We study the interfacial organization and the inherent electric field from aqueous solution surfaces.  Alkaline earth, alkali metal and ferric halides, nitrates, and sulfates organize in the interfacial region distinctly differently and their respective surface potentials are reflective of the preference or non-preference for the aqueous surface.  Soluble and insoluble organics also modify the interfacial electric field through organization to minimize the free energy of the surface.  These effects impact binding of ions with organic molecules and thus modify the surface electric field.  Experimental studies of sum frequency generation, second harmonic, infrared reflection, ionizing surface potential and surface tension measurements will be presented for a unifying picture of aqueous salt and organic rich interfaces.

Interfacial aqueous organization and electric fields generated from chemical composition: Environmental and material surfaces

ACS Fall 2021

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