Figure 2.

TEM images. (a) KIT-6 (calcined), (b) Ti-KIT-6 (calcined, Si/Ti = 200), (c) Ti-KIT-6 (calcined, Si/Ti = 100), and (d) Ti-KIT-6 (calcined, Si/Ti = 50). The blue arrow shows the preserved meso-structure. The red arrow indicates the partial collapse of the mesoporous structure.

Akhter et al. Nanoscale Research Letters 2014 9:158   doi:10.1186/1556-276X-9-158
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