Adsorption behavior of lauric acid at heptane/water interface as studied by second harmonic generation spectroscopy and interfacial tensiometry

Akira Yamaguchi, Tatsuya Uchida, Kimihisa Nochi, Tomohisa Yamashita, Norio Teramae

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Interfacial tensiometry and second harmonic generation (SHG) spectroscopy were applied to examine the adsorption behavior of lauric acid (LA) at a heptane/water interface. From interfacial tensiometry measurements, the adsorption kinetics of LA was revealed to be diffusion-controlled, and the adsorption constant of LA was estimated to be 9.6 × 104 M -1. The adsorption isotherms obtained by SHG measurements were analyzed by taking account of both the molecular orientation of LA at the interface and a surface electric field generated by the adsorbed LA layer. It was confirmed that the carboxylic groups of adsorbed LA molecules were well ordered at the heptane/water interface and the orientation of the carboxylate group was invariant during the adsorption process.

Original languageEnglish
Pages (from-to)1523-1527
Number of pages5
JournalAnalytical Sciences
Volume20
Issue number11
DOIs
Publication statusPublished - 2004 Nov

ASJC Scopus subject areas

  • Analytical Chemistry

Fingerprint Dive into the research topics of 'Adsorption behavior of lauric acid at heptane/water interface as studied by second harmonic generation spectroscopy and interfacial tensiometry'. Together they form a unique fingerprint.

  • Cite this