Hydrophilicity of Nonanoic Acid and Its Conjugate Base at the Air/Water Interface | Zendy

Shiva Badban | Zendy; Anita Hyde | Zendy; Chi M. Phan | Zendy

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Hydrophilicity of Nonanoic Acid and Its Conjugate Base at the Air/Water Interface

Author(s) -

Shiva Badban,

Anita Hyde,

Chi M. Phan

Publication year - 2017

Publication title -

acs omega

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.779

H-Index - 40

ISSN - 2470-1343

DOI - 10.1021/acsomega.7b00960

Subject(s) - conjugate , interface (matter) , base (topology) , chemistry , materials science , adsorption , organic chemistry , mathematics , mathematical analysis , gibbs isotherm

A general adsorption model based on partial dissociation was developed for carboxylic acids. The model was applied to the adsorption of nonanoic acid at the air/water interface. Two cases were selected for experimental verification: acid-only and acid with a constant Na + OH - concentration. The model was applied simultaneously at both conditions, and the hydrophilicity of the ionic states was quantified by the adsorption constants, K A and K AH . It was found that the adsorption constant for the acidic group is significantly higher than that for the carboxylate group, K AH /K A ∼ 272. The model lays important groundwork for modeling and predicting carboxylic/carboxylate adsorption.

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