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Department of Nuclear Methods > Research > Porous structures

Porous structures


MCM-41
The ordered mesoporous materials (OMM) have been synthetized for the first time by the group from Mobil Oil at 1992 [1]. The class of OMM are MCM-41 materials, which are characterized by:
  • uniform pore diameter,
  • large pore volume,
  • large surface area.
Their structure consists of hexagonal arrangement of the cylindrical pores.


Synthesis of MCM-41 is made by use of templating technique. Commonly used alkyl-trimethylammonium template forms cylindrical micelles in alkaline medium. Silica from tetraethylorthosilicate (TEOS), or alkalimetal silicate, is condensed around organic agglomerates, which leads to creation of micelle-templated silica (MTS). The channel diameter of MCM-41 can be controlled by using the templates with alkyl chains of different length. Obtained pore diameters are 2 to 10 nm. After MTS formation, according to standard procedure, template is removed by pyrolysis at 820 K.

[1] C.T. Kresge, M.E. Leonowicz, W.J. Roth, J.C. Vartuli, J.S. Beck: Nature 359 (1992) 710.

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