2016 Fiscal Year Final Research Report
Characterization of solid surfaces by ionic liquid contact angle measurement in high-vacuum
| Project/Area Number |
15K13613
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Physical chemistry
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Keywords | 接触角 / イオン液体 / 真空 |
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| Outline of Final Research Achievements |
In order to understand the intrinsic state of solid surfaces via liquid contact angle measurement by excluding the extrinsic effects such as surface contamination, a high-vacuum contact angle measurement system connected to a sample preparation chamber was developed. The contact angle of non-volatile ionic liquids (ILs) on TiO2 single crystal surfaces and organic thin films prepared in vacuum was evaluated without air exposure. Our findings can be summarized as follows: (1) airborne contaminations change the ILs contact angle significantly; (2) the interaction between IL and TiO2 depends on hydrophilic/hydrophobic nature of ILs; (3) the coverage and number of molecular layers of an organic thin film can be estimated by the IL contact angle. These results suggest that a simple contact angle measurement in vacuum using ILs as probe fluids would allow us to investigate the intrinsic surface state of solids.
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| Free Research Field |
薄膜
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