2014 Fiscal Year Final Research Report
Surfactant molecules behaving as surface-inactive agents
| Project/Area Number |
25800241
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Biological physics/Chemical physics/Soft matter physics
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| Research Institution | Ritsumeikan University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Keywords | 自己組織化 / 溶媒和 / コロイド / 相分離 / 中性子散乱 |
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| Outline of Final Research Achievements |
It is well-known that surfactant molecules adsorb at the interface between water and oil, and the mutual solubility of water and oil increases since the interfacial tension decreases. However, we recently discovered that the mutual solubility of water and 2,6-dimethylpyridine or acetonitrile decreases when non-ionic surfactant, C12E5, is dissolved. That is, C12E5 behaves as "surface-inactive" agents in these mixtures.
In order to clarify the origin of this phenomena, we performed small-angle neutron scattering (SANS) experiment on a mixture of water / 2,6-dimethylpyridine / C12E5 or water / acetonitrile / C12E5. The SANS data suggested that membrane structures composed of C12E5, i.e., bilayer structures or micelle structures, are formed in mixtures. These memranes should preferentially attract water molecules, and this results in the decrease of the mutual solubility of water and organic solvent.
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| Free Research Field |
ソフトマター物理学、溶液化学
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