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    Surface Potential of 1-Hexanol Solution: Comparison with Methyl Isobutyl Carbinol

    Year: 2013

    Journal: J. Phys. Chem. B, 2013, 117 (25), pp 7615–7620, 20131119

    Authors: Cuong V. Nguyen 1, Chi M. Phan *1, Ha M. Ang 1, Hiromichi Nakahara 2, Osamu Shibata 2, and Yoshikiyo Moroi

    Organizations: 1 Department of Chemical Engineering, Curtin University, Perth, Western Australia 6845, Australia, 2 Department of Biophysical Chemistry, Faculty of Pharmaceutical Sciences, Nagasaki International University, Sasebo, Nagasaki 859-3298, Japan

    Alcohols have an amphiphilic characteristic and are employed in industrial processes to enhance interfacial properties. In this study, the change in surface potential (ΔV) and surface tension of 1-hexanol were measured on the subsurface of electrolyte solutions (NaCl at 0.02, 0.2, and 2 M). The results were fitted by a newly proposed model, which includes the influence of electrolytes and surface concentration of surfactant at the air–water interface. The findings were compared to those of a previous study on methyl isobutyl carbinol (MIBC). Most significantly, the modeling results showed opposite behaviors between the two systems: adsorbed MIBC enhances the presence of cations, whereas adsorbed 1-hexanol enhances the presence of anions. The difference highlights the significance of the molecular structure on the arrangement at the air/water interface.