Shielding behavior of electrokinetic properties of polystyrene latex particle by the adsorption of neutral poly(ethylene oxide)
Shielding behavior of electrokinetic properties of polystyrene latex particle by the adsorption of neutral poly(ethylene oxide)
复制标题
中性聚环氧乙烷吸附对聚苯乙烯乳胶粒子动电性能的屏蔽行为
DOI：
10.1016/j.jcis.2022.06.154
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发表时间：
2022
影响因子：
9.9
通讯作者：
Adachi Yasuhisa
中科院分区：
文献类型：
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作者：
Saha Santanu;Adachi Yasuhisa
为了了解聚合物涂层对胶体粒子电动力学的屏蔽作用，我们测量了带负电的聚苯硫酸酯胶乳(PSL)在不同离子强度下吸附在不同相对分子质量的中性聚氧乙烯(PEO)链上的凝胶迁移率。我们证实了大量吸附在颗粒表面的中性聚合物会降低电泳率的绝对值。即使聚合物层比双电层(EDL)的厚度足够厚，但电泳迁移率(EPM)永远不会消失，这表明吸附的中性聚合物对电动屏蔽是不完整的。为了描述这种有趣的现象，我们提出了一个简单的数学模型来评估电泳膜的迁移率，假设吸附的可渗透聚合物层的标度结构的存在不影响离子在双电层(EDL)中的泊松-玻尔兹曼分布。用Ohshima-Kondo理论推导出了德拜-胡克尔近似下的电泳迁移率的解析表达式，成功地证明了实验数据的正确性。
To understand the shielding of electrokinetics of colloidal particles by polymer coating, we measured the electrophoretic mobility of negatively charged polystyrene sulfate latex (PSL) adsorbed with electrostatically neutral polyethylene oxide (PEO) chains with various molecular weights under different ionic strengths. We confirmed that substantial adsorbed neutral polymer on the particle surface would decrease the absolute value of electrophoretic mobility. Even though the polymer layer is sufficiently thicker compared to the thickness of electric double layer (EDL), the electrophoretic mobility (EPM) never vanishes, which indicates the incompleteness of electrokinetic shielding by an adsorbed neutral polymer. To relate such interesting phenomena, a simple mathematical model has been proposed to evaluate the electrophoretic mobility, assuming the presence of a scaling structure of adsorbed permeable polymer layer does not influence the Poisson–Boltzmann distribution of ions in the electric double layer (EDL). An analytical expression of electrophoretic mobility under Debye-H u¨ ckel approximation has been derived using the method of Ohshima-Kondo theory, which successfully justifies the experimentally obtained data.