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Volumn , Issue 21, 2000, Pages 3989-3998

Biologically inspired polyoxometalate-surfactant composite materials. Investigations on the structures of discrete, surfactantencapsulated clusters, monolayers, and Langmuir-Blodgett films of (DODA)40(NH4)2[(H20)n ∩ Mo132O372(CH3CO2) 30(H2O)72]

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Indexed keywords


EID: 33746965617     PISSN: 1470479X     EISSN: None     Source Type: Journal    
DOI: 10.1039/b003331f     Document Type: Article
Times cited : (179)

References (51)
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    • The surfactant shells of neighboring SECs in the film can penetrate each other, thus leading to an apparently smaller diameter as compared with a molecular model of an isolated discrete SEC. j
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    • The molecular area per DODAJBr at film collapse (48 mN m', l 20 °C) was determined to be 0.54 nm2 per molecule. On an aqueous subphase containing [(H2O), <= Mo,32Oj72(CHjCO2)ju(H2O)72]42- at a concentration of 1 umol L' the collapse area is similar (0.55 nm2 per molecule).
    • The molecular area per [DODAJBr at film collapse (48 mN m', l 20 °C) was determined to be 0.54 nm2 per molecule. On an aqueous subphase containing [(H2O), <= Mo,32Oj72(CHjCO2)ju(H2O)72]42- at a concentration of 1 umol L' the collapse area is similar (0.55 nm2 per molecule).
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    • Differential scanning calorimetry (DSC) shows an endothermic phase transition at 10-15 °C, attributed to alkyl chain melting, and an exothermic one at 4015 °C, which has not been assigned yet. A more detailed analysis of the Langmuir monolayer phase behavior ; will be presented elsewhere. '
    • Differential scanning calorimetry (DSC) shows an endothermic phase transition at 10-15 °C, attributed to alkyl chain melting, and an exothermic one at 4015 °C, which has not been assigned yet. A more detailed analysis of the Langmuir monolayer phase behavior ; will be presented elsewhere. '
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    • Structural reorganization has been proposed for dendrimers at the air-water interface. See for instance: P. M. Saville, P. A. Reynolds, L. W. White, C. J. Hawker, J. M. J Fréchet, K. L. Wooley, J. Penfold and J. R. P. Webster, J. Phys. Chem., 1995, 99, 8283; A. H. J. Schenning, C. Elissen-Roman, J.-W. Wcener, M. W. P. L. Baars, S. J. van der Gaast and E. W. Meijer, J. Am. Chem. Soc., 1998, 120, 8199.
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    • In general, hydrophobic compounds do not spread at the air-water interface but aggregate and float as droplets or lenses on the water surface. Amphiphilic compounds that spread at the air-water interface have polar or charged groups that interact with the water molecules. A. W. Adamson and A. P. Gast, Physical chemistry of surfaces, 6th edn., Wiley, New York, 1997.
    • In general, hydrophobic compounds do not spread at the air-water interface but aggregate and float as droplets or lenses on the water surface. Amphiphilic compounds that spread at the air-water interface have polar or charged groups that interact with the water molecules. A. W. Adamson and A. P. Gast, Physical chemistry of surfaces, 6th edn., Wiley, New York, 1997.
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    • The hydrophobic nature of the SECs is demonstrated by its high solubility in apolar organic solvents and its wetting behavior. There are only few literature examples of hydrophobic molecules that form stable and reproducible Langmuir monolayers. See for instance: T. Pfohl, H. Möhwald and H. Riegler, Langmuir, 1998,14, 5285;
    • The hydrophobic nature of the SECs is demonstrated by its high solubility in apolar organic solvents and its wetting behavior. There are only few literature examples of hydrophobic molecules that form stable and reproducible Langmuir monolayers. See for instance: T. Pfohl, H. Möhwald and H. Riegler, Langmuir, 1998,14, 5285;


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