Counterion Specificity of Polyelectrolyte Brushes: Role of Specific Ion-Pairing Interactions.
作者： Ran Kou , Jian Zhang , Zhen Chen , Guangming Liu
关键词: Osmotic pressure 、 Chemistry 、 Chloride 、 Perchlorate 、 Polyelectrolyte 、 Kosmotropic 、 Counterion 、 Chaotropic agent 、 Salt (chemistry) 、 Photochemistry
摘要: We demonstrate here that the properties of poly (2-(methacryloyloxy) ethyl trimethylammonium chloride) brushes can be tuned by counterion species. When are exposed to external chloride (Cl- ) counterions, obvious dehydration and collapse only observed at high salt concentrations. In presence very strongly chaotropic perchlorate (ClO4- ), dehydrate a low concentration. For thiocyanate ion (SCN- changes in hydration conformation similar those for ClO4- but smaller extent With addition kosmotropic acetate (Ac- increases, accompanied swelling low-salt-concentration regime. contrast, with increasing concentration Ac- high-salt-concentration The specificity demonstrated is determined specific ion-pairing interactions through modulating osmotic pressure within hydrophobicity pairs.
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