Evolution of calcite surfaces upon thermal decomposition, characterized by electrokinetics, in-situ XRD, and SEM

Prewetting Induced Hydrophilicity to Augment Photocatalytic Activity of Nanocalcite @ Polyester Fabric

“…Moreover, it was observed that surface roughness increased with the concentration in the basic solution used for pretreatment, indicating that the surface undergoes hydrolysis, which enhanced the surface hydrophilicity. Such effects of prewetting have been reported previously, which support the present results [53,55]. It can be seen that the as-fabricated surface looked very smooth compared to that of the pretreated one, which shows that the roughness was because of partial hydrolysis.…”

“…Moreover, on the basic pretreated surface, the fine kinks and grooves appeared due to significant erosion on the surface, which were distinguishable in micrograph (Figure 4c,d). This surface roughening effect leads to enhanced light-trapping phenomenon due to destructive interference [54,55]. The surface roughness of nanocalcite @ PF increased the surface area of the fabric due to basic prewetting due to the greater extent of surface erosion occurred compared to that caused by acidic prewetting.…”

Ca2+ Ions Decrease Adhesion between Two (104) Calcite Surfaces as Probed by Atomic Force Microscopy

“…In this asymmetrical surface configuration, the surface charge of PP affects the overall measured ζ, by making it more negative (the fractional contribution of PP to the overall determined ζ can be up to 0.5; however, the higher surface area due to calcite roughness generally lowers the contribution of PP to the overall ζ in an asymmetric surface configuration). 41 The ζ-potential of PP (with pZc = 4) is around −80 mV at high pH (8–9). 42 The measurements were performed in duplicates for each tested solution, and each data point in Figure 2 C corresponds to 12 measurements of ζ acquired within 45 min.…”

“…In this setup, the potential difference is generated by the movement of a liquid relative to a flat macroscopic calcite crystal, and the streaming potential-derived ζ was calculated as follows: where d U Str /dΔ p represents the streaming potential coupling coefficient [V·Pa –1 ], η is the dynamic viscosity of the electrolyte [Pa·s], ε is the electrolyte dielectric constant, ε o is the permittivity in a vacuum [F·m –1 ], and κ B is the conductivity of the bulk electrolyte solution [S·m –1 ]. We performed the measurements in a clamping cell attachment to facilitate the use of a large and brittle calcite (104) surface (which is additionally less reactive than small, micron-sized crushed aggregates), following the methodology by Ban et al The microchannel’s walls are made of the reference polypropylene (PP) surface, which opposes the studied calcite surface. In this asymmetrical surface configuration, the surface charge of PP affects the overall measured ζ, by making it more negative (the fractional contribution of PP to the overall determined ζ can be up to 0.5; however, the higher surface area due to calcite roughness generally lowers the contribution of PP to the overall ζ in an asymmetric surface configuration) .…”

“…We performed the measurements in a clamping cell attachment to facilitate the use of a large and brittle calcite (104) surface (which is additionally less reactive than small, micron-sized crushed aggregates), following the methodology by Ban et al The microchannel’s walls are made of the reference polypropylene (PP) surface, which opposes the studied calcite surface. In this asymmetrical surface configuration, the surface charge of PP affects the overall measured ζ, by making it more negative (the fractional contribution of PP to the overall determined ζ can be up to 0.5; however, the higher surface area due to calcite roughness generally lowers the contribution of PP to the overall ζ in an asymmetric surface configuration) . The ζ-potential of PP (with pZc = 4) is around −80 mV at high pH (8–9) .…”