Binary liquid mixtures can exhibit nanosegregation, albeit being fully miscible and homogeneous at the macroscopic scale. This tendency can be amplified by geometrical nanoconfinement, leading to remarkable properties. This work investigates the molecular dynamics of tert-butanol (TBA)–toluene (TOL) mixtures confined in silica nanochannels by quasielastic neutron scattering and molecular dynamics simulation. It reveals a decoupling of the molecular motion of each constituent of the binary liquid, which can be followed independently by selective isotopic H/D labeling. We argue that this behavior is the signature of spatially segregated dynamic heterogeneities, which are due to the recently established core–shell nanophase separation induced by mesoporous confinement.

中文翻译：

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封闭在纳米孔中的液体混合物中的动态异质性

二元液体混合物可表现出纳米偏析，尽管在宏观尺度上是完全可混溶和均匀的。这种趋势可以通过几何纳米约束来放大，从而产生卓越的性能。这项工作通过准弹性中子散射和分子动力学模拟研究了限制在二氧化硅纳米通道中的叔丁醇（TBA）-甲苯（TOL）混合物的分子动力学。它揭示了二元液体每种成分的分子运动的解耦，可以独立进行选择性同位素H / D标记。我们认为，这种行为是空间分隔动态异质性的特征，这是由于最近建立的由中孔禁闭引起的核-壳纳米相分离。