Materials with periodically arranged mesopores

In the last decades, templating schemes toward materials with a uniform meso-or macropore size distribution and an ordered pore arrangement of the pores 

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Control over the material s shape at the nanoscale enables further control over reactants access to the dopant, and ultimately affords a potent means of controlling function which is analogous to that parsimoniously employed by Nature to synthesize materials with myriad function with a surprisingly low number of material s building blocks. A nice illustration is offered by the extrusion catalytic polymerization of ethylene within the hexagonal channels of MCM-41 mesoporous silica doped with catalyst titanocene.36 The structure is made of amorphous silica walls spatially arranged into periodic arrays with high surface area (up to 1400 m2g 1) and mesopore volume >0.7 mLg-1. In this case, restricted conformation dictates polymerization the pore diameter... 

The introduction of organic groups within the framework of the mesoporous material has improved the periodicity of the pore-arrangement with the symmetries. Figure 4 shows the XRD patterns of the three types of mesoporous materials with 2D-hexagonal symmetry (p6mm). 

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