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arXiv 0903.2303cond-mat.soft
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亲水性和疏水性离子在二元混合物中诱导的洋葱结构

Onion structures induced by hydrophilic and hydrophobic ions in a binary mixture

Koichiro Sadakane, Akira Onuki, Koji Nishida, Satoshi Koizumi, Hideki Seto

摘要:

在含有85 mM盐的D $_2$ O和3-甲基吡啶(3 MP)的非临界混合物中,观察到单相无序相和具有多层(洋葱)结构的有序相之间的相变。该盐由亲水性阳离子和疏水性阴离子组成,它们与诱导中间相的溶剂组成波动不对称地相互作用。从小角中子散射得到的组成分布的结构因子在无序相中的中间波数处有一个峰,在有序相中有多个峰。形成洋葱的层片层由溶剂化诱导的被D $_2$ O溶胀的带电膜组成。洋葱状相仅在小体积分数的3 MP(在富含D $_2$ O的溶剂中)下实现。

英文摘要:

Phase transition is observed between one-phase disordered phase and an ordered phase with multi-lamellar (onion) structures in an off-critical mixture of D$_2$O and 3-methylpyridine (3MP) containing a salt at 85mM. The salt consists of hydrophilic cations and hydrophobic anions, which interact asymmetrically with the solvent composition fluctuations inducing mesophases. The structure factor of the composition distribution obtained from small-angle neutron scattering has a peak at an intermediate wave number in the disordered phase and multiple peaks in the ordered phase. Lamellar layers forming onions are composed of solvation-induced charged membranes swollen by D$_2$O. The onion phase is realized only for small volume fractions of 3MP (in D$_2$O-rich solvent).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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