Ordered Inorganic-Organic Composites

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Ordered Inorganic-Organic Composites Porous
Solids Interdisciplinary Materials Science
Engineering Opportunities Dr. Brad
Chmelka Department of Chemical Engineering
University of California Santa Barbara, CA
93106 Cal Poly, San Luis Obispo, January 23,
2002
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Biominerals Strong natural structural materials

• 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

T. Schäffer et al., Chem. Mater. 9, 1731 (1997)
Scanning electron micrograph
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Self-Assembled Inorganic-Organic Materials
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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

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Hexagonal SBA-15 uniform, tunable mesoporous
oxide arrays
4.7 nm
6.0 nm
SiO2
Al2O3
MnOx
26.0 nm
20.0 nm
TiO2
MoOx
ZrO2
CuOx
V2O5
ZnOx
SiAlO3.5
Ta2O5
CrOx
Si2AlO5.5
WO3
InOx
Al2TiO5
SnO2
SbOx
ZrTiO4
HfO2
CdOx

• Non-oxidic systems
• Semiconductors

SiTiO4
Ge2O3
NiOx
ZrW2O8
Nb2O5
ReOx
D. Zhao et al., Science, 279, 548 (1998) P. Yang
et al., Nature, 396, 152 (1998)
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Incorporation of Optical Functionalities
In transparent composites

• Organic Dyes
• Conjugated Polymers
• Organometallics
• DNA
• Semiconducting Quantum Dots
• Nanowires
• Inorganic Charge Transfer
• Rare Earth Complexes
• Enzymes, e.g., organophosphorus
• hydrolase

In transparent mesoporous solids
50 nm