Abstract

The kinetics of adsorption of two polylysine samples with different molecular weights from aqueous solutions on the surface of fused quartz has been studied by the capillary electrokinetics method. It has been found that the adsorption of positively charged polylysine on the negatively charged quartz surface decreases the absolute value of the initial ζ potential; moreover, in the case of polylysine with the higher molecular weight, it leads to the reversal of the surface charge. The constant values of the ζ potential and the times for which these values are reached depend on the molecular weight and concentration of polylysine. The rate of variations in the ζ potential is highest during the first several minutes of the solution contact with the surface. A decrease in the electric conductivity during polylysine adsorption has, for the first time, been observed, thus leading to a hypothesis that large aggregates are formed on the quartz surface. The measurement of the deformability of the layers has shown that, under our experimental conditions, dense undeformable layers are formed. Polylysines are irreversibly adsorbed on the quartz surface.

中文翻译：

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熔融石英表面上聚赖氨酸的吸附

摘要

采用毛细管电动学方法研究了两种分子量不同的聚赖氨酸样品在熔融石英表面上的吸附动力学。已经发现，带正电的聚赖氨酸在带负电的石英表面上的吸附降低了初始ζ电势的绝对值；此外，在具有较高分子量的聚赖氨酸的情况下，其导致表面电荷的逆转。ζ电势的恒定值和达到这些值的时间取决于聚赖氨酸的分子量和浓度。在溶液与表面接触的最初几分钟内，ζ电位的变化率最高。聚赖氨酸吸附过程中电导率的降低首次出现 观察到，因此导致一个假设，即在石英表面上形成大的聚集体。层的可变形性的测量表明，在我们的实验条件下，形成了致密的不可变形层。聚赖氨酸不可逆地吸附在石英表面。