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Fig. 8.


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AFM height images of calcite crystals: a) Untreated calcite; b) Silane treated calcite; C) ZrO2 modified; d) NiO modified (Nwidee et al., 2017). The different colors indicate variation in height of the surface with high Z-values (higher features appearing as white) and low Z-values (lower features appearing as dark shades).

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