1991 Fiscal Year Final Research Report Summary
Self Organization into Bilayer of Fluorocarbon Amphiphiles in Aromatic and Aliphatic Solvent
| Project/Area Number |
02453109
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
高分子合成
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| Research Institution | Kyushu University |
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Principal Investigator |
KUNITAKE Toyoki Kyushu University, Faculty of Engineering Professor, 工学部, 教授 (40037734)
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| Co-Investigator(Kenkyū-buntansha) |
ANDO Reiko Kyushu University, Faculty of Engineering Research Assistant, 工学部, 教務員
ISHIKAWA Yuichi Kyushu University, Faculty of Engineering Associate Professor, 工学部, 助教授 (30184500)
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| Project Period (FY) |
1990 – 1991
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| Keywords | bilayer membrane / amphiphilic compound / interfacial momolayer / fiqorocarbon / molecular assembly / surface tension |
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| Research Abstract |
In this project, we extended the concept of self-organizing bilayer formation from aqueous systems to non-aqueous systems, and established the molecular design of the component amphiphile. Novel amphiphilic compounds which contain two fluorocarbon chains as solvophobic unit and flexible oleyl chain as solvophilic unit underwent self-organization in hydrocarbon meflia to bilayer assemblies similar to those in aqueous media. Electron microscopy displayed their varied morphologies. These amphiphiles commonly contained the amide connector that promoted intermolecular attraction. Infrared spectroscopy showed that the amide bond shifted to a shorter wavenumbers in chlorocyclohexane in which the bilayer was formed. This shift was lost above the phase transition temperature as determined by differentialscanning calorimetry (DSC). The IR data also showed that the fluorocarbon chain assumed a helical conformation at 15ﾟC and a zig-zag conformation at 40ﾟC. This conformational change was associated with the bilayer formation. The monolayer formation was observed at the air-chlorocyplohexane interface. The molecular cross-section agreed with that of the fluorocarbon chain, indicating the presence of a condensed monolayer. The thermodynamic changes of the surface adsorption agreed with those obtained for the dispersed bilayer by DSC. Therefore, the phase transition of the dispersed bilayer must occur between the monomeric dispersion and the bilayer, unlike those of aqueous bilayers. In conclusion, molecular design of non-aqueous bilayers needs to be based on long fluorocarbon chains, effective intermolecular interactions such as hydrogen bonding and dipolar attraction, and enhanced solvophilicity.
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Research Products
(6 results)
