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- W1967432868 abstract "The surface density and electrolyte concentration dependences of the pKa of CH3(CH2)21NH3+ at the air/water interface are obtained using the method of second harmonic generation. If it is assumed that the amphiphiles are uniformly distributed at the interface, the application of the Gouy−Chapman model yields pKa values ranging from 10.2 to 8.2 as the interface density varies from 100 to 22 Å2/molecule. By accounting for the inhomogeneity of the interface, i.e., there are amphiphiles islands of “liquid phase” density immersed in a “gas phase” of very low-density amphiphiles, a single pKa of 10.1 ± 0.2 is obtained at all interface densities. The acidity of the long chain amine is enhanced by 3 times at the air/water interface compared with the bulk aqueous solution." @default.
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- W1967432868 date "2000-08-24" @default.
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- W1967432868 title "Effects of Monolayer Density and Bulk Ionic Strength on Acid−Base Equilibria at the Air/Water Interface" @default.
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- W1967432868 doi "https://doi.org/10.1021/jp0018091" @default.
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