1. MESOCHEMISTRY
SYNTHESIS IN “INTERMEDIATE” DIMENSIONS
Geoffrey A. Ozin
Materials Chemistry Research Group
University of Toronto
CHEM 1270H: TOPICS IN
INORGANIC CHEMISTRY
Tel: 416 978 2082, Fax: 416 971 2011
E-mail: gozin@chem.utoronto.ca
Group web-page: www.chem.toronto.edu/staff/GAO/group.html
2.
3. MESOCHEMISTRY
SYNTHESIS IN “INTERMEDIATE” DIMENSIONS
• Purpose of the four lectures
• Introduce key physicochemical design principles that
underpin the template directed synthesis of inorganic
mesoporous materials
• Focus on synthetic control of structure, composition and
form
• Appreciate how the properties of materials fashioned at
this intermediate length scale can be orchestrated to create
a purposeful function directed to a specific field of use.
7. ESCAPE FROM 10 Å PRISON
• Discovery by Mobil
researchers that an assembly
of surfactant molecules could
function as a supramolecular
template for organizing and
polymerizing silicates
• Produced the first fully
characterized examples of
periodic hexagonal and cubic
forms of mesoporous silica
with pore diameters 2-10 nm
• Integration of surfactant and
sol-gel chemistry
24. CUBIC BICONTINUOUS MESOPOROUS SILICA
Equipotential minimal energy surface
Cubooctahedral morphology
TEM image cubic mesoporous structure
Mesocrystalline glass –
crystalline mesoporosity
- periodic arrangement
of mesopores – glassy
walls - long range order
at mesoscale – short
range order at
microscale
25. WHAT CAN WE DO WITH PMS MATERIALS?
HOST-GUEST INCLUSION WITH LARGE GUESTS !!!
30. PHOTOCHEMICAL SWITCH
PORE SIZE CONTROL
Synthesis of films bearing photosensitive azobenzene units: 4-(3-triethoxysilyl-
propylureido) azobenzene by the coupling of triethoxysilylpropylisocyanate with 4-
phenylazoaniline used as organosilane precursor in co-condensation reaction
31. Periodic mesoporous silica with channel walls functionalized with terminally bound
alkanethiol groups that chelate and sequester toxic heavy metals.
HEAVY METAL SPONGE
