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| - Interaction of Poly(ethylenimine) with Perfluoro FattyAcid at the Air/Water Interface
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| - The effect of poly(ethylenimine) (PEI) dissolved in water on the surface pressure−area isotherm ofperfluorotetradecanoic acid (PFTDA) at the air/water interface was investigated. PEI was confirmed tostabilize the PFTDA monolayers over a wide range in pH such that the collapse pressure of the PFTDAmonolayer attained 70 mN/m upon interaction with PEI. The attenuated total reflectance IR spectroscopyrevealed that PFTDA and PEI could be cotransferred to a solid substrate in a Y-type at neutral to weaklybasic conditions and in a Z-type at highly basic conditions. From the frequency difference between theantisymmetric and symmetric stretching modes of the carboxylate group, the carboxylate group wasdemonstrated to interact ionically with PEI. These observations led us to propose an interaction schemefor PFTDA with PEI at the air/water interface. At higher pH, more PEI molecules should be present nearthe air/water interface for efficient interaction with the carboxylate group of PFTDA-. This is as if theheadgroup of PFTDA becomes bulkier and heavier upon increase in the solution pH.
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