change in their shapewhich indicated that they had sphericalmorphology.
The determined-field image at highmagnification of theMCM-41/
TMSPDETA showed a lamellar mesostructure with a well-defined hexagonal
arrangement of uniform pores. The pore size was estimated to
be ~3.4 nm. These calculations are in good agreement with the calculations
from the BJH model. A detailed image was obtained by focusing a
direct electron beam parallel to the main axis of the pores.