Investigation of confined ionic liquid in nanostructured materials by a combination of SANS, contrast-matching SANS, and nitrogen adsorption |
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Authors: | Stefanopoulos Konstantinos L Romanos George E Vangeli Olga C Mergia Konstantina Kanellopoulos Nick K Koutsioubas Alexandros Lairez Didier |
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Affiliation: | Institute of Physical Chemistry, NCSR Demokritos, 15310 Ag. Paraskevi Attikis, Athens, Greece. stefan@chem.demokritos.gr |
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Abstract: | Small-angle neutron scattering (SANS), contrast-matching SANS, and nitrogen adsorption have been utilized to investigate the confined ionic liquid (IL) [bmim][PF(6)] phase in ordered mesoporous silica MCM-41 and SBA-15. The results suggest that the pores of SBA-15 are completely filled with IL whereas a small fraction of the pore volume, the pore "core", of MCM-41 is empty. The contrast-matching SANS measurements confirm the enhanced solubility of water in IL. In addition, they provide strong evidence that water does not enter the empty pore core of MCM-41, possibly because of the preferred orientation of the IL molecules in the adsorbed layer. |
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