Anomalous Freezing of Nano‐Confined Water in Room‐Temperature Ionic Liquid 1‐Butyl‐3‐Methylimidazolium Nitrate |
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| Authors: | Prof Hiroshi Abe Dr Takahiro Takekiyo Prof Yukihiro Yoshimura Koji Saihara Prof Akio Shimizu |
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| Affiliation: | 1. Department of Materials Science and Engineering, National Defense Academy, Yokosuka, Kanagawa, Japan;2. Department of Applied Chemistry, National Defense Academy, Yokosuka, Kanagawa, Japan;3. Graduate school of Environmental Engineering for Symbiosis, Soka University, Hachioji, Tokyo, Japan |
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| Abstract: | Non‐crystal formation of ice is investigated by simultaneous X‐ray diffraction and differential scanning calorimetry measurements upon cooling to ?100 °C. At room temperature, size‐tunable water confinement (≈20 Å size) in a room‐temperature ionic liquid (RTIL, 1‐butyl‐3‐methylimidazolium nitrate, C4mim]NO3]) exists in a water‐rich region (70–90 mol % D2O). The confined water (water pocket) is characterized by almost monodispersive size distribution. In C4mim]NO3]‐x mol % D2O (70<x<94), the absence of sharp Bragg reflections and a distinct exothermal peak indicate that crystallization/cold crystallization both of C4mim]NO3] and D2O is suppressed, even upon slow cooling and heating. |
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| Keywords: | anomalous freezing crystal polymorphs nano-confined amorphous ice nano-confinement in liquids ionic liquids |
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