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首页> 外文期刊>Chemistry: A European journal >Sodium effect on self-organization of amphiphilic carboxylates: Formation of structured micelles and superlattices
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Sodium effect on self-organization of amphiphilic carboxylates: Formation of structured micelles and superlattices

机译：钠对两亲性羧酸盐自组织的影响：结构化胶束和超晶格的形成

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摘要

Not only the self-aggregation of dendritic polycarboxylates intostructurally persistent micelles, but also that of the micelles themselves into superlatticesis controlled by alkali-metalcounterions and shows a pronounced sodium effect. Our combined experimental and computational work has revealed the formation of superlattices for the first time. The behavior of a variety of amphiphilic carboxylates and the different effects of the alkali cations Li~+, Na~+, and K~+ have been investigated by conductivity measurements, cryogenic transmission electron microscopy (cryo-TEM), and molecular-dynamics (MD) simulations. Together, these show that sodium salts of the amphiphiles give the most stable micelles, followed by lithium and potassium. Our results suggest that ion multiplets in bridging positions, rather than contact ion pairs, are responsible for the enhanced stability and the formation of hexagonally ordered superlattices with sodium counter ions. Potassium ions do not form such ion multiplets and cannot therefore induce aggregation of the micelles. This sodium effect has far-reaching consequences for a large number of biological and technical systems and sheds new light on the origin of specific-ion effects.
机译：不仅树突状多羧酸盐的自聚集成为结构上持久的胶束，而且胶束自身的聚集也变成由碱金属抗衡剂控制的超晶格，并表现出明显的钠效应。我们结合实验和计算工作，首次揭示了超晶格的形成。通过电导率测量，低温透射电子显微镜（cryo-TEM）和分子动力学研究了多种两亲羧酸盐的行为以及碱金属阳离子Li〜+，Na〜+和K〜+的不同作用（ MD）模拟。总之，这些表明两亲物的钠盐给出最稳定的胶束，其次是锂和钾。我们的结果表明，桥接位置的离子多重峰，而不是接触离子对，是钠稳定性离子增强稳定性和形成六角有序超晶格的原因。钾离子不会形成这种离子多重峰，因此不能诱导胶束聚集。钠效应对大量的生物和技术系统具有深远的影响，并为特异性离子效应的起源提供了新的思路。

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