Issue 43, 2017

The behavior of hydroxide and hydronium ions at the hexadecane–water interface studied with second harmonic generation and zeta potential measurements

Abstract

By probing the electric potential at the hexadecane–water interface with second harmonic generation and the zeta potential at the surface of a hexadecane droplet in its emulsion, we show that hydronium ions don't have a specific affinity to the oil–water interface although hydroxide ions do. The observed apparent affinity of the hydronium ions to the hexadecane–water interface is more likely a result of the electro-static attraction effect. The adsorption free energy of the hydroxide ions at the oil–water interface was estimated to be −8.3 kcal mol−1. This study provides more experimental evidence for understanding the behavior of hydronium and hydoxide ions at the oil–water interface.

Graphical abstract: The behavior of hydroxide and hydronium ions at the hexadecane–water interface studied with second harmonic generation and zeta potential measurements

Supplementary files

Article information

Article type
Paper
Submitted
25 Apr 2017
Accepted
27 Sep 2017
First published
28 Sep 2017

Soft Matter, 2017,13, 7962-7968

The behavior of hydroxide and hydronium ions at the hexadecane–water interface studied with second harmonic generation and zeta potential measurements

W. Gan, W. Wu, F. Yang, D. Hu, H. Fang, Z. Lan and Q. Yuan, Soft Matter, 2017, 13, 7962 DOI: 10.1039/C7SM00813A

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