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The diffuse layer potential values ψd calculated according to the Gouy Chapman Grahame (GCG) model have been used for the construction of the corrected Tafel plots, which were linear in the limited region of negative potentials (−1.35 V ≤ (E−ψd) ≤ −1.15 V versus Hg|Hg2Cl2|4 M KCl) giving the apparent transfer coefficient value αapp≈0.35 for 1×10−3 M KF solution.
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However, for thicker Pt layers, zeta potential values of non-annealed and annealed samples are almost the same.
For thinner Pt layers, zeta potential values of annealed samples are quite higher due to increasing surface roughness and morphology and a partially uncovered polymer surface (see Figure 3) in comparison with those of non-annealed samples.
The grain size increase with increasing NaF layer and the potential value is also enhanced.
In the pH range of 3 4, a smaller amount of amino groups in the colloidal particle diffusion layer (come from LYS 4,900 molecules) contributes to the fact that less negatively charged counter-ions are displaced from the Stern layer, and therefore, the higher zeta potential values are obtained for LYS 33,000.
Hydrogen adsorption and desorption peaks as well as a short double layer charging region are observed at intermediate potential values.
Mott Schottky diagrams recorded on both materials under conditions of electrolysis in the absence of microorganisms showed that the surface oxide layers had similar n-type semi-conductive behaviour for potential values higher than the flat band potential.
Their zeta potential values ranged from less than −30 mV for the ones with external polyanion layers through −4 mV for the PEG-ylated layers to more than 30 mV for the polycation layers.
The observed increase in the zeta potential values may be explained by the presence of the positively charged functional groups present in the Cr2O3 diffusion layer.
Zeta potential values measured for uncoated SPIONs in different suspension vehicles demonstrated a dramatic impact of charged buffer ions on the diffuse layer capacitance.
At higher potential values the electrochemical oxidation of this complex results bromo-c-hexanol, the formation of which is hindered by oxide layer on the electrode surface.
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