| Budget Amount *help |
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2001: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2000: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1999: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Research Abstract |
The unique type metal complex surfactants having double alkyl chains have been prepared, isolated, and characterized. They contain zinc, cadmium, palladium, platinum, or silver as a central metal. The aggregation behavior of these metal complex surfactants have been studied using ^1H NMR self-diffusion, vapor pressure depression, electric conductivities, ion-selective electrode, and multinuclear NMR spectroscopies. It is characteristic that the metal complex surfactants tend to form reverse micellar solutions in water/organic solvent of low polarity and the water pools in the reverse micellar system include high concentrations of metal ions. The solubilities of the metal complex surfactants in various solvents and dynamic properties (self-diffusions, electric conductivities, and viscosities) of the reverse micelles largely depend on the ionicity/covalency ratios of the metal-counterion interactions. These physical properties of the solutions were correlated with the structures of the aggregation solutions measured by a transmission electron microscopy of freeze-fracture method. It has been revealed that metal complex surfactants are favorable to systematically investigate the aggregation behavior of amphiphilic molecules since we can widely vary the hydrophilic-lipophilic balance by changing the ligands and the metals.
Furthermore, we have tried to prepare metal hano particles for silver and palladium by reduction of the headgroup metals in the reverse micellar systems of metal complex surfactants. The reverse micellar systems of metal complex surfactants are favorable to prepare metal nano particles in high yield since metal ions are highly concentrated in the water pools in the micellar systems. We have studied a relationship between the particle-size distributions or shapes of metal nano particles and the structures of the reverse micelles or the W/0 microemulsions.
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