TY - JOUR
T1 - Intrinsic Nature of Interfacial Interactions between Ionic Liquids and Rutile TiO2 Single Crystal Surfaces Studied by in Situ Contact Angle Measurement in a Vacuum
AU - Maruyama, Shingo
AU - Matsumoto, Yuji
N1 - Publisher Copyright:
© 2015 American Chemical Society.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2015/8/6
Y1 - 2015/8/6
N2 - In situ contact angle measurements of ionic liquids (ILs) on well-defined rutile TiO2 single crystal surfaces with various treatments were performed in a vacuum by a sessile drop method. The contact angles of ILs on the clean TiO2 surfaces prepared in vacuum were significantly smaller than on those contaminated with airborne hydrocarbon. As a result, there was revealed a different correlation in Zisman's plots of the hydrophobic and hydrophilic ILs, which was further confirmed by their different wettability change on the hydrophilized TiO2 surface with UV light treatment in air. In addition, the critical surface tension on the vacuum-annealed TiO2 surface was lower than on the initial clean surface. These results will be qualitatively discussed by considering the polar and apolar interactions at the interface between ILs and TiO2.
AB - In situ contact angle measurements of ionic liquids (ILs) on well-defined rutile TiO2 single crystal surfaces with various treatments were performed in a vacuum by a sessile drop method. The contact angles of ILs on the clean TiO2 surfaces prepared in vacuum were significantly smaller than on those contaminated with airborne hydrocarbon. As a result, there was revealed a different correlation in Zisman's plots of the hydrophobic and hydrophilic ILs, which was further confirmed by their different wettability change on the hydrophilized TiO2 surface with UV light treatment in air. In addition, the critical surface tension on the vacuum-annealed TiO2 surface was lower than on the initial clean surface. These results will be qualitatively discussed by considering the polar and apolar interactions at the interface between ILs and TiO2.
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U2 - 10.1021/acs.jpcc.5b05276
DO - 10.1021/acs.jpcc.5b05276
M3 - Article
AN - SCOPUS:84938718709
VL - 119
SP - 17755
EP - 17761
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 31
ER -