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Fig. 4.6 a
Photographs of as-synthesized periodic mesoporous titanium phosphonate materials
and the final monolithic product after surfactant removal by extraction,
b
,
c
corresponding TEM
images. Reprinted with permission from Ref. [
21
]. Copyright 2010, Royal Society of Chemistry
The main challenges in the preparation of mesoporous monolith materials can
be associated with the following points:
Firstly, prevention of cracking. There are two interfaces, gas/liquid (solid) and
liquid (solid)/solid (substrate or container) interfaces in the preparation, whose dif-
ferent contraction coefficients often result in cracking of the monolith.
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