Page 107 - Handbook of Surface Improvement and Modification
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102 Surface Tension and Wetting
Figure 7.7. SEM and AFM images of the films calcinated under (a) 225, (b) 300 and (c) 600°C. [Adapted, by
permission, from Fan, X; Zheng, L; Cheng, J; Xu, S; Wen, X; Cai, Z; Pi, P; Yang, Z, Surf. Coat. Technol., 213,
90-7, 2012.]
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phobic to superhydrophilic along with the increased calcination temperature. Figure 7.6a
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shows synthesis of composite microspheres and 7.6b method of gradient formation. The
physical topography of surface changed gradually from spike-type into pore-type and the
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main chemical compositions changed from polystyrene to silica (Figure 7.7). The PS
spheres first melted, then shrank, and finally decomposed to form pores with silica on the
