Monitoring of molecular behavior of a chemical oscillation system at a liquid/liquid interface using a time-resolved quasi-elastic laser scattering method

Abstract

A time-resolved quasi-elastic laser scattering (QELS) technique was applied to monitor the molecular number density at a water/nitrobenzene (W/NB) interface of a W–NB–W three phase chemical oscillation system. We successfully monitored the oscillations of interfacial molecular number density, electric potential, and turbidity simultaneously by a newly developed chemical oscillation — QELS combination system. We observed for the first time that monolayer of the surfactants covers the interface almost throughout the oscillation and that the oscillation occurs simultaneously with a catastrophic disintegration of the monolayer after the increase of molecular number density. We proposed a new model for the chemical oscillation based on the obtained molecular description.