Surface potential of the air/water interface
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© 2020 by Japan Oil Chemists’ Society. The surface charge/surface potential of the air/water interface plays a key role in many natural and industrial processes. Since the first decade of the 20th century, there are many theoretical proposals to describe the surface charge in the presence of different moieties. However, a complete and consistent description of the interfacial layer remains elusive. More recently, the theoretical frameworks and experimental data get complementary support from the simulation at a molecular level. This paper reviews the recent developments from the theoretical, experimental and simulation aspects. The combined results indicated that the interaction between hydration shells of adsorbed ions and the H-bonds network of surface water plays a critical role in the ionic adsorption. The factor should be incorporated into the conventional theories to correctly predict the ion distribution near the air/water surface.
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Nguyen, C.V.; Nakahara, H.; Shibata, O.; Phan, Chi (2020)© 2019 Elsevier B.V. The change in surface potential was measured for NaI solutions. The modelled surface charge was then calculated and compared with molecular simulations. It was found that I− was enhanced at the ...
Phan, Chi; Nakahara, H.; Shibata, O.; Moroi, Y.; Thu, Le; Ang, Ha Ming (2012)The surface potential (ΔV) and surface tension (γ) of MIBC (methyl isobutyl carbinol) were measured on the subphase of pure water and electrolyte solutions (NaCl at 0.02 and 2 M). In contrast to ionic surfactants, it was ...
Phan, Chi (2018)Some surfactants, or surface-active agents, undergo ionization in water. The degree of ionization can affect molecular hydrophilicity and therefore the overall adsorption of surfactants at liquid surfaces. For weak ionic ...