Ion-Selective Marangoni Instability of Oil/Water Interface under a DC Voltage
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- Maki Syungo
- Department of Chemical Engineering and Materials Science, Doshisha University
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- Yamamoto Ryota
- Department of Chemical Engineering and Materials Science, Doshisha University
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- Yamamoto Daigo
- Department of Chemical Engineering and Materials Science, Doshisha University
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- Shioi Akihisa
- Department of Chemical Engineering and Materials Science, Doshisha University
Bibliographic Information
- Other Title
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- Selected Papers : Ion-Selective Marangoni Instability of Oil/Water Interface under a DC Voltage
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Abstract
Ion-selective Marangoni instability (MI) was studied by electrochemical measurements in order to determine the non-hydrodynamic nonlinear dynamics inherent to the process. An oil-soluble surfactant and calcium ion reacted at the interface, where the reaction products form aggregates. We generated a macroscopic interface where interfacial processes such as reaction and aggregation were synchronized. In this case, a non-hydrodynamic regime was observed before convection: Immediately after applying voltage, we observed an unsynchronized interface and an irregular interfacial flow. However, when the amount of ion transport across the interface exceeded a threshold value, the interface became synchronized, and successive occurrence of MI appeared as a periodical oscillation of interfacial tension. An aggregate of reaction products was considered to proceed homogeneously over the whole synchronized interface. We used a hemispherical droplet shape, and thus an increase in interfacial tension decreased the interfacial area. The interface was then compressed, providing a mechanical work for the desorption of aggregated products. This triggered a hydrodynamic instability.
Journal
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- Bulletin of the Chemical Society of Japan
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Bulletin of the Chemical Society of Japan 87 (8), 863-870, 2014
The Chemical Society of Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390001204141460608
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- NII Article ID
- 130004153309
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- NII Book ID
- AA00580132
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- ISSN
- 13480634
- 00092673
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- NDL BIB ID
- 025633225
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed