تقرير
Molecular Structural Dynamics in Water-Ethanol Mixtures: Spectroscopy with Polarized Neutrons Simultaneously Accessing Collective and Self-Diffusion
| العنوان: | Molecular Structural Dynamics in Water-Ethanol Mixtures: Spectroscopy with Polarized Neutrons Simultaneously Accessing Collective and Self-Diffusion |
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| المؤلفون: | Morbidini, Riccardo, Edkins, Robert M., Devonport, Mark, Nilsen, Gøran, Seydel, Tilo, Edkins, Katharina |
| سنة النشر: | 2023 |
| المجموعة: | Condensed Matter Physics (Other) |
| مصطلحات موضوعية: | Condensed Matter - Soft Condensed Matter, Physics - Chemical Physics |
| الوصف: | Binary mixtures of water with lower alcohols display non-linear phase behaviour upon mixing which are attributed to potential cluster formation at molecular level. Unravelling such elusive structures requires the investigation of hydrogen-bonding sub-nanosecond dynamics. We employ high-resolution neutron time-of-flight spectroscopy with polarization analysis in combination with selective deuteration to study the concentration-dependent structural dynamics, in the water rich part of the phase diagram of water-ethanol mixtures. This method enables the simultaneous access to atomic correlations in space and time, and allows us to separate spatially incoherent scattering probing self-diffusion of the ethanol fraction from the coherent scattering probing collective diffusion of the water network as a whole. Our observations indicate an enhanced rigidity of the hydrogen bond network at mesoscopic lengthscale compared to the intra-molecular scale as the ethanol fraction increases, which is consistent with the hypothesis of clusters. |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2310.04320 |
| رقم الأكسشن: | edsarx.2310.04320 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |