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The yellow region represents the positive surface potential values, and the blue region represents the negative potential values.
Surface potential values in the head region of the propagating filaments were found to be 200 mV lower than the interface between intact plasma polymer and the aluminium alloy, indicating the active region.
On the other hand, the surface potential values in the trailing filament tail are found to be about 250 mV higher than background, pointing out the cathodic site and superpassivation due to the accumulated corrosion products in this region.
The surface potential values are superimposed on the topographic data in Figure 3c and the scanning position at which the UV illumination was turned on is indicated.
The equilibrium surface potential under UV illumination was found to be larger for the ZnO N films than for the undoped films (a version of Figure 3b in which the pre-illumination surface potential values have not been normalized to zero is shown in Section S4 of the Supporting Information).
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The surface zeta potential values of Ag-NPs (Figs. 1d, 2d) were measured to be slightly negative and were −20.4 mV for EnAg-NPs and −19.9 mV for AfAg-NPs.
Furthermore, zeta potential measurements (Table 1) showed that after surface modification of HNTs, the surface zeta potential value dramatically changed from -14.3 mV to +44.8 mV.
The basic characteristics of four types of zeolites such as structure, Si/Al ratio, particle size, surface area, external surface area and zeta potential values are presented in Table 1.
Irrespective of the original surface charge, serum proteins adsorbed onto the surface, neutralized the zeta potential values, and prevented the aggregation of the tailor-made FFSNPs.
Contact angles, surface tension parameters, zeta potential values and microalgal removal percentages were analysed using paired-samples t-test from the statistical software SPSS 22.0 (SPSS Inc., Chicago, IL, USA).
Zeta potential measurements indicate that although the pyrite surface was negatively charged under a wide pH range in the absence of Cr VI), it behaved more like a "metal oxide" surface with the surface potential shifting from positive to negative values at pH values > pH 6 in the presence of Cr VI).
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