Water Nanocluster Formation in the Ionic Liquid 1-Butyl-3-methylimidazolium Tetrafluoroborate ([C4mim][BF4])–D2O Mixtures

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• 作者：Jingsi Gao ; Norman J. Wagner
• 刊名：Langmuir
• 出版年：2016
• 出版时间：May 24, 2016
• 年：2016
• 卷：32
• 期：20
• 页码：5078-5084
• 全文大小：361K
• 年卷期：0
• ISSN：1520-5827

文摘

The microstructure of mixtures of deuterated water in the ionic liquid [C₄mim][BF₄] is investigated by small-angle neutron scattering (SANS) measurement. In the salt-rich region, water dissolves in the ionic liquid up to 0.7 mole fraction, whereupon distinct, nanometer-sized water clusters are observed. These water nanoclusters increase in size with increasing water addition while the mole ratio of water dissolved into the ionic liquid nanostructure increases from 2 to 4. These results provide direct confirmation for recent simulations as well insight into the source of nonidealities in some thermophysical and transport properties (e.g., density and viscosity) of salt-rich aqueous mixtures reported in the literature.