Intrinsic Nature of Interfacial Interactions between Ionic Liquids and Rutile TiO2 Single Crystal Surfaces Studied by in Situ Contact Angle Measurement in a Vacuum

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• 作者：Shingo Maruyama ; Yuji Matsumoto
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：August 6, 2015
• 年：2015
• 卷：119
• 期：31
• 页码：17755-17761
• 全文大小：433K
• ISSN：1932-7455

文摘

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鈥檚 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.