Spontaneous formations of nanoconfined water in ionic liquids by small-angle neutron scattering

Abe, Hiroshi*; Nemoto, Fumiya*; Hiroi, Kosuke ; Oishi, Kazuki*; Takata, Shinichi

In this study, monodispersive nanoconfined water ("water pocket") is organized spontaneously in hydrophilic ionic liquid (IL). The IL is 1-alkyl-3-methylimidazolium nitrate ([C $_{n}$ mim][NO $_{3}$ ] = 2, 6, and 8). By small-angle neutron scattering (SANS), D $_{2}$ O aggregations in the IL are detected. There are no SANS peaks for [C $_{2}$ mim][NO $_{3}$ ]-D $_{2}$ O, but, in [C $_{6}$ mim][NO $_{3}$ ]- mol% D $_{2}$ O, a SANS peak can be observed at mol%. The peak intensity, position, and profile change according to water concentration and temperature. Pure [C $_{8}$ mim][NO $_{3}$ ] has a distinct SANS peak, reflecting on the nanodomains at room temperature. Above 70 mol%, the SANS peak of [C $_{8}$ mim][NO $_{3}$ ]-D $_{2}$ O sharply increases and shifts to the low-Q position. The water pocket develops proportionate to water concentration, and its morphologies are visualized using an bead model. The alkyl chain length dependence of the water pocket is clarified by a three-dimensional reconstruction method.

Language	:	English
Journal	:	Journal of Molecular Liquids
Volume	:	346
Number	:
Pages	:	p.117035_1 - 117035_6
Publication Year/Month	:	2022/01
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Paper URL	:	https://doi.org/10.1016/j.molliq.2021.117035
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Keywords	:	no keyword
Research Facility	:	J-PARC物質・生命科学実験施設
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Registration No. : AA20221018
JAEA Abstracts No. : 52000250
Paper Submission No. : 27673

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