Second-harmonic generation at liquid-liquid interface

Daniel A. Higgins; Robert M. Corn

doi:10.1117/12.148508

2 July 1993 Second-harmonic generation at liquid-liquid interface

Daniel A. Higgins, Robert M. Corn

Proceedings Volume 1857, Lasers and Optics for Surface Analysis; (1993) https://doi.org/10.1117/12.148508
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

The technique of optical second harmonic generation (SHG) is applied to the measurement of molecular adsorption at the interface between two immiscible electrolyte solutions (ITIES). The resonant second harmonic response from 2-(N-octadecyl)aminonaphthalene-6-sulfonate (ONS) is used in conjunction with interfacial tension measurements to optically determine the relatively surface coverage of the anionic surfactant molecule at a charged water- dichloroethane interface. At a pH of 9, ONS adsorption occurs at all potentials positive of the potential of zero charge. The potential dependent adsorption of ONS can be described by a Frumkin isotherm with a free energy of adsorption that varies linearly with applied potential. The potential dependence of the SHG from the interface provides important information on the position of the adsorbed ONS molecules with respect to the ITIES. At a pH of 3, both the anionic form of ONS and the protonated zwitterionic form of ONS are present at the liquid- liquid interface.

Citation Download Citation

Daniel A. Higgins and Robert M. Corn "Second-harmonic generation at liquid-liquid interface", Proc. SPIE 1857, Lasers and Optics for Surface Analysis, (2 July 1993); https://doi.org/10.1117/12.148508

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