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首页> 外文期刊>Colloids and Surfaces, A. Physicochemical and Engineering Aspects >Behavior of a strong polyelectrolyte, poly(diallyldimethylammonium chloride) physisorbed at oil-water interface under different environments : A comparison with a weak polyelectrolyte
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Behavior of a strong polyelectrolyte, poly(diallyldimethylammonium chloride) physisorbed at oil-water interface under different environments : A comparison with a weak polyelectrolyte

机译:在不同环境下油水界面在油水界面的强聚电解质,聚(二丙二甲基氯化铵)的行为:与弱聚电解质的比较

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摘要

We compare the behavior of a strong polyelectrolyte (PE), poly(diallyldimethylammonium chloride) (PDDA), physisorbed at oil-water interface with that of a weak PE, poly(acrylic acid) under different pH and salt by measuring the interaction forces, zeta potential and hydrodynamic size measurement. The change in interdroplet separation is manifested from the Bragg peak position suggests that PDDA adopts an extended conformation at oil-water interface at zero salt concentration that remains unchanged in the pH range 2-10 but collapses completely at pH 10. At a constant pH, the extended conformation of PDDA remains unaltered at low salt concentration but collapsed completely at high salt content. In case of a weak PE, the adsorbed molecules undergo coil to extended transition with increase in solution pH but swells weakly at very low salt concentration. It collapses strongly at high salt concentration due to condensation of ions over PAA backbones that result in enhanced neutralization of surface group. However, washing of PAA emulsion with lower concentration of monovalent ion leads to desorption of condensed electrolyte ions and re-swelling of PAA. The rate of collapse observed from force measurement in both systems is in agreement with electrophoretic data. Interestingly, the rate of swelling and collapse of the physisorbed weak and strong PE in the presence of salt is remarkably similar to that of end-grafted PE, though the interfaces are entirely different. These results show that interaction of PE's at O/W interface can be used to probe biologically important phenomenon such as macromolecules at cell membrane-fluid interface, binding of protein, adsorption of DNA and protein folding.
机译:我们比较强聚电解质(PE),聚(二烯丙基二甲基氯化铵)(PDDA)的行为,通过测量相互作用力,在不同pH和盐下与弱PE,聚(丙烯酸)在油水界面上。 Zeta电位和流体动力尺寸测量。表明,从布拉格峰位置表现出Interdroplet分离的变化表明,PDDA采用零盐界面的延长构象,其在零盐浓度下在pH范围内保持不变,但在pH&gt中完全坍塌; 10.在恒定的pH下,PDDA的延长构象保持在低盐浓度下不置换,但在高盐含量下完全塌陷。在弱PE的情况下,吸附的分子经历卷材以延长过渡,随着溶液pH的增加,但在极低的盐浓度下弱膨胀。由于PAA骨架上的离子缩合,它在高盐浓度下强烈坍塌,导致表面组的中和的增强。然而,用较低浓度的单价离子洗涤Paa乳液导致冷凝电解质离子的解吸并重新溶胀Paa。在两个系统中从力测量中观察到的崩溃率与电泳数据一致。有趣的是,在盐存在下,物吸收弱和强度Pe的肿胀和塌陷的速率与终端接枝的PE非常相似,尽管界面完全不同。这些结果表明,PE在O / W界面的相互作用可用于探测在细胞膜流体界面,蛋白质结合,DNA和蛋白质折叠的吸附和蛋白质折叠中的生物学上重要的现象。

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