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This work was partially supported by a grant-in-aid for Scientific Research from the Ministry of Education, Science, Sports and Culture, Japan.
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Sawada, H., Kodama, S., Tsunashima, K. et al. Preparation and properties of novel phosphonium-type ionic liquids/silica gel nanocomposites. J Mater Sci 42, 2532–2535 (2007). https://doi.org/10.1007/s10853-007-1541-x
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DOI: https://doi.org/10.1007/s10853-007-1541-x