些纳米粒子的迁移率与经典电泳动力学理论进行了比较，结果表明，在所使用的实验条件下，这些物质是小的、带高电荷的粒子，即使在低 pH 值下，也具有可观的 ζ 电位。
Zotero 插件