Department of Inorganic, Analytical, and Applied Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1205 Geneva, Switzerland.
Langmuir. 2011 Aug 2;27(15):9270-6. doi: 10.1021/la201968b. Epub 2011 Jul 11.
Positively charged amidine latex particles are studied in the presence of poly(acrylic acid) (PAA) with different molecular masses under neutral and acidic conditions by electrophoresis and time-resolved dynamic light scattering. Under neutral conditions, where PAA is highly charged, the system is governed by the charge reversal induced by the quantitatively adsorbing polyelectrolyte and attractive patch-charge interactions. Under acidic conditions, where PAA is more weakly charged, the following two effects come into play. First, the lateral structure of the adsorbed layers becomes more homogeneous, which weakens the attractive patch-charge interactions. Second, polyelectrolyte adsorption is no longer quantitative and partitioning into the solution phase is observed, especially for PAA of low molecular mass.
正电荷胍基乳胶颗粒在中性和酸性条件下，与不同分子量的聚(丙烯酸)（PAA）一起通过电泳和时间分辨动态光散射进行研究。在 PAA 带高电荷的中性条件下，该体系受定量吸附聚电解质诱导的电荷反转和吸引力斑状电荷相互作用控制。在 PAA 带较弱电荷的酸性条件下，以下两种效应开始起作用。首先，吸附层的横向结构变得更加均匀，从而减弱了吸引力斑状电荷相互作用。其次，聚电解质吸附不再是定量的，观察到部分聚电解质分配到溶液相中，尤其是对于低分子量的 PAA。
