Mhanna Ramona, Catrou Pierre, Dutta Sujeet, Lefort Ronan, Essafri Ilham, Ghoufi Aziz, Muthmann Matthias, Zamponi Michaela, Frick Bernhard, Morineau Denis
Institute of Physics of Rennes, CNRS-University of Rennes 1, UMR 6251, F-35042 Rennes, France.
Institut Laue-Langevin, 71 avenue des Martyrs, F-38000 Grenoble, France.
J Phys Chem B. 2020 Apr 16;124(15):3152-3162. doi: 10.1021/acs.jpcb.0c01035. Epub 2020 Apr 2.
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 -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.
二元液体混合物尽管在宏观尺度上是完全互溶且均匀的，但仍可表现出纳米级相分离。这种趋势可通过几何纳米限域作用得到增强，从而产生显著的特性。本研究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。研究揭示了二元液体各组分分子运动的解耦，这可以通过选择性同位素H/D标记独立追踪。我们认为这种行为是空间分离的动态不均匀性的标志，这是由于最近由介孔限域诱导的核壳纳米相分离所致。
