Liquid Effects on Surface Charge Density

Ionic Liquid Effects on Surface Charge Density 

Both type of ions, cations and anions, are found at the interface and contribute to the surface charge density at the gas-liquid interface. The surface charge depends on the number density of cations and anions, which indicates, in general, high surface charge density at the interface itself as ionic liquids are composed of purely 

The surface potential at the interfacial layer is controlled by the surface excess of ions, their charges and polariTation, packing density, and dipole moment or induced dipole moment it can be determined by special techniques, that is, the vibrating plate method, combined with a Kelvin probe. Experimental data together with the most suitable prediction models may include the ion concentration in the bulk or ionic strength, and, when dealing with a monolayer, the ion number density in the monolayer, the monolayer thickness, and ion diameter. 

In conclusion, both cations and anions are located at the interface and contribute to the measured surface potential and charges. The high charge density found at the interfacial double layer is balanced by the ion distribution in the bulk to maintain overall electroneutrality. 

Electrical double layer EDI). Favorable electron-transfer capabilities make ionic hquids good conductive media and vahd substitutes for conventional electrolytes. Electrolytic properties of ionic hquids were studied to determine the capacitance-layer thickness relationship of the EDL by electrochemical impedance spectroscopy (EIS). EIS data combined with supporting SFG analysis indicate that the EDL formed by ionic hquids at the electrode-ioitic liquid interface follows the Helmholtz model and corresjtonds to a Helmholtz layer of one ion thickness [35,36]. 

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