乙醇中低离子强度下模型二氧化硅胶体的电泳迁移率和动态迁移率的差异
Diverging electrophoretic and dynamic mobility of model silica colloids at low ionic strength in ethanol.
作者信息
Kortschot R J, Lyklema J, Philipse A P, Erné B H
机构信息
Van 't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute for Nanomaterials Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands.
Laboratory for Physical Chemistry and Colloid Science of Wageningen University, Dreijenplein 6, 6703 HB Wageningen, The Netherlands.
出版信息
J Colloid Interface Sci. 2014 May 15;422:65-70. doi: 10.1016/j.jcis.2014.02.011. Epub 2014 Feb 20.
Electroacoustics and laser Doppler electrophoresis were employed to measure the mobility of surface-modified silica colloids in ethanol as a function of the ionic strength. Sufficiently low volume fractions were chosen to exclude effects of interparticle interactions. At high ionic strength, the electrophoretic mobility μ(e) is equal to the (electroacoustic) dynamic mobility μ(d) at 3.3 MHz. However, the ratio μ(d)/μ(e) increases significantly to ∼5 at low ionic strength. This increase may be related to the porous outer layer of the surface-modified silica spheres.
采用电声学和激光多普勒电泳技术来测量表面改性二氧化硅胶体在乙醇中作为离子强度函数的迁移率。选择足够低的体积分数以排除颗粒间相互作用的影响。在高离子强度下，3.3MHz时的电泳迁移率μ(e)等于（电声）动态迁移率μ(d)。然而，在低离子强度下，μ(d)/μ(e)的比值显著增加至约5。这种增加可能与表面改性二氧化硅球的多孔外层有关。
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