Abstract
The surface potential vs. concentration curves of polyoxyethylene n-dodecanols and n-octadecanols in 0.001 M HCl solutions have been determined as a function of ethylene oxide chain length. From the combined surface potential and surface tension results the surface moments have been evaluated by the Helmholtz and Gibbs' equations. In both homologous series the surface moments increase with increasing length of the ethylene oxide chains, and the increments per ethylene oxide unit diminish with increasing length of the hydrophilic group. These results support the contention cited in Part I that the amphipathic molecules orient at the air/water interface with the hydrophobic groups above the interface and the ethylene oxide chains forming coils in the aqueous phase. In addition the effect of electrolyte concentration and pH on the surface potentials of nonylphenol + 15 EO has been determined. It is concluded that the ether oxygens in the ethylene oxide adducts form oxonium ions in analogy with monomeric ethers.
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