Green Nanoparticles by Unknown

Author:Unknown
Language: eng
Format: epub
ISBN: 9783030392468
Publisher: Springer International Publishing

The distribution of the electrolyte ions can be described by using Gouy-Chapman model (Bard et al. 1980). According to this model, electrical double layer is formed at the surface which contains a diffuse charge region and Stern inner layer. The diffuse charge region consists of the non-specifically absorbed ions which behave as an ionic cloud and are balanced by the uncompensated surface sites. Inner layer contains two planes, namely, inner Helmholtz plane (IHP) and outer Helmholtz plane (OHP). The first plane (IHP) is the position of the centres of the specifically adsorbed ions. The second plane (OHP) is the position of the centres of the hydrated ions with the closest approach to the solid. Therefore, the electrical double layer behaves as two capacitors diffused layer capacitance and Helmholtz capacitance. These two layers determine or even modulate the potential gradient across the solution, leading to varied currents. The higher the amount of H+ ions in the solution, the thicker the charge diffusion layer, and the faster the charge diffusion layer is formed, leading to larger current values. The focus was on the surface/electrolyte interface (Yang 2012).

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