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High-resolution transmission electron microscope (TEM) images of a silicate SDA-templated glass (MBG) (top) and a “conventional” sol-gel glass (without SDA) (bottom). Mesopores in the mesoporous bioactive glass (MBG) are well ordered according to a hexagonal symmetry. A schematic representation of alendronate molecule and its interaction with silanol groups at the mesopore surface are also displayed. Pictures reproduced from Arcos and Vallet-Regi [16] with permission.
