Mesoporous material Mesoporous 2-50nmMCM-41 (MCM stands for
Mobil composite of matter) MCM-48 and SBA-15 (SBA stands for
University of California, Santa Barbara)Based on the diffraction
characteristics, porous materials may be divided into three types:
amorphous, sub-crystal, and crystal. amorphous solid does not give
any diffraction peakssub-crystal gives no diffraction peaks or very
few broad diffraction peakscrystalline solid can produce a set of
characteristic diffraction peaks which correspond to its
crystallographic system and symmetry. macroporous
materials,ceramics and cement - irregular pores and wide pore-size
distribution.MCM 41MCM 48 SBA 15
propertieswell defined pore sizes and shape, narrow pore-size
distribution;highly ordered pore (or channel) structure system at
the nanometer level;adjustable pore size in the range of 1:3 to 30
nm;various structures, wall compositions, and pore shapes;high
thermal and hydrothermal stability if properly prepared or
treated;high surface area, large pore volume various controllable
regular morphologies at different scale from nanometers to
micrometers;
control the mesostructures change various reactant
concentrations, reaction temperature, and reaction-mixture
composition;adjust the surfactant effective-packing parameter, g by
using different structured surfactants, adding additives, or
changing synthesis conditions.
MCM- 41adjustable in the range of 1.510 nm and 4.0 nmhexagonal
or cylindrical?
Porous HostGuest assembley zeolites with encapsulated metal
clusters or metal ion clusters, and occasionally in the clusters
there are nonmetal ligands such as carbonyl groups. Zeolites with
dye moleculesPolymers or carbons such as fullerenes and carbon
nanotubes in zeolitic materialsInorganic semiconductor particles in
zeolitesMetal -complex-encapsulating zeolites. Thank you
