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

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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通过真空原位接触角测量研究离子液体与金红石 TiO2 单晶表面之间界面相互作用的本质

DOI:
10.1021/acs.jpcc.5b05276
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发表时间:
2015
期刊:
J. Phys. Chem. C.
影响因子:
--
通讯作者:
Yuji Matsumoto
Yuji Matsumoto
中科院分区:
--
文献类型:
--
作者:
Shingo Maruyama;Yuji Matsumoto

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用座滴法在真空中原位测量了离子液体(ILS)在金红石型二氧化钛单晶表面不同处理后的接触角。离子液体在真空中制备的清洁二氧化钛表面上的接触角明显小于空气中碳氢化合物污染的表面。结果表明,疏水性和亲水性ILS的Zisman曲线具有不同的相关性,进一步证实了它们在空气中经紫外光处理后在亲水性TiO2表面的不同润湿性变化。另外,真空退火后的二氧化钛表面的临界表面张力低于清洁前的表面张力。这些结果将通过考虑ILS和TiO2界面上的极性相互作用和非极相互作用进行定性的讨论。
In situ contact angle measurements of ionic liquids (ILs) on well-defined rutile TiO2single crystal surfaces with various treatments were performed in a vacuum by a sessile drop method. The contact angles of ILs on the clean TiO2surfaces 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 TiO2surface with UV light treatment in air. In addition, the critical surface tension on the vacuum-annealed TiO2surface 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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