2007 Fiscal Year Final Research Report Summary
Electrochemical Control of Solution Viscoelasticity
| Project/Area Number |
17550137
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Functional materials chemistry
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| Research Institution | Tokyo University of Science |
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Principal Investigator |
ABE Masahiko Tokyo University of Science, Faculty of Sci. and Tech., Professor (40089371)
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| Project Period (FY) |
2005 – 2007
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| Keywords | Surfactant / Worm-like Micelle / Redox reaction / Ferrocene / Vicoelasticity / Transmission Electron Microscopy / Molecular Assembly / Electrochemistry |
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| Research Abstract |
A novel way of controlling fluid viscoelasticity using a "Faradaic (redox) reaction was studied. The system is based on a cationic redox-switchable ferrocenyl surfactant [(11-ferrocenylundecyl) trimethylammonium bromide, FTMA] that self-assembles into worm-like micelles in the presence of sodium salicylate (NaSal). The ferrocenyl group (reduced form) in the molecule is hydrophobic, while the ferricinium cation (oxidized form) acts as a hydrophilic moiety. This property gives remarkable change in the hydrophilic-lipophilic balance of FTMA, thereby changing its aggregation state.
An aqueous solution of mixed FTMA(reduced form) and NaSal exhibited a remarkable viscoelasticity. The viscoelastic behavior corresponded to a Maxwell-model and the zero shear viscosity was four orders of magnitude (15 Pass) higher that the viscosity of water (1x 10-3 Pass). Considerably elongated aggregates that are entangled with each other were observed on the FF-TEM micrograph. The high viscoelasticity observed for the mixed solution can therefore be ascribed to an entangled network of worm-like micelles.
This highly viscoelastic aqueous mixture was electrolyzed at +0.5 V vs. SCE. The viscosity of the system dramatically decreased and the elasticity disappeared after electric oxidation. The oxidized sample was a Newtoniam fluid and its viscosity had a value of 2.5x 10-3 Pass, which is about 1/6000 of the zero shear viscosity of the reduced sample. This remarkable viscoelasticity decrease is caused by a significant change in the aggregation state of FTMA and NaSal mixture from worm-like micelles to monomers and/or other smaller aggregates due to the enhanced hydrophilicity of FTMA. The method that we report are applicable to the controlled release of substances such as dyes and perfumes entrapped in an entangled network of worm-like micelles, ink for inkjet printers, flow rate controlling systems using electrical signals, clutches for transmission and valves.
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[Journal Article] Preparation and Characteristics of Arginine Oleate Liquid Crystal Holding a Large Amount of Water2007
Author(s)
K., Tsuchiya, J., Ishikake, T., -S., Kim, T., Ohkubo, H., Sakai, M., Abe
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Journal Title
Journal of Colloid and Interface Science 312
Pages: 139-145
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Preparation of nanocapsul es with alginate/polylysine complex wall2006
Author(s)
M., Abe, K., Tanaka, A., Nakayama, T., Kondo, K., Tsuchiya, V., Tantayakom, T., Ohkubo, H., Sakai
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Journal Title
Journal of Oleo Science 55(12)
Pages: 615-621
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Preparation of Inorganic Thin Films using a Micelle Disruption Method2005
Author(s)
H., Imamura, H., Yoshioka, S., Nakano, K., Tsuchiya, T., Ohkubo, S., Okabe, H., Sakai, Y., Nihei, M., Abe
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Journal Title
Material Technology 23(1)
Pages: 27-35
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Phase Behavior of Mixed Solutions of a Cat ionic Surfactant with a Ferrocenyl Group and an Anionic Surfactant : -Surface Chemical and Flertrnelipmir.al Annrnaches2005
Author(s)
H., Imamura, K., Tsucniya, Y., Kondo, N., Yosnino, T., Onkubo, H., SaKai, M., Abe
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Journal Title
Journal of Oleo Science 54(7)
Pages: 383-388
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Preparation of polyurea microcapsules using electrocapi nary emulsification techniaue2007
Author(s)
K., Tanaka, K., Sakai, H., Sakai, T., Kondo, M., Abe
Organizer
The 46th Annual Meeting, Japan Oil Chemists' Society
Place of Presentation
Kyoto
Year and Date
2007-09-08
Description
「研究成果報告書概要(欧文)」より
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