ordered inorganic-organic composites & porous solids: interdisciplinary materials science &...
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Ordered Inorganic-Organic Composites & Porous Solids:
Interdisciplinary Materials Science & Engineering Opportunities
Dr. Brad ChmelkaDepartment of Chemical Engineering
University of CaliforniaSanta Barbara, CA 93106
Cal Poly, San Luis Obispo, January 23, 2002
Biominerals: Strong natural structural materials
T. Schäffer et al., Chem. Mater. 9, 1731 (1997) Scanning electron micrograph
• Oriented single crystals of CaCO3
• Shell exterior: 99% calcite 1% organic
1000 times stronger than polycrystalline CaCO3
• Interior nacre: 99% aragonite 1% organic
mother-of-pearl
Abalone shell: Protein-directed crystallization
Self-Assembled Inorganic-Organic
Materials
Nanoscopic, 10-9 m
Mesoscopic
Microscopic, 10-6 m
Macroscopic
New Technology Opportunities & Applications
Functionalized Porous Powders and Fibers
catalysts, separation & filtration media, adsorbents
Films and Coatings
functional membranes, barriers, packaging, fuel cells
Electronic Materials
low-dielectric-constant films and monoliths
Optical Materials
lasers, waveguides, optical limiters, optical interconnects,
photonic crystals
Sensors
chemical and biosensors
SBA-15
20 nm 20 nm
30 nm 25 nm
4.7 nm 6.0 nm
20.0 nm 26.0 nm
D. Zhao et al., Science, 279, 548 (1998)P. Yang et al., Nature, 396, 152 (1998)
SiAlO3.5
Si2AlO5.5
Al2TiO5
ZrTiO4
SiTiO4
ZrW2O8
ZrO2
TiO2
Nb2O5
Ta2O5
WO3
SnO2
HfO2
Al2O3
SiO2
Ge2O3
V2O5 ZnOx
CdOx
InOx
SbOx
MoOx
ReOx
NiOx
MnOx
CrOx
CuOx
• Non-oxidic systems
• Semiconductors
Hexagonal SBA-15: uniform, tunable mesoporous oxide arrays
50 nm
Incorporation of Optical Functionalities
• Organic Dyes
• Conjugated Polymers
• Organometallics
• DNA
• Semiconducting Quantum Dots
• Nanowires
• Inorganic Charge Transfer
• Rare Earth Complexes
• Enzymes, e.g., organophosphorus
hydrolase
N NO2O
In transparent mesoporous solids
In transparent composites